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< Page ,Total 46 >
Modeling of single film bubble and numerical study of the plateau structure in foam system EI SCIE Scopus CSCD
期刊论文 | 2018 , 30 (1) , 79-86 | JOURNAL OF HYDRODYNAMICS
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Abstract :

The single-film bubble has a special geometry with a certain amount of gas shrouded by a thin layer of liquid film under the surface tension force both on the inside and outside surfaces of the bubble. Based on the mesh-less moving particle semi-implicit (MPS) method, a single-film double-gas-liquid-interface surface tension (SDST) model is established for the single-film bubble, which characteristically has totally two gas-liquid interfaces on both sides of the film. Within this framework, the conventional surface free energy surface tension model is improved by using a higher order potential energy equation between particles, and the modification results in higher accuracy and better symmetry properties. The complex interface movement in the oscillation process of the single-film bubble is numerically captured, as well as typical flow phenomena and deformation characteristics of the liquid film. In addition, the basic behaviors of the coalescence and connection process between two and even three single-film bubbles are studied, and the cases with bubbles of different sizes are also included. Furthermore, the classic plateau structure in the foam system is reproduced and numerically proved to be in the steady state for multi-bubble connections.

Keyword :

plateau structure modeling Single film bubble mesh-less moving particle semi-implicit (MPS)

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GB/T 7714 Sun, Zhong-guo , Ni, Ni , Sun, Yi-jie et al. Modeling of single film bubble and numerical study of the plateau structure in foam system [J]. | JOURNAL OF HYDRODYNAMICS , 2018 , 30 (1) : 79-86 .
MLA Sun, Zhong-guo et al. "Modeling of single film bubble and numerical study of the plateau structure in foam system" . | JOURNAL OF HYDRODYNAMICS 30 . 1 (2018) : 79-86 .
APA Sun, Zhong-guo , Ni, Ni , Sun, Yi-jie , Xi, Guang . Modeling of single film bubble and numerical study of the plateau structure in foam system . | JOURNAL OF HYDRODYNAMICS , 2018 , 30 (1) , 79-86 .
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Investigation of transient flow characteristics inside a centrifugal compressor for design and off-design conditions EI SCIE Scopus
期刊论文 | 2018 , 232 (4) , 364-385 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

As the flow rate decreases from the design to the rotating stall condition, the enhanced impeller-diffuser interaction considerably deteriorates the flow condition at the diffuser inlet, which may trigger stall and blade vibration problems. In order to reveal the underlying mechanism and estimate the impact of the interaction within the impeller and diffuser passages, measurements using the wireless acquisition technique and high-frequency response system have been conducted on a 1.5 stage centrifugal compressor with the vaned diffuser. The details of its transient flow characteristics suggest that the effects of the impeller sweep extensively propagate in the diffuser passage. Distinctions of the shroud reversed vortex effect exist between the main and splitter blades at the impeller outlet, which initiates the predominant passage passing frequency at the diffuser inlet under small flow rate condition. In addition, the present study explains why the dominant disturbance shifts back and force between the passage passing frequency and blade passing frequency for different positions of the diffuser and flow rates. Through flow throttling, the diffuser reaction toward the impeller passage considerably strengthens due to the growing pressure potential near the convex surface of the diffuser vane, which is associated with the reversed flow.

Keyword :

rotor-stator effect transient Advanced measurement compressor aerodynamics centrifugal compressors

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GB/T 7714 Zhao, Jiayi , Wang, Zhiheng , Zhao, Yang et al. Investigation of transient flow characteristics inside a centrifugal compressor for design and off-design conditions [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2018 , 232 (4) : 364-385 .
MLA Zhao, Jiayi et al. "Investigation of transient flow characteristics inside a centrifugal compressor for design and off-design conditions" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 232 . 4 (2018) : 364-385 .
APA Zhao, Jiayi , Wang, Zhiheng , Zhao, Yang , Xi, Guang . Investigation of transient flow characteristics inside a centrifugal compressor for design and off-design conditions . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2018 , 232 (4) , 364-385 .
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A hybrid lattice Boltzmann and finite difference method for droplet dynamics with insoluble surfactants EI SCIE Scopus
期刊论文 | 2018 , 837 , 381-412 | JOURNAL OF FLUID MECHANICS
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

Droplet dynamics in microfluidic applications is significantly influenced by surfactants. It remains a research challenge to model and simulate droplet behaviour including deformation, breakup and coalescence, especially in the confined microfluidic environment. Here, we propose a hybrid method to simulate interfacial flows with insoluble surfactants. The immiscible two-phase flow is solved by an improved lattice Boltzmann colour-gradient model which incorporates a Marangoni stress resulting from non-uniform interfacial tension, while the convection-diffusion equation which describes the evolution of surfactant concentration in the entire fluid domain is solved by a finite difference method. The lattice Boltzmann and finite difference simulations are coupled through an equation of state, which describes how surfactant concentration influences interfacial tension. Our method is first validated for the surfactant-laden droplet deformation in a three-dimensional (3D) extensional flow and a 2D shear flow, and then applied to investigate the effect of surfactants on droplet dynamics in a 3D shear flow. Numerical results show that, at low capillary numbers, surfactants increase droplet deformation, due to reduced interfacial tension by the average surfactant concentration, and non-uniform effects from non-uniform capillary pressure and Marangoni stresses. The role of surfactants on the critical capillary number (Ca-cr) of droplet breakup is investigated for various confinements (defined as the ratio of droplet diameter to wall separation) and Reynolds numbers. For clean droplets, Cacr first decreases and then increases with confinement, and the minimum value of Ca-cr is reached at a confinement of 0.5; for surfactant-laden droplets, Ca-cr exhibits the same variation in trend for confinements lower than 0.7, but, for higher confinements, Ca-cr is almost a constant. The presence of surfactants decreases Ca-cr for each confinement, and the decrease is also attributed to the reduction in average interfacial tension and non-uniform effects, which are found to prevent droplet breakup at low confinements but promote breakup at high confinements. In either clean or surfactant-laden cases, Ca-cr first remains almost unchanged and then decreases with increasing Reynolds number, and a higher confinement or Reynolds number favours ternary breakup. Finally, we study the collision of two equal-sized droplets in a shear flow in both surfactant-free and surfactant-contaminated systems with the same effective capillary numbers. It is identified that the non-uniform effects in the near-contact interfacial region immobilize the interfaces when two droplets are approaching each other and thus inhibit their coalescence.

Keyword :

breakup/coalescence computational methods capillary flows

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GB/T 7714 Liu, Haihu , Ba, Yan , Wu, Lei et al. A hybrid lattice Boltzmann and finite difference method for droplet dynamics with insoluble surfactants [J]. | JOURNAL OF FLUID MECHANICS , 2018 , 837 : 381-412 .
MLA Liu, Haihu et al. "A hybrid lattice Boltzmann and finite difference method for droplet dynamics with insoluble surfactants" . | JOURNAL OF FLUID MECHANICS 837 (2018) : 381-412 .
APA Liu, Haihu , Ba, Yan , Wu, Lei , Li, Zhen , Xi, Guang , Zhang, Yonghao . A hybrid lattice Boltzmann and finite difference method for droplet dynamics with insoluble surfactants . | JOURNAL OF FLUID MECHANICS , 2018 , 837 , 381-412 .
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Investigation of the spike-stall warning method using the blade passing signal EI SCIE Scopus CSCD
期刊论文 | 2018 , 61 (6) , 830-842 | SCIENCE CHINA-TECHNOLOGICAL SCIENCES
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Abstract :

The vaned-diffuser usually brings compressor instability problems under the small flow rate, for instance the spike-type rotating stall phenomenon which restricts the operation range and may cause the trouble of blade fatigue. Since it is difficult to mathematically predict the spike-type stall for its randomness, finding out a practical method to warning this stall precursor appears to be meaningful. The paper explains the relationship between the spike-type precursor and the blade passing irregularity coefficient to analyze whether this coefficient is appropriate for the spike-stall warning inside a centrifugal compressor with the vaned-diffuser. The advanced wireless measurements were conducted on a 1.5 stages test centrifugal compressor to capture the unsteady behavior progressing from the design to stall inception within the region between the impeller trailing edge (TE) and diffuser leading edge (LE). The circumferential distribution of the blade passing irregularity has been quantitatively revealed. The steep increase of the blade passing irregularity at some "special locations", which is responsible for the onset of the spike-type precursor, is highlighted. Also, to further understand the spike precursor inside the diffuser passage corresponding to the circumferential "special location" with maximum irregularity, the high-response transient measurement within this passage is presented. With the help of full-annulus computational fluid dynamics (CFD) simulation and the mathematical model, it is proved that the blade passing irregularity precisely reflects the flow characteristics during the spike precursor, which presents the guidance for this stall warning method.

Keyword :

blade passing irregularity coefficient stall warning transient measurement centrifugal compressor

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GB/T 7714 Zhao JiaYi , Xi Guang , Wang ZhiHeng et al. Investigation of the spike-stall warning method using the blade passing signal [J]. | SCIENCE CHINA-TECHNOLOGICAL SCIENCES , 2018 , 61 (6) : 830-842 .
MLA Zhao JiaYi et al. "Investigation of the spike-stall warning method using the blade passing signal" . | SCIENCE CHINA-TECHNOLOGICAL SCIENCES 61 . 6 (2018) : 830-842 .
APA Zhao JiaYi , Xi Guang , Wang ZhiHeng , Zhao Yang . Investigation of the spike-stall warning method using the blade passing signal . | SCIENCE CHINA-TECHNOLOGICAL SCIENCES , 2018 , 61 (6) , 830-842 .
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An improved model for tip clearance loss in transonic axial compressors EI SCIE Scopus
期刊论文 | 2018 , 232 (4) , 295-314 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
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Abstract :

An improved compressible model for estimating tip clearance loss in transonic compressors is presented with the emphasis on the effects of blade tip loading distribution and double leakage flow. Tip clearance flow is treated as three parts along the chord and the progressive relations from upstream to downstream part is revealed to be responsible for the formation of tip clearance flow. Control volume method is applied to simplify the mixing process and calculate the mixed-out loss for the three parts, separately. Computational study shows that mass flow of the incoming flow entering the control volume is consistent with that passing through an equivalent area of about half of tip leakage vortex region. The new model reveals that the second part of tip clearance flow has a larger mixed-out loss capacity than the two other parts. This difference is attributed to two factors: larger injection flow angle and more enrolled incoming flow, and both factors tend to increase the mixed-out loss. The success of the model implies that blade design or flow control strategies turning the tip clearance/main flow interface's arrival onto blade tip pressure side downstream and the shock's impingement point onto blade tip suction side upstream may be beneficial in desensitizing compressor performance to tip clearance size, without trading off pressure rise.

Keyword :

Air-breathing engines compressor aerodynamics axial flow compressors leakage flow

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GB/T 7714 Ye, Shubo , Zhao, Qingjun , Cui, Weiwei et al. An improved model for tip clearance loss in transonic axial compressors [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2018 , 232 (4) : 295-314 .
MLA Ye, Shubo et al. "An improved model for tip clearance loss in transonic axial compressors" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 232 . 4 (2018) : 295-314 .
APA Ye, Shubo , Zhao, Qingjun , Cui, Weiwei , Xi, Guang , Xu, Jianzhong . An improved model for tip clearance loss in transonic axial compressors . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2018 , 232 (4) , 295-314 .
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Intelligence design method for three-dimensional vaned diffusers in a centrifugal compressor EI SCIE Scopus
期刊论文 | 2018 , 232 (6) , 674-690 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
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Abstract :

This paper presents a multi-objective optimization-based intelligence design method for the design of the three-dimensional vaned diffuser for a given centrifugal compressor. This design method consists of three-dimensional vaned diffuser design model and its solving strategy. The three-dimensional vaned diffuser design model consists of the diffuser geometry mathematical model, performance evaluation model, objective equation, and design space. The diffuser geometry is described by the mathematical model of the meridional configurations and vane camber, trailing edge lean, and thickness. The generic design space is determined through literature statistical investigation. An NSGA-II multi-objective optimization algorithm, utilized to solve the three-dimensional vaned diffuser design model, directs the diffuser geometry variables to achieve the maximum stage isentropic efficiency and static pressure ratio at the design point within the design space automatically and intelligently. The presented three-dimensional vaned diffuser design method is demonstrated using a case test for a centrifugal impeller. The convergence of evolutionary solving for this three-dimensional vaned diffuser model is analyzed in detail, which provides the convergence reference for engineering applications. Three representative three-dimensional vaned diffusers on Pareto front are utilized to check the diversity of geometry shape and overall range performance characteristics. The results show that the three-dimensional vaned diffuser design method established here has excellent potential in automated design and maximizing stage performance. The method reported here could provide a valuable reference for the intelligent design of radial turbomachinery diffusers.

Keyword :

multi-objective optimization intelligence design method three-dimensional vaned diffuser Centrifugal compressor

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GB/T 7714 Wang, Jian , Wen, Suping , Wang, Wenbo et al. Intelligence design method for three-dimensional vaned diffusers in a centrifugal compressor [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2018 , 232 (6) : 674-690 .
MLA Wang, Jian et al. "Intelligence design method for three-dimensional vaned diffusers in a centrifugal compressor" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 232 . 6 (2018) : 674-690 .
APA Wang, Jian , Wen, Suping , Wang, Wenbo , Xi, Guang . Intelligence design method for three-dimensional vaned diffusers in a centrifugal compressor . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2018 , 232 (6) , 674-690 .
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An extension of advancing front technique on new target surface after virtual topology operations EI SCIE Scopus
期刊论文 | 2018 , 124 , 42-52 | ADVANCES IN ENGINEERING SOFTWARE
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Abstract :

In this paper, an extension of advancing front technique (AFT) on new target surface (NTS) after virtual topology operations has been achieved in order to suitably represent CAD model and enhance the accuracy of numerical analyses. The extension of AFT has been accomplished through two stages. In the first stage, through analysis of the connection features of the intersecting lines with geometric continuity, a new notion of NTS is proposed. Based on the new notion, the topology of NTS is adjusted to generate meshes and meet the requirements of numerical analyses. In the second stage, AFT is extended accordingly in order to realize the topology of NTS. Specifically, based on the concise description of the front configuration of AFT, all of the subordinate aspects of AFT, including meshing order, generation of elements and nodes, and validity checking, are optimized. With the extension of AFT in this fashion, the target surfaces of AFT have been extended from the parametric surfaces to the composite surfaces. Finally, two examples are calculated with the extended AFT. The results of the calculation have verified that the topology of the composite surfaces is suitable and that the extended AFT is accurate and efficient.

Keyword :

Advancing front technique (AFT) Composite surfaces New target surface (NTS) Geometric continuity

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GB/T 7714 Wang Wei , Fan Hongzhou , Xi Guang . An extension of advancing front technique on new target surface after virtual topology operations [J]. | ADVANCES IN ENGINEERING SOFTWARE , 2018 , 124 : 42-52 .
MLA Wang Wei et al. "An extension of advancing front technique on new target surface after virtual topology operations" . | ADVANCES IN ENGINEERING SOFTWARE 124 (2018) : 42-52 .
APA Wang Wei , Fan Hongzhou , Xi Guang . An extension of advancing front technique on new target surface after virtual topology operations . | ADVANCES IN ENGINEERING SOFTWARE , 2018 , 124 , 42-52 .
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An efficient modified WENO scheme based on the identification of inflection points EI SCIE Scopus
期刊论文 | 2018 , 170 , 176-186 | COMPUTERS & FLUIDS
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Abstract :

In this paper, a new modified fifth-order weighted essentially non-oscillatory (WENO) scheme is proposed by introducing a switching principle based on the identification of inflection points. The switching principle adjusts the scheme between the linear upwind scheme and the WENO-M scheme automatically. If there is one or more inflection points located in the large reconstruction stencil, the WENO-M procedure is applied to reconstruct the numerical flux, instead of the classical WENO scheme; otherwise, the linear upwind scheme is used. The new scheme is more efficient due to the identification of the inflection points, and has higher numerical accuracy and resolution due to the usage of WENO-M procedure. A set of benchmark problems are conducted and analyzed to verify the performance enhancement. The extreme shock tube problem of Leblanc is computed to demonstrate the robustness of the new scheme. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Computational efficiency High resolution WENO scheme Inflection point

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GB/T 7714 Chai, Delin , Xi, Guang , Sun, Zhongguo et al. An efficient modified WENO scheme based on the identification of inflection points [J]. | COMPUTERS & FLUIDS , 2018 , 170 : 176-186 .
MLA Chai, Delin et al. "An efficient modified WENO scheme based on the identification of inflection points" . | COMPUTERS & FLUIDS 170 (2018) : 176-186 .
APA Chai, Delin , Xi, Guang , Sun, Zhongguo , Wang, Zhiheng , Huang, Zhu . An efficient modified WENO scheme based on the identification of inflection points . | COMPUTERS & FLUIDS , 2018 , 170 , 176-186 .
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Numerical study on interaction of tip synthetic jet with tip leakage flow in centrifugal impeller EI Scopus
会议论文 | 2018 , 2B-2018 | ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
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The synthetic jet, located at the shroud and close to the blade leading edge, is used to control the flow in a typical centrifugal impeller. The effects of the synthetic jet control and the interaction with the tip leakage flow are mainly investigated at the near-stall working point of impeller using the unsteady numerical analysis. The results indicate that, the effect of the synthetic jet with a small injection angle (15deg) is better when the excitation position is located over the main blade leading edge. However, the synthetic jet with a large injection angle (90deg) obtains a better result when the excitation position is located at the downstream of main blade leading edge. The synthetic jet with a larger velocity amplitude has a more remarkable effect on deflecting the main flow/tip leakage flow interface to the downstream direction. With typical parameters, the synthetic jet increases the circumferentially averaged streamwise location of the main flow/tip leakage flow interface by 12.5% compared with the case without a synthetic jet. The interaction between the tip leakage flow and synthetic jet makes the tip leakage flow out of the tip clearance with larger streamwise momentum, which is favorable to restrain the tip leakage flow to spill out the leading edge. Besides, the periodic blade loading drop is deflected to downstream direction and the flow fluctuation near the leading edge decrease significantly with the presence of synthetic jet. © Copyright 2018 ASME.

Keyword :

Centrifugal impeller Excitation position Flow fluctuations Injection angles Streamwise locations Tip leakage flow Unsteady numerical analysis Velocity amplitudes

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GB/T 7714 Huang, Wenlin , Zhao, Huijing , Wang, Zhiheng et al. Numerical study on interaction of tip synthetic jet with tip leakage flow in centrifugal impeller [C] . 2018 .
MLA Huang, Wenlin et al. "Numerical study on interaction of tip synthetic jet with tip leakage flow in centrifugal impeller" . (2018) .
APA Huang, Wenlin , Zhao, Huijing , Wang, Zhiheng , Xi, Guang , Liu, Haijun . Numerical study on interaction of tip synthetic jet with tip leakage flow in centrifugal impeller . (2018) .
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The unsteady pre-stall behavior of the spike-type rotating stall within an airfoil vaned-diffuser EI Scopus
会议论文 | 2018 , 2A-2018 | ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
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Abstract :

The spike-type rotating stall(RS) inception inside the vaned-diffuser, which seriously restricts the performance range and brings the problems of blade fatigue, still seems to be a ‘mystery’ since its randomness. The paper intends to explain the mechanisms of this stall inception. To quantitatively assess the critical unsteady behavior to the initiation of RS inception, the transient measurement characterizes the process falling into the RS through the parameter of ‘blade passing irregularity’. The underlying vortex disturbance, related to the growing of the flow complexity and the final spike-type precursor, is further revealed by the full-annulus simulation. The results show the propagation principle of the vortexes from the design to the stall inception point, reflected by the distribution of ‘blade passing irregularity’. The performance change of different sub-components due to the vortex behavior is presented. At the RS limit, the sudden ramp-up of the ‘blade passing irregularity’ near the leading edge (LE), accompanied with the drop of the static pressure rise in the sub-component between the semi-vaneless and throat, corresponds to the spike-type inception in the form of a clockwise vortex connecting the suction side of the diffuser vane and the pressure side of the adjacent vane. Besides, when approaching the spike-type inception point, the couple effect of the growing potential of the diffuser vane and the enhanced vortex disturbance at the impeller outlet degrades the diffuser inlet flow. Copyright © 2018 ASME.

Keyword :

Impeller outlet Rotating stalls Stall inception Static pressure Transient measurement Unsteady behaviors Vaned diffuser Vortex behavior

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GB/T 7714 Zhao, Jiayi , Xi, Guang , Wang, Zhiheng et al. The unsteady pre-stall behavior of the spike-type rotating stall within an airfoil vaned-diffuser [C] . 2018 .
MLA Zhao, Jiayi et al. "The unsteady pre-stall behavior of the spike-type rotating stall within an airfoil vaned-diffuser" . (2018) .
APA Zhao, Jiayi , Xi, Guang , Wang, Zhiheng , Zhao, Yang . The unsteady pre-stall behavior of the spike-type rotating stall within an airfoil vaned-diffuser . (2018) .
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