Thermal effect on cavitation characteristics of a hydraulic torque converter

空化 变矩器 扭矩 液压油 机械 粘度 流量(数学) 体积热力学 材料科学 水力机械 物理 复合材料 热力学
作者
Meng Guo,Cheng Liu,Jiahua Zhang,Shiqi Liu,Qingdong Yan,Boo Cheong Khoo
出处
期刊:Numerical Heat Transfer Part A-applications [Taylor & Francis]
卷期号:82 (1-2): 31-52 被引量:4
标识
DOI:10.1080/10407782.2022.2078613
摘要

The performance of torque converters, which use hydraulic oil as the working medium to transmit power, are severely affected by the operating temperature because various oil properties, such as viscosity, density and saturated pressure, vary drastically with temperature change. To study the thermal effect on the cavitation characteristics of viscous oil, we developed a full flow passage geometry and computational fluid dynamics (CFD) model with cavitation based on the finite volume method (FVM) to predict and analyze cavitation behavior and thermal effect in a torque converter. The results show that the critical cavitation number and critical cavitation temperature of the tested torque converter are 9.2 and 30 °C, respectively, and increasing the temperature reduces the cavitation number and induces the generation and intensification of cavitation. Besides, although higher temperature improves the transmission efficiency and capacity constant of the torque converter, it greatly magnifies the influence of cavitation on the hydrodynamic performance. In severe cases, it reduces the hydraulic performance by 9.3% and the flow velocity by 11.8% at 100 °C. Meanwhile, the cavitation flow field and the configuration of cavitation are also greatly affected by temperature. About 11.9% of the surface of the stator blade was covered by cavitation bubbles with the vapor volume fraction of 88.1% at 100 °C. Moreover, 30–60 °C is the optimum operating temperature range in terms of cavitations effect with no pronounced cavitation occurrence or that the cavitation degree is too weak to affect the performance in the mentioned temperature range.
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