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学者姓名：席光
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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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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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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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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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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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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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Abstract ：
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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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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The periodic unsteady natural convection flow and heat transfer in a square enclosure containing a heated circular cylinder with different vertical locations is numerically studied. The temperature of the enclosure keeps lower constant while the temperature of the inner circular cylinder oscillates periodically with time at higher averaged value, the natural convection in the enclosure is driven by the temperature difference. The two-dimensional natural convection is simulated with high accuracy temporal spectral method and local radial basis functions method at Rayleigh number Ra = 10(5). The location of inner circular cylinder varies from -0.25 to 0.25 vertically, the temperature pulsating amplitudes are a = 0.5, 1.0 and 1.5 and the temperature pulsating period ranges from 0.01 to 100. Numerical results show that the heat transfer is strongly dependent on the vertical location and the pulsating temperature of inner cylinder. The heat transfer is enhanced generally for the time-periodic unsteady natural convection comparing with its steady state natural convection, and the local maximum heat transfer rate is observed for some locations. Moreover, the phenomenon of backward heat transfer is discussed and the quantity of back heat transfer rate is presented. Finally, the influence of the vertical locations and pulsating temperature on the unsteady fluid flow and heat transfer are discussed and analyzed.
Keyword ：
Backward heat transfer Different vertical locations Heat transfer enhancement Time-periodic natural convection Time pulsating temperature
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| GB/T 7714 | Wang, Zhiheng , Wang, Tongsheng , Xi, Guang et al. Periodic unsteady natural convection in square enclosure induced by inner circular cylinder with different vertical locations [J]. | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2021 , 124 . |
| MLA | Wang, Zhiheng et al. "Periodic unsteady natural convection in square enclosure induced by inner circular cylinder with different vertical locations" . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 124 (2021) . |
| APA | Wang, Zhiheng , Wang, Tongsheng , Xi, Guang , Huang, Zhu . Periodic unsteady natural convection in square enclosure induced by inner circular cylinder with different vertical locations . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2021 , 124 . |
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In order to solve the environmental pollution problem caused by winter heating of rural residential building in northern of China, in this paper a biomass gasification (BG)-solid oxide fuel cell (SOFC) combined heat and power (CHP) system has been establishedand numerically investigated. Taking a rural village around Xi'an which is an ancient city and located at central of northern China as the study object, according to heat and electricity output of the system and the heating and electrical load characteristics of the residential building of village, the energy saving ratio and economical efficiency of the CHP system under three different operation schemes compared with the traditional energy system have been analyzed. The results show that the operation scheme for heating designated rooms in rural buildings and meeting the average heat demand of users is the most energy-efficient and economical way. The primary energy saving rate and annual cost saving rate can reach 18.0% and 10.3%, respectively. When the user's heat and power load demand is clear, the closer the system's output heat and power ratio to the user's heat and power load ratio, the more significant the system's energy saving effect.
Keyword ：
biomass gasification combined heat and power system operation scheme performance analysis solid oxide fuel cell
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| GB/T 7714 | Dang, Zheng , Jiang, Zhaoyi , Ma, Jinyan et al. Numerical Study on the Performance of a Cogeneration System of Solid Oxide Fuel Cell Based on Biomass Gasification [J]. | FRONTIERS IN ENERGY RESEARCH , 2021 , 9 . |
| MLA | Dang, Zheng et al. "Numerical Study on the Performance of a Cogeneration System of Solid Oxide Fuel Cell Based on Biomass Gasification" . | FRONTIERS IN ENERGY RESEARCH 9 (2021) . |
| APA | Dang, Zheng , Jiang, Zhaoyi , Ma, Jinyan , Shen, Xin , Xi, Guang . Numerical Study on the Performance of a Cogeneration System of Solid Oxide Fuel Cell Based on Biomass Gasification . | FRONTIERS IN ENERGY RESEARCH , 2021 , 9 . |
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