基于尺度解析模拟的HC375液力变矩器的流场分析与特性预测

针对传统的一维束流研究方法无法描述大功率液力变矩器工作腔内复杂的时变瞬态湍流的流动状态,采用多物理场耦合方法构建了一种介质流动与传热的动态耦合数值模型,并给出了液力变矩器瞬态仿真设计方法.通过定性和定量分析液力变矩器内部的流动结构发现,动态混合模型(Dynamic hybrid RANS - LES, DHRL)中的SBES(Stress -blended eddy simulation)方法能够充分识别工作腔内边界层的流动状态,可实现对多流域耦合复杂流动现象的精准捕捉.通过台架实验表明,采用DES模型和

Flow field analysis and characteristic prediction of HC375 hydrodynamic torque converter based onscale -resolving simulation

Aiming at the traditional one - dimensional beam research method can not describe the complex time -varying transient turbulent flow state in the working cavity of high -power hydrodynamic torque converter, the multi physical field coupling method is used to build the dynamic coupling numerical model of medium flow and heat transfer, and the transient simulation design method of hydrodynamic torque converter is given. Through the qualitative and quantitative analysis of the flow structure in the hydrodynamic torque converter, it is found that the SBES method in DHRL can fully distinguish the flow of boundary layer in the working cavity and accurately capture the complex flow phenomenon of multi flow domains coupling. The results of bench test show that the maximum error of external characteristics of hydrodynamic torque converter calculated by DES and SBES models is less than 6%, and they are significantly better than RANS and LES models. Therefore, the research results of this paper can provide a reference for efficient design and development of hydrodynamic torque converter.