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神经网络对于翼型绕流流场的重构 CSCD
期刊论文 | 2021 , 42 (5) , 1205-1212 | 工程热物理学报
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Abstract :

本文试图通过神经网络重构二维低雷诺数翼型绕流非定常流场.首先通过局部径向基函数(LRBF)求解器求解不可压缩流动控制方程得到计算域内流场信息,然后随机选取一些时空域内的数据点(包含位置信息和速度信息)作为训练数据代入神经网络进行训练.先学习训练得到流动的雷诺数后进行流场的重构,并与LRBF求解器得到的数值结果进行对比.流动计算中雷诺数设置为200,攻角为20°,计算域离散采用局部节点加密技术以减少计算量.

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GB/T 7714 王同生 , 孙中国 , 黄柱 et al. 神经网络对于翼型绕流流场的重构 [J]. | 工程热物理学报 , 2021 , 42 (5) : 1205-1212 .
MLA 王同生 et al. "神经网络对于翼型绕流流场的重构" . | 工程热物理学报 42 . 5 (2021) : 1205-1212 .
APA 王同生 , 孙中国 , 黄柱 , 席光 . 神经网络对于翼型绕流流场的重构 . | 工程热物理学报 , 2021 , 42 (5) , 1205-1212 .
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Reconstruction of Fluid Flows Past Airfoils Using Neural Network EI
期刊论文 | 2021 , 42 (5) , 1205-1212 | Journal of Engineering Thermophysics
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Abstract :

Present paper attempts to reconstruct 2D unsteady flow field using neural network when fluid flows past airfoils at low Reynolds number. First of all, the details of fluid domain are obtained by solving incompressible fluid governing equation using our own developed fluid solver based on local radial basis function (LRBF) method, and then some randomly selected tempo-spatial points (with velocities and pressure information) are fed into neural network to train. The training process of first step is to learn Reynolds number, continuing with reconstruction of fluid field and comparison with numerical results. The flow Reynolds number is set as 200, while angle of attack is 20°. Besides, the locally refined nodes distribution of spatial domain is to globally reduce the computing resource. © 2021, Science Press. All right reserved.

Keyword :

Airfoils Angle of attack Neural networks Reynolds number Unsteady flow

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GB/T 7714 Wang, Tong-Sheng , Sun, Zhong-Guo , Huang, Zhu et al. Reconstruction of Fluid Flows Past Airfoils Using Neural Network [J]. | Journal of Engineering Thermophysics , 2021 , 42 (5) : 1205-1212 .
MLA Wang, Tong-Sheng et al. "Reconstruction of Fluid Flows Past Airfoils Using Neural Network" . | Journal of Engineering Thermophysics 42 . 5 (2021) : 1205-1212 .
APA Wang, Tong-Sheng , Sun, Zhong-Guo , Huang, Zhu , Xi, Guang . Reconstruction of Fluid Flows Past Airfoils Using Neural Network . | Journal of Engineering Thermophysics , 2021 , 42 (5) , 1205-1212 .
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Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes EI
期刊论文 | 2021 , 42 (1) , 115-120 | Journal of Engineering Thermophysics
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In this paper, a finite volume WENO scheme on OpenFOAM, which can achieve arbitrary high order and be applied to unstructured grids, is used to simulate the viscous shock tube. The simulation is conducted on structured grids and triangular unstructured grids, in which the third-order and fourth-order WENO schemes are used to discretize the convection term. The results show that the accuracy and efficiency of the scheme on triangular unstructured grids are better than that on structured grids, and the efficiency of the third-order WENO scheme is higher than that of the fourth-order scheme. This work shows that the third-order WENO scheme with unstructured grids on OpenFOAM has more advantages and application potential in the simulation of complex flow fields such as internal flow of turbomachinery. © 2021, Science Press. All right reserved.

Keyword :

Efficiency Shock tubes

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GB/T 7714 Chai, De-Lin , Xi, Guang , Sun, Zhong-Guo . Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes [J]. | Journal of Engineering Thermophysics , 2021 , 42 (1) : 115-120 .
MLA Chai, De-Lin et al. "Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes" . | Journal of Engineering Thermophysics 42 . 1 (2021) : 115-120 .
APA Chai, De-Lin , Xi, Guang , Sun, Zhong-Guo . Simulations of the Viscous Shock Tube With Finite Volume WENO Schemes . | Journal of Engineering Thermophysics , 2021 , 42 (1) , 115-120 .
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Research on Preliminary Design and Analysis Method of Mixed-flow/Centrifugal Compressor EI
期刊论文 | 2021 , 42 (2) , 393-398 | Journal of Engineering Thermophysics
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The preliminary design and analysis methods of single-stage mixed-flow/centrifugal compressors were studied on the basis of the two-zone model, and the accuracy of the improved ODP problem iterative method based on SOA-TEIS mixed diffusion model in the preliminary design and analysis of the mixed-flow/centrifugal compressor was verified. The one-dimensional design and analysis of Krain high specific speed impeller and low specific speed impeller models were carried out using this method, and the results were compared with experimental data. The results show that the method presented in this paper could reduce the dependence on engineering experience parameter selection, and achieve accurate preliminary design calculations and off-design point performance predictions for mixed-flow/centrifugal compressors. The method was easy to implement programmatically, and the isentropic efficiency prediction deviation of the operating conditions near the design point obtained by the passive slip factor calculation method was within 1%. © 2021, Science Press. All right reserved.

Keyword :

Compressors Design Impellers Iterative methods

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GB/T 7714 Tang, Yong-Hong , Wang, Zhi-Heng , Ji, Cheng et al. Research on Preliminary Design and Analysis Method of Mixed-flow/Centrifugal Compressor [J]. | Journal of Engineering Thermophysics , 2021 , 42 (2) : 393-398 .
MLA Tang, Yong-Hong et al. "Research on Preliminary Design and Analysis Method of Mixed-flow/Centrifugal Compressor" . | Journal of Engineering Thermophysics 42 . 2 (2021) : 393-398 .
APA Tang, Yong-Hong , Wang, Zhi-Heng , Ji, Cheng , Xi, Guang . Research on Preliminary Design and Analysis Method of Mixed-flow/Centrifugal Compressor . | Journal of Engineering Thermophysics , 2021 , 42 (2) , 393-398 .
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Numerical investigation on propagation characteristics of inlet total-pressure distortion in a centrifugal compressor EI
会议论文 | 2021 , 2D-2021 | ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition, GT 2021
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The propagation characteristics of inlet total-pressure distortion in a centrifugal compressor are investigated by fullannulus unsteady three-dimensional numerical simulation. The inlet distortions considered in the paper are the total-pressure distortions covering a 60-deg sector (60deg distortion) and three 20-deg sectors (3∗20deg distortion), respectively. One is the classical distortion form, and the other is to simulate the downstream flow of the axial section of a centrifugal-axial combined compressor. By analyzing the distributions of flow parameters, the propagation of the total-pressure distortion in the centrifugal compressor is interpreted. The results show that, with the distortion propagating to the downstream, the lowpressure region produces a phase deviation along the streamwise direction relative to the opposite direction of impeller rotation direction, and the range of distortion region is reduced. Additionally, the propagation of the inlet distortion makes the three-dimensional characteristics of airflow more complex. The flow angle increases with different amplitudes along the direction of blade height corresponding to the distorted sector. The distortion region affects the location of blades which are in a low-pressure area, and the intensity of the distortion affects the increase of the flow angle. The distortion region causes more local relative flow losses, especially near the leading edge of blade suction surface. © 2021 American Society of Mechanical Engineers (ASME). All rights reserved.

Keyword :

Centrifugal compressors Centrifugation

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GB/T 7714 Wang, Mingyi , Wang, Zhiheng , Xi, Guang et al. Numerical investigation on propagation characteristics of inlet total-pressure distortion in a centrifugal compressor [C] . 2021 .
MLA Wang, Mingyi et al. "Numerical investigation on propagation characteristics of inlet total-pressure distortion in a centrifugal compressor" . (2021) .
APA Wang, Mingyi , Wang, Zhiheng , Xi, Guang , Li, Yurun . Numerical investigation on propagation characteristics of inlet total-pressure distortion in a centrifugal compressor . (2021) .
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Multiphysics Coupling Simulation and Parameter Study of Planar Solid Oxide Fuel Cell. PubMed SCIE
期刊论文 | 2021 , 8 | Frontiers in chemistry
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Abstract :

In this paper, a numerical model of gas flow, heat transfer, mass transfer and electrochemical reaction multi-physics field coupling of a planar SOFC is established and solved. According to the calculation results, the distribution of velocity, temperature and concentration inside the SOFC cell is analyzed. The influence of cathode inlet flow rate, porosity, rib width and other parameters on the performance of SOFC is also discussed. The results show that within a certain range, increasing the cathode inlet flow rate can significantly increase the average current density of the cell. Increasing the porosity of the electrode can improve the gas diffusion of the porous electrode, thereby increasing the rate of the electrochemical reaction. Increasing the width of the ribs will result in a significant decrease in cell performance. Therefore, the rib width should be reduced as much as possible within the allowable range to optimize the working performance of the cell.

Keyword :

multiphysics coupling parameter study physical fields distribution solid oxide fuel cells work performance

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GB/T 7714 Dang Zheng , Shen Xin , Ma Jinyan et al. Multiphysics Coupling Simulation and Parameter Study of Planar Solid Oxide Fuel Cell. [J]. | Frontiers in chemistry , 2021 , 8 .
MLA Dang Zheng et al. "Multiphysics Coupling Simulation and Parameter Study of Planar Solid Oxide Fuel Cell." . | Frontiers in chemistry 8 (2021) .
APA Dang Zheng , Shen Xin , Ma Jinyan , Jiang Zhaoyi , Xi Guang . Multiphysics Coupling Simulation and Parameter Study of Planar Solid Oxide Fuel Cell. . | Frontiers in chemistry , 2021 , 8 .
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Reconstruction of natural convection within an enclosure using deep neural network EI SCIE
期刊论文 | 2021 , 164 | International Journal of Heat and Mass Transfer
WoS CC Cited Count: 6
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Abstract :

The deep neural network (DNN) is an extensively used technique to fit the high dimensional data. Fluid flow and heat transfer in macroscale are one of the complex physical phenomena which are governed by the Navier-Stokes (N-S) equation. The conventional numerical method (e.g., finite difference method) can solve the equation with corresponding boundary conditions using kinds of spatial discretized methods. In the present paper, the deep neural network can also be used to train and compute the results even if the training data only comes from boundary conditions of velocities and temperature. For the natural convection with few computational fluid dynamics (CFD) based velocities and temperature, the loss function of deep neural network, which mixes the explicit constraint of N-S equation, can reconstruct the fluid and heat field accurately. Usually, the complex geometry or high Rayleigh (Ra) number are corresponding to the complicate distribution of velocities and temperature field, which need more training points to achieve impressive accuracy. The present paper comprehensively investigates reconstructing results with different training data when Ra=103, and finds that only 1.48% points of CFD based data can obtain the impressive conclusion. Besides, the attempt of predicting velocities and temperature of the whole domain from partial region training data has been conducted. Global relative errors of velocities and temperature of Ra=105converge to the value, which is a little larger thanRa=104, although the latter case possesses more training points. When increasing the Rayleigh number to 106, the reconstruction of unsteady natural convection still remains high accuracy even if only 10 snapshots are considered. For the reconstruction of natural convection with complex geometry, the results show that more training points should be fed into the deep neural network to train and learn accurate results. © 2020 Elsevier Ltd

Keyword :

Boundary conditions Clustering algorithms Complex networks Computational fluid dynamics Deep neural networks Finite difference method Flow of fluids Geometry Natural convection Navier Stokes equations Neural networks Numerical methods Velocity

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GB/T 7714 Wang, Tongsheng , Huang, Zhu , Sun, Zhongguo et al. Reconstruction of natural convection within an enclosure using deep neural network [J]. | International Journal of Heat and Mass Transfer , 2021 , 164 .
MLA Wang, Tongsheng et al. "Reconstruction of natural convection within an enclosure using deep neural network" . | International Journal of Heat and Mass Transfer 164 (2021) .
APA Wang, Tongsheng , Huang, Zhu , Sun, Zhongguo , Xi, Guang . Reconstruction of natural convection within an enclosure using deep neural network . | International Journal of Heat and Mass Transfer , 2021 , 164 .
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A flow information-based prediction model applied to the nonaxisymmetric hub optimization of a centrifugal impeller EI SCIE
期刊论文 | 2021 , 143 (10) | Journal of Mechanical Design, Transactions of the ASME
WoS CC Cited Count: 1
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Abstract :

A full-range prediction model for turbomachinery based on the flow-field information code is established in this article to solve the problems that traditional models do not have enough prediction accuracy and cannot reflect the complete performance characteristics of the impeller. The model, which can predict the complete performance curve of the impeller with higher accuracy, consists of two multilayer artificial neural network (ANN) submodels. Different from the traditional model, the ANN submodel uses the flow-field information code for pretraining layer by layer. The flow-field information code is the characteristic information extracted from the impeller flow field through the proper orthogonal decomposition (POD) method. By implicitly learning the flow-field information, the prediction error of the model is reduced by 29.7% compared with the single hidden layer ANN. Based on this model, the nonaxisymmetric, but periodic, hub optimization of a centrifugal impeller with 30 variables is carried out, with the goals of the higher efficiency and the wider flow range at the specified pressure ratio and the massflow rate at the design point. The result shows that, after the optimization, the isentropic efficiency at the design point increases by 1% and the flow range increases by 2% compared to the baseline. Copyright © 2021 by ASME

Keyword :

Centrifugation Efficiency Flow fields Forecasting Impellers Multilayer neural networks Predictive analytics

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GB/T 7714 Ji, Cheng , Wang, Zhiheng , Tang, Yonghong et al. A flow information-based prediction model applied to the nonaxisymmetric hub optimization of a centrifugal impeller [J]. | Journal of Mechanical Design, Transactions of the ASME , 2021 , 143 (10) .
MLA Ji, Cheng et al. "A flow information-based prediction model applied to the nonaxisymmetric hub optimization of a centrifugal impeller" . | Journal of Mechanical Design, Transactions of the ASME 143 . 10 (2021) .
APA Ji, Cheng , Wang, Zhiheng , Tang, Yonghong , Xi, Guang . A flow information-based prediction model applied to the nonaxisymmetric hub optimization of a centrifugal impeller . | Journal of Mechanical Design, Transactions of the ASME , 2021 , 143 (10) .
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Thermo-economic-environmental analysis of an innovative combined cooling and power system integrating Solid Oxide Fuel Cell, Supercritical CO2 cycle, and ejector refrigeration cycle EI SCIE
期刊论文 | 2021 , 47 | Sustainable Energy Technologies and Assessments
WoS CC Cited Count: 3
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Abstract :

A novel combined cooling and power system integrating Solid Oxide Fuel Cell (SOFC), Supercritical CO2 (SCO2) partial heating cycle, and ejector refrigeration cycle is proposed, and the energy, exergy, exergoeconomic, and environmental analysis is performed to evaluate the system performance comprehensively. The parametric analysis is conducted to investigate the effects of six thermodynamic variables (i.e. fuel flow rate, excess air ratio, fuel utilization factor, turbine inlet temperature, SCO2 cycle pressure ratio, and SCO2 cycle split ratio) on the system performance. The results indicate that the lower total product unit cost conflicts with the higher thermodynamic efficiencies and lower CO2 specific emission. Therefore, multi-objective optimization is carried out to obtain a trade-off among thermodynamic, exergoeconomic, and environmental performances. Under the optimal condition, the exergy efficiency, total product unit cost, and CO2 specific emission of the system are 63.77%, 36.37 $/GJ, and 298.77 g/kWh respectively, and the system can achieve the power output of 168.95 kW and cooling output of 12.48 kW. The SOFC accounts for the largest part (15.72%) of the total exergy destruction and achieves the highest cost rate (6.90 $/h) with a high exergoeconomic factor of 90.90%, indicating its capital investment can be reduced for improving system cost-effectiveness. © 2021 Elsevier Ltd

Keyword :

Carbon dioxide Cost effectiveness Economic and social effects Ejectors (pumps) Environmental management Exergy Investments Multiobjective optimization Refrigeration Solid oxide fuel cells (SOFC)

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GB/T 7714 Zhong, Like , Yao, Erren , Zou, Hansen et al. Thermo-economic-environmental analysis of an innovative combined cooling and power system integrating Solid Oxide Fuel Cell, Supercritical CO2 cycle, and ejector refrigeration cycle [J]. | Sustainable Energy Technologies and Assessments , 2021 , 47 .
MLA Zhong, Like et al. "Thermo-economic-environmental analysis of an innovative combined cooling and power system integrating Solid Oxide Fuel Cell, Supercritical CO2 cycle, and ejector refrigeration cycle" . | Sustainable Energy Technologies and Assessments 47 (2021) .
APA Zhong, Like , Yao, Erren , Zou, Hansen , Xi, Guang . Thermo-economic-environmental analysis of an innovative combined cooling and power system integrating Solid Oxide Fuel Cell, Supercritical CO2 cycle, and ejector refrigeration cycle . | Sustainable Energy Technologies and Assessments , 2021 , 47 .
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Numerical study on the airfoil self-noise of three owl-based wings with the trailing-edge serrations SCIE
期刊论文 | 2021 , 235 (14) , 2003-2016 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
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Previous publications have summarized that three special morphological structures of owl wing could reduce aerodynamic noise under low Reynolds number flows effectively. However, the coupling noise-reduction mechanism of bionic airfoil with trailing-edge serrations is poorly understood. Furthermore, while the bionic airfoil extracted from natural owl wing shows remarkable noise-reduction characteristics, the shape of the owl-based airfoils reconstructed by different researchers has some differences, which leads to diversity in the potential noise-reduction mechanisms. In this article, three kinds of owl-based airfoils with trailing-edge serrations are investigated to reveal the potential noise-reduction mechanisms, and a clean airfoil based on barn owl is utilized as a reference to make a comparison. The instantaneous flow field and sound field around the three-dimensional serrated airfoils are simulated by using incompressible large eddy simulation coupled with the FW-H equation. The results of unsteady flow field show that the flow field of Owl B exhibits stronger and wider-scale turbulent velocity fluctuation than that of other airfoils, which may be the potential reason for the greater noise generation of Owl B. The scale and magnitude of alternating mean convective velocity distribution dominates the noise-reduction effect of trailing-edge serrations. The noise-reduction characteristic of Owl C outperforms that of Barn owl, which suggests that the trailing-edge serrations can suppress vortex shedding noise of flow field effectively. The trailing-edge serrations mainly suppress the low-frequency noise of the airfoil. The trailing-edge serration can suppress turbulent noise by weakening pressure fluctuation.

Keyword :

flow control noise reduction owl trailing-edge serration

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GB/T 7714 Li, Dian , Liu, Xiaomin , Wang, Lei et al. Numerical study on the airfoil self-noise of three owl-based wings with the trailing-edge serrations [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING , 2021 , 235 (14) : 2003-2016 .
MLA Li, Dian et al. "Numerical study on the airfoil self-noise of three owl-based wings with the trailing-edge serrations" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING 235 . 14 (2021) : 2003-2016 .
APA Li, Dian , Liu, Xiaomin , Wang, Lei , Hu, Fujia , Xi, Guang . Numerical study on the airfoil self-noise of three owl-based wings with the trailing-edge serrations . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING , 2021 , 235 (14) , 2003-2016 .
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