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Influence of Charging Oil Condition on torque converter Cavitation Characteristics

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Chinese Journal of Mechanical Engineering 2022年第3期35卷 236-249页

作者： Cheng Liu Meng Guo Qingdong Yan Wei Wei School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Chongqing Innovation Center Beijing Institute of TechnologyChongqing 401122China Advanced Technology Research Institute Beijing Institute of TechnologyJinan 250307China

Cavitation inside a torque converter induces noise,vibration and even failure,and these effects have been disregarded in previous torque converter design ***,modern torque converter applications require attention to this issue because of its high-speed and high-capacity ***,this study investigated the cavitation effect on a torque converter using both numerical and experimental methods with an emphasis on the influence of the charging oil feed location and charge *** fluid dynamics(CFD)models were established to simulate the transient cavitation behaviour in the torque converter using different charging oil pressures and inlet arrangements and testing against a base case to validate the *** CFD results suggested that cavitating bubbles mainly takes place in the stator of the torque *** transient cavitation CFD model yielded good agreement with the experimental data,with an error of 7.6%in the capacity constant and 7.4%in the torque *** the experimental and numerical studies showed that cavitation induced severe capacity degradation,and that the charge pressure and charging oil configuration significantly affects both the overall hydrodynamic performance and the fluid behaviour inside the torque converter because of *** the charge pressure and charging the oil from the turbine-stator clearance were found to suppress cavitation development and reduce performance degradation,especially in terms of the capacity *** study revealed the fluid field mechanism behind the influence of charging oil conditions on torque converter cavitation behaviour,providing practical guidelines for suppressing cavitation in torque converter.

关键词： torque converter Cavitation CFD Transient flow

Flow Through Aerodynamic torque converter Installed in New Type Turbofan Engine

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Journal of Thermal Science 2007年第1期16卷 14-18页

作者： Toshiaki Kanemoto Dai Sakihama Seita Seki Ahmed Mohamed Galai FengQin Hant YeXiang Xiao Kyushu Institute of Technology： Sensui 1-1 Tobata Kitakyushu 804-8550 Japan South China University of Technology 381 WuShan Road Guangzhou China

It is desired to increase the core engine speed of the turbofan, to get the best efficiency for the next leap of the engine technology. The conventional mechanism in which the front fan is directly connected to the output shaft of the core engine has a limit of increasing the spool speed because the fan diameter is very large. The authors have proposed a new driving system in which the front fan is driven through the aerodynamic torque converter. The front fan can work at the conventional speed while the core engine runs more efficiently at higher speed. Continuously, in this paper, the flow through the converter is simulated numerically by CFX-5 with the k-εturbulence model of the commercial CFD code. The secondary flow occurred on the hub wall affects markedly the flow condition on the blade surfaces, and the flow along the suction surface of the driver blade separates near the trailing edge, which is deviated to the blade tip by the centrifugal force due to the wheel rotation.

关键词： turbofan engine torque converter front fan numerical simulation secondary flow separation

Performance Analysis and Improvement of Flat torque converters Using DOE Method

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Chinese Journal of Mechanical Engineering 2018年第4期31卷 101-109页

作者： Guang-Qiang Wu Jie Chen Wen-Jie Zhu School of Automotive Studies Tongji University Institute of Industrial Science The University of Tokyo

Automotive torque converters have recently been designed with an increasingly narrower profile for the purpose of achieving a smaller axial size and reducing weight. Design of experiment(DOE) and computational fluid dynamics(CFD) techniques are applied to improve the performance of a flat torque converter. Four torque converters with different flatness ratios(0.204, 0.186, 0.172, and 0.158) are designed and simulated first to investigate the effects of flatness ratio on their overall performance, including efficiency, torque ratio, and impeller torque factor. The simulation results show that the overall performance tends to deteriorate as the flatness ratio decreases. Then a parametric study covering six geometric parameters, namely, inlet and outlet angles of impeller, turbine, and stator is carried out. The results demonstrate that the inlet and outlet angles play an important role in determining the performance characteristics of a torque converter. Furthermore, the relative importance of the six design parameters is investigated using DOE method for each response(stall torque ratio and peak efficiency). The turbine outlet angle is found to exert the greatest influence on both responses. After DOE analysis, an optimized design for the flat torque converter geometry is obtained. Compared to the conventional product, the width of the optimized flat torque converter torus is reduced by about 20% while the values of stall torque ratio and peak efficiency are only decreased by 0.4% and 1.7%, *** proposed new optimization strategy based on DOE method together with desirability function approach can be used for performance enhancement in the design process of flat torque converters.

关键词： torque converter Flatness ratio Computational fluid dynamics(CFD) Parametric study Design of experiment(DOE)

Fluid-solid interaction analysis of torque converters

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High Technology Letters 2019年第3期25卷 239-244页

作者： Zhang Zeyu Hui Jizhuang Suo Xuefeng Zhang Fuqiang Lei Jingyuan National Engineering Laboratory for Highway Maintenance Equipment Chang’an University

In order to extend the service life of torque converters, it is essential to predict the pressure condition and improve its weak areas. According to computational fluid dynamics and structural statics, a model of torque converter is constructed using software ANSYS. Then, a fluid-solid interaction(FSI) analysis method is proposed to obtain its stress distribution, in which the fluid pressure is applied to the coupling surface to calculate the interaction between fluid and solid. The results show that the fluid pressure at the inlet of the impeller is maximum and decreases along the flow direction, the pressure at the inlet of the turbine blade is minimum and the outlet pressure is the largest, increasing along the flow direction gradually;the pressure distribution of the impeller is concentrated mainly at the corner, especially between the inner ring and the impeller blades;the pressure of the turbine is concentrated mainly on the connection between turbine and the outer edge of the blade.

关键词： torque converter fluid-solid interaction(FSI) stress distribution pressure analysis simulation

Transient dynamic analysis and comparison on wedging processes of overrunning clutches with different contact surfaces

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Journal of Beijing Institute of Technology 2015年第2期24卷 207-212页

作者：魏巍周洽刘树成闫清东 School of Mechanical Engineering Beijing Institute of Technology

The effects of contact surface on dynamic wedging behavior of the roller and inner-ring of the overrunning clutch in a dual-turbine torque converter were investigated to reveal the friction self- locking mechanism and dynamic process. Planar strain clutch models including roller, inner-ring and outer-ring were built, and transient wedging process was analyzed with an explicit dynamics meth- od. The modeling of stress and strain distribution and variation of two kinds of contact surfaces show that there are three stages named slipping, wedging and binding respectively during whole wed- ging process. Meanwhile the geometric structures of contact surfaces greatly influence the peak stress and strain distribution of the wedging process of the roller and inner-ring. The load bearing performance of contact surfaces with logarithmic spiral curve is better than that with straight line. Our study provides theoretical foundation for design and further optimization of wedging contact surface of an overrunning clutch in a dual-turbine hydrodynamic torque converter.

关键词： overrunning clutch wedging process explicit dynamics torque converter