Journal of South China University of Technology(Natural Science Edition) ›› 2022, Vol. 50 ›› Issue (3): 95-105.doi: 10.12141/j.issn.1000-565X.210232

Special Issue: 2022年机械工程

• Mechanical Engineering • Previous Articles     Next Articles

Large Eddy Simulation Flow Field Analysis and Visualization Test Verification of Hydraulic Torque Converter Under Braking Condition

CHAI Bosen1,2,3 WANG Guangyi1 ZHU Guoren1 YAN Dong1 LU Zhenhua4 CHI Chengfang4   

  1. 1. School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130022, Jilin, China;
    2.State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, Jilin, China;
    3.Engineering Research Center of Ministry of Education of Contrution and Maintenance Equipment and Technology of Expressway, Chang'an University, Xi'an 710061, Shaanxi, China; 
    4. Jiangsu Hualongxing Mechanical Engineering Co.,Ltd., Wuxi 214023, Jiangsu, China
  • Received:2021-04-20 Revised:2021-05-31 Online:2022-03-25 Published:2022-03-01
  • Contact: 朱国仁（1965-），男，研究员，硕士生导师，主要从事机械设计及理论研究。 E-mail:zhugr@jlu.edu.cn
  • About author:柴博森（1984-），男，博士后，副教授，主要从事液力传动与流场可视化研究。E-mail：chaibs2012@jlu.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China （52075212），the Scientific Research Project of the Education Department of Jilin Province(JJKH20220977KJ)，the Exploration Foundation of State Key Laboratory of Automotive Simulation and Control（ascl-zytsxm-202010）,the Fundamental Research Funds for the Central Universities,CHD （300102251511）；the China Postdoctoral Science Foundation Funded Project（2018M641776），and the Jilin Province Postdoctoral Researcher Selected Funding Project（KF204039）

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Abstract: In order to accurately reveal the spatio-temporal evolution mechanism of the flow field of the hydraulic torque converter, five different Large Eddy Simulation models (SL, WALE, WMLES, WMLES S-Omega, KET) were used to simulate the three-dimensional flow field of hydraulic torque converter under braking conditions based on computational fluid dynamics theory. It identified and extracted the unsteady multiscale three-dimensional vortex structure inside the turbine, and then analyzed the characteristics of spatiotemporal multiscale vortex evolution and its influence laws on the evolution of flow field structure. Based on Particle Image Velocimetry (PIV) technology, dynamic real-time calibration method was used to measure the flow field inside the turbine of hydraulic torque converter. Based on the velocity and vorticity information extracted from the post processing, the simulation results of large eddy simulation were compared and the simulation applicability of five subgrid-scale turbulence models was analyzed. The results show that under braking conditions, the multiscale eddy simulation results of SL and WMLES models for the main flow area of the turbine channel are similar, the flow velocity ranges from 0.32m/s to 0.85m/s and the vorticity ranges from 250.77s-1 to 792.95s-1; for the turbine blade pressure surface near the wall high velocity area, the simulation results of WMLES model meet the PIV test results, the flow velocity ranges from 3.7m/s to 4.4m/s, while WMLES S-omega model is better for the simulation of vorticity field is better and the vorticity is 526.47s-1. From the perspective of three-dimensional vortex simulation, WMLES and WMLES S-omega models have more abundant numerical simulation results of three-dimensional vortex near the suction surface of blades, and they are more accurate in capturing small-scale vortex structures near the wall of blades. The KET model simulation results reproduce the obvious vortex shedding phenomenon at the turbine blade outlet, while other models are not accurate enough to identify the structure of three-dimensional vortex. The research results can provide theoretical guidance for high precision numerical simulation of hydraulic torque converter.

Key words: hydraulic torque converter, large eddy simulation, subgrid-scale, turbulence model, visualization test

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