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< Page ,Total 46 >
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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Abstract :

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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Numerical investigation of diffuser rotating stall and system instability in a centrifugal compressor with 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 operating range of a centrifugal compressor is often limited by the occurrence of the flow instability, such as diffuser rotating stall or system surge. In the paper, the unsteady numerical simulations are performed on a low-speed centrifugal compressor to investigate the characteristic of the rotating stall in the vaned diffuser. And also, the developed model of lumped parameter is used to predict the system instability. The flow field in the diffuser is firstly investigated at near stall condition. It is found that the leading-edge vortex and the secondary flow induce the hub-corner separation at the suction side of the diffuser blade. When the mass flow rate is reduced gradually, the fore part of the volute turns to act as a diffuser from a nozzle. Under the influence of the asymmetry induced by the volute, the hub-corner separation firstly develops into rotating stall in the passage with the lowest mass flow rate when at critical stall point. And then the diffuser rotating stall propagates along the circumferential direction at about 7% of the impeller speed. And also, the model of lumped parameter considering the effect of rotating stall is developed to analyze the system instability of mild surge. The predicted vibration frequency is within 5.8% of the measurement and the predicted transient process in mild surge matches well with the measurement. With different volume of the compressed air, the transient compressor characteristic tends to be stabilized or oscillates in a cycle along the counter-clockwise with different magnitude. Copyright © 2018 ASME.

Keyword :

Circumferential direction Compressor characteristics Flow instabilities Leading-edge vortices Near stall conditions Numerical investigations Unsteady numerical simulations Vibration frequency

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GB/T 7714 Zhao, Yang , Xi, Guang , Zhao, Jiayi . Numerical investigation of diffuser rotating stall and system instability in a centrifugal compressor with vaned diffuser [C] . 2018 .
MLA Zhao, Yang et al. "Numerical investigation of diffuser rotating stall and system instability in a centrifugal compressor with vaned diffuser" . (2018) .
APA Zhao, Yang , Xi, Guang , Zhao, Jiayi . Numerical investigation of diffuser rotating stall and system instability in a centrifugal compressor with vaned diffuser . (2018) .
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Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade EI Scopus CSCD PKU
期刊论文 | 2018 , 39 (1) , 33-45 | Tuijin Jishu/Journal of Propulsion Technology
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Abstract :

To investigate the effect of endwall synthetic jet(SJ) on vortex structure and flow loss reduction in a high-loaded turbine cascade, unsteady numerical model of Durham cascade with SJ installed at the endwall upstream of the blade was established. A series of simulations were performed to determine beneficial excitation parameters. At the optimal excitation parameters, the influence of SJ on vortex structure and flow loss were investigated in detail and the association between them was focused on. The results indicated that the sizes of the horseshoe vortex and passage vortex were reduced; the transverse vortex originated from adjacent pressure surface were weakened; the corner vortex was slightly strengthened; the wall vortex was receded indirectly. Total pressure loss coefficient was decreased by 10.72% at the optimal excitation parameters when dimensionless excitation amplitude and frequency were 0.073 and 1, respectively. From the perspective of control mechanism, SJ enhanced the mixing of main fluid and boundary-layer fluid downstream of the jet, the momentum of boundary-layer fluid increased, so that the horseshoe vortex was weakened. SJ influenced the boundary separation at the pressure face of the blade, the region and position of low-energy fluid caused by boundary separation were changed, so that the transverse vortex was weakened. Flow loss was reduced as a result of weakened vortexes. © 2018, Editorial Department of Journal of Propulsion Technology. All right reserved.

Keyword :

Active flow control Excitation parameters Flow loss Synthetic jets Vortex structures

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GB/T 7714 Yu, Hong-Shi , Wang, Zhi-Heng , Xi, Guang . Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade [J]. | Tuijin Jishu/Journal of Propulsion Technology , 2018 , 39 (1) : 33-45 .
MLA Yu, Hong-Shi et al. "Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade" . | Tuijin Jishu/Journal of Propulsion Technology 39 . 1 (2018) : 33-45 .
APA Yu, Hong-Shi , Wang, Zhi-Heng , Xi, Guang . Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade . | Tuijin Jishu/Journal of Propulsion Technology , 2018 , 39 (1) , 33-45 .
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The impact of circumferential casing grooves on rotating instability in a transonic axial compressor EI Scopus
期刊论文 | 2018 | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering
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Abstract :

The impact of circumferential casing grooves on rotating instability is first assessed for both design and part speed operations in a transonic axial compressor, with the purpose of developing the next generation casing treatments for vibration control. Multi-passage time-resolved computations are performed to capture the origination and propagation behavior of the instability for cases with and without casing grooves. Probed pressure signals in different passages show a nonsynchronous fluctuation of tip flow. It proves tip leakage vortex and its self-excited oscillation is responsible for this type of inconsistence, regardless of the compressor operation speed. Although flow separation on blade suction surface and the consequent shedding vortex contributes to another origin of instability, the resulted flow appears to be consistent. Casing grooves are able to enhance the synchronization by greatly suppressing both tip leakage vortex oscillations and the intermittently shedding separation vortex, especially in the front part of blade passage. Both types of instability are constrained in several separated axial scope by casing grooves, which essentially increase the damping of flow oscillations. Thus, further improvement of casing treatment design can be expected if the axial transport of the instability in the tip region is restrained more efficiently, for both extending stall margin and enhancing aerodynamic stability. © 2018, © IMechE 2018.

Keyword :

Circumferential casing grooves nonsynchronous fluctuation Rotating instability Shedding vortex Speed operation Tip clearance vortex Transonic axial compressors

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GB/T 7714 Ye, Shubo , Zhao, Qingjun , Zhou, Xiaoyong et al. The impact of circumferential casing grooves on rotating instability in a transonic axial compressor [J]. | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering , 2018 .
MLA Ye, Shubo et al. "The impact of circumferential casing grooves on rotating instability in a transonic axial compressor" . | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering (2018) .
APA Ye, Shubo , Zhao, Qingjun , Zhou, Xiaoyong , Xi, Guang , Xu, Jianzhong . The impact of circumferential casing grooves on rotating instability in a transonic axial compressor . | Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering , 2018 .
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Numerical Study on Hydrodynamic Characteristics of Moored Offshore Floating Platform EI Scopus CSCD PKU
期刊论文 | 2018 , 39 (2) , 307-313 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

A two-way fluid-structure interaction model and a linear elastic cable model were established based on the moving particle semi-implicit (MPS) method. The motions of the moored offshore floating platform in regular waves were analyzed by numerical simulations. The hydrodynamic characteristics of the moored floating platform in different mooring types were investigated systematically, and the results conclude that the surge, heave and pitch of the platform and the force of the mooring cables all show a variation of trigonometric function in two-dimensional cases. Furthermore, it can effectively control the surge of the platform and reduce the heave when the number of mooring cables increases. The uneven forces to the platform could be avoided on the condition that the mooring positions were symmetrical to the mass center of the platform, which would decrease the swing angles of the platform. © 2018, Science Press. All right reserved.

Keyword :

Floating platforms Hydrodynamic characteristics Linear elastic Moving particle semiimplicit method MPS methods Offshore floating Trigonometric functions Two-way fluid structure interactions

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GB/T 7714 Sun, Yi-Jie , Sun, Zhong-Guo , Cao, Wen-Jin et al. Numerical Study on Hydrodynamic Characteristics of Moored Offshore Floating Platform [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (2) : 307-313 .
MLA Sun, Yi-Jie et al. "Numerical Study on Hydrodynamic Characteristics of Moored Offshore Floating Platform" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 2 (2018) : 307-313 .
APA Sun, Yi-Jie , Sun, Zhong-Guo , Cao, Wen-Jin , Xi, Guang . Numerical Study on Hydrodynamic Characteristics of Moored Offshore Floating Platform . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (2) , 307-313 .
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Thermodynamic Analysis on a Novel Compressed-Air Based Pumped Hydro Energy Storage System EI Scopus CSCD PKU
期刊论文 | 2018 , 52 (3) , 12-18 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
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Abstract :

To explore the methods of overcoming the two inherent drawbacks of renewable energy sources (i.e., intermittency and fluctuation), a novel compressed-air based pumped hydro energy storage (CA-PHES) system is proposed using the laws of thermodynamics and the principle of cascade energy utilization in this paper. Firstly, the thermodynamic model of the system was built to evaluate the system's thermodynamic performance. The energy efficiency of this system was investigated with respect to several key parameters, i. e., the discharge time of hydro turbine, the minimum pressure in the air storage cavern, the efficiency of each equipment and the distribution of pressure ratio in compressor and turbine. The result indicated that the system's energy efficiency increases with the increasing of the minimum air pressure in the air storage cavern. While with the increasing of the discharge time of hydro turbine, the energy efficiency reaches its maximum value at 1.5 hour and then decreases. Furthermore, the most effective way to improve the energy efficiency is to increase the isentropic efficiency of turbine. By employing an evolutionary multi-objective algorithm, the energy efficiency could reach 71.82%. The results could provide valuable theoretical basis for the further engineering application of this energy storage system. © 2018, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

Keyword :

Energy storage systems Engineering applications Evolutionary multi-objective algorithms Laws of thermodynamics Pumped-hydro energy storages Renewable energy source Thermo dynamic analysis Thermodynamic performance

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GB/T 7714 Yao, Erren , Xi, Guang , Wang, Huanran et al. Thermodynamic Analysis on a Novel Compressed-Air Based Pumped Hydro Energy Storage System [J]. | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2018 , 52 (3) : 12-18 .
MLA Yao, Erren et al. "Thermodynamic Analysis on a Novel Compressed-Air Based Pumped Hydro Energy Storage System" . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 52 . 3 (2018) : 12-18 .
APA Yao, Erren , Xi, Guang , Wang, Huanran , Zou, Hansen , Li, Ruixiong , Hu, Yang et al. Thermodynamic Analysis on a Novel Compressed-Air Based Pumped Hydro Energy Storage System . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2018 , 52 (3) , 12-18 .
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多层高速旋转过盈配合圆筒的应力分析及径向尺寸优化设计方法研究 EI CSCD PKU
期刊论文 | 2018 , 35 (10) , 212-221 | 工程力学
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Abstract :

为了完善离心力作用下的多层圆筒过盈配合理论以及得到一定约束条件下较优的过盈配合设计方案,该文首先推导了多层旋转圆筒应力和变形分析解析公式以及多层旋转圆筒过盈配合设计公式,然后基于以上理论,以所定义的旋转圆筒最小安全裕度为适应度函数,采用遗传算法优化名义半径使圆筒的最小安全裕度最大化.根据优化并取整后的名义半径,采用有限元软件(ANSYS Workbench)建立磁悬浮轴承转子三维模型模拟了最大过盈条件下装配过程,并且比较了解析方法与有限元的等效应力结果.研究结果表明:所采用的名义尺寸优化方法提高了旋转圆筒的安全系数,增加了转子的安全性;本文模型中的最外层圆筒内壁为最危险环面,此处有限元方法所得最大等效应力比解析方法结果高18.72%,仅采用解析方法预测结果时应适当提高校核安全系数;所给出的解析方法与数值分析方法所得结果总体结果吻合良好,因此所提解析方法可以用于多层旋转圆筒的过盈配合初步设计、分析以及提供理论指导.

Keyword :

有限元法 过盈配合 尺寸优化 应力分析 磁悬浮轴承 解析法 旋转圆筒

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GB/T 7714 张鹏飞 , 王志恒 , 席光 . 多层高速旋转过盈配合圆筒的应力分析及径向尺寸优化设计方法研究 [J]. | 工程力学 , 2018 , 35 (10) : 212-221 .
MLA 张鹏飞 et al. "多层高速旋转过盈配合圆筒的应力分析及径向尺寸优化设计方法研究" . | 工程力学 35 . 10 (2018) : 212-221 .
APA 张鹏飞 , 王志恒 , 席光 . 多层高速旋转过盈配合圆筒的应力分析及径向尺寸优化设计方法研究 . | 工程力学 , 2018 , 35 (10) , 212-221 .
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Experimental Study of Tip Clearance Effects on Performance and Flow Field of a Centrifugal Compressor EI
期刊论文 | 2018 , 39 (7) , 1453-1460 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

In this paper, the experiment is carried out to study the effects of tip clearance on overall performance and flow field of a centrifugal compressor, and the operating tip clearance sizes of the impeller are measured by the Non-contact optical fiber displacement sensors. The results shows that, the operating tip clearance sizes fluctuate as time, the averaged operating tip clearance is smaller than the cold one. The pressure ratio and efficiency of centrifugal compressor decrease as the tip clearance increases, and the effects are more obvious with higher rotation speed. At the same time, the analysis of flow field indicates that, the influencing zone of tip clearance flow move upstream as the flow rate decreases. An increased tip clearance expands the influencing zone of tip clearance flow and increases the pressure loss. © 2018, Science Press. All right reserved.

Keyword :

Optical fiber displacement Pressure ratio Rotation speed Static pressure Tip clearance Tip clearance effects Tip clearance flow Tip clearance sizes

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GB/T 7714 Zhao, Hui-Jing , Xi, Guang , Duan, Ya-Fei et al. Experimental Study of Tip Clearance Effects on Performance and Flow Field of a Centrifugal Compressor [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (7) : 1453-1460 .
MLA Zhao, Hui-Jing et al. "Experimental Study of Tip Clearance Effects on Performance and Flow Field of a Centrifugal Compressor" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 7 (2018) : 1453-1460 .
APA Zhao, Hui-Jing , Xi, Guang , Duan, Ya-Fei , Wang, Zhi-Heng . Experimental Study of Tip Clearance Effects on Performance and Flow Field of a Centrifugal Compressor . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (7) , 1453-1460 .
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Numerical Investigations on Inuence of Volute Non-Axisymmetry on Unsteady Flow in Centrifugal Compressor EI
期刊论文 | 2018 , 39 (11) , 2412-2419 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

The influence of volute non-axisymmetry on the unsteady flow in a centrifugal compressor is investigated by the unsteady numerical simulation. The results indicate that, the flow unsteady uctuation in the centrifugal compressor is dominated by the impeller. The inuence of volute non-axisymmetry can be propagated to the leading edge of impeller when the volute is operated away from its design condition. The influence of the non-axisymmetric structure of volute on the instantaneous pressure at the pressure surface of diffuser vane is mainly on the main and splitter blades passing frequency at the low and design flow rates, while the impeller shaft rotating frequency also plays an important role under the large flow rate condition. The pressure uctuation on the pressure surface of impeller main blade is mainly affected by the impeller shaft rotation frequency, the diffuser blade passing frequency and their multiple frequencies. © 2018, Science Press. All right reserved.

Keyword :

Axisymmetric structure Axisymmetry Instantaneous pressures Multiple frequency Numerical investigations Rotating frequencies Unsteady numerical simulations Volute

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GB/T 7714 Yang, Yang , Wang, Zhi-Heng , Xi, Guang . Numerical Investigations on Inuence of Volute Non-Axisymmetry on Unsteady Flow in Centrifugal Compressor [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (11) : 2412-2419 .
MLA Yang, Yang et al. "Numerical Investigations on Inuence of Volute Non-Axisymmetry on Unsteady Flow in Centrifugal Compressor" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 11 (2018) : 2412-2419 .
APA Yang, Yang , Wang, Zhi-Heng , Xi, Guang . Numerical Investigations on Inuence of Volute Non-Axisymmetry on Unsteady Flow in Centrifugal Compressor . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (11) , 2412-2419 .
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