摘要
针对传统的一维束流研究方法无法对高功率密度液力变矩器工作腔内部复杂的时变瞬态湍流流动状态进行描述的问题,通过对计算流体力学(CFD)计算中的湍流模型进行设置,将RANS、LES、DES和SBES模型与精细六面体网格和介质动态物理化学特性进行高效的耦合集成,为液力变矩器(TC)瞬态仿真提供指导,以预测其外特性性能和复杂内流场分布。通过定性、定量分析液力变矩器内部的流动结构和导轮叶片边界层涡系拟序结构的时序演化,发现动态混合模型(DHRL)中的应力混合涡模拟(SBES)方法能够充分辨视工作腔内边界层的流动,实现了多流域耦合复杂流动现象的精准捕捉,并通过台架实验得到原始特性预测结果的最大误差不足4%。另外,本文还阐明了工作腔内流动损失产生机制,揭示了涡结构产生、发展、输运、破碎及合成等一系列主导湍流转捩过程的流动机制,为高效地开发新产品以及改进原有产品提供了计算方法。
The traditional one-dimensional beam research method cannot describe the complex timevarying transient turbulent flow in the working cavity of a high power density torque converter.RANS,LES,DES and SBES models are efficiently coupled with fine hexahedral grids and dynamic physicochemical properties of media by setting turbulence models in CFD calculation,which provides guidance for transient simulation of hydraulic torque converter(TC)to predict its external performance and complex internal flow field distribution.The stress-blended eddy simulation(SBES)method in dynamic hybrid rans-les(DHRL)was found by qualitative and quantitative analysis of the flow structure inside the hydraulic torque converter and the sequential evolution of the quasi-ordered vortex system in the guide vane boundary layer.The boundary layer flow in the working chamber can be fully identified,and the multibasin coupling complex flow phenomenon can be accurately captured.The maximum error of the original characteristic prediction results is less than 4%through the bench experiment.In addition,the mechanism of flow loss generation in the working chamber is also elucidated,and the flow mechanism of vortex structure generation,development,transport,fragmentation and synthesis is revealed,which provides a calculation method for the efficient development of new products and the improvement of original products.
作者
鄢万斌
杨孔华
金开雕
陈素姣
章勇华
刘春宝
YAN Wan-bin;YANG Kong-hua;JIN Kai-diao;CHEN Su-jiao;ZHANG Yong-hua;LIU Chun-bao(Research Institute of Transmission,Liugong Liuzhou Transmission Parts Co.,Ltd.,Liuzhou 545007,China;Guangxi Liugong Machinery Co.,Ltd.,Liuzhou 545007,China;School of Mechanical and Aerospace Engineering,Jilin University,Changchun 130022,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2024年第4期926-937,共12页
Journal of Jilin University:Engineering and Technology Edition
基金
吉林省科技发展计划项目(20210509007RQ)
柳州市科技计划项目(2021BAC0101)。
关键词
液力变矩器
尺度解析模拟
内流场
计算流体力学
hydraulic torque converter
scale-resolving simulation
flow field
computational fluid dynamics(CFD)
