基于液力变矩器流固耦合的叶片厚度设计方法

Design Method of Blade Thickness based on Fluid Structure Interaction of Hydrodynamic Torque Converter

摘要:

基于经验性流线公式的液力变矩器叶片厚度设计方法，因难以表达变矩器叶片与流体间的耦合变矩关系，易造成变矩器性能低下.针对此问题提出基于液力变矩器内流固耦合的叶片厚度设计方法，即以高精度流固耦合数值解析的液力变矩器性能为评价，在满足叶片应力强度与叶片厚度变化曲率约束下，推导出叶片厚度曲线方程.通过液力变矩器设计实例，显示液力变矩器叶片厚度分布与其流场分布具有强相关性，验证了此方法对提高液力变矩器变矩比、效率和动力性能的有效性，可作为液力变矩器叶片厚度设计的工程化设计参考流程.

Abstract:

Hydrodynamic torque converter blade thickness is traditionally determined by blade empirical streamline formula. However, this method fails to represent coupling torque variation between blades and fluid, and therefore easily results in poor performance of torque converter. Based on high precision fluid structure interaction(FSI) analysis of hydrodynamic torque converter, this paper proposes a blade thickness design by evaluating converter performance. Blade thickness curve is deduced on the condition of meeting the constraints of blades stress intensity and blades thickness curvature variation. In this paper, a hydrodynamic torque converter example demonstrates that blades thickness has a strong correlation with fluid field distribution. And this method is effective on improving torque ratio, efficiency and dynamic performance, and provides a reference workflow for hydrodynamic torque converter design in industry.