液力缓速器多相耦合瞬态流动机理研究

项目名称： 液力缓速器多相耦合瞬态流动机理研究

项目编号： No.51305156

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 李雪松

作者单位： 吉林大学

项目金额： 23万元

中文摘要： 目前国内外普遍采用的稳态流动方法对于液力缓速器流场内部的流动分离、涡旋、扩散等真实流动现象无法进行准确分析，且对于充放油这种动态过程无法进行有效确定。因此，本项目通过对液力缓速器进行传热理论研究,并考虑表面散热、冷却系统散热以及材料吸收热量等因素，研究液力缓速器冷却循环系统散热场流动与传热性能，分析不同充液率条件下液力缓速器内部流动特性，考虑多相流场的耦合关系，对液力缓速器内湍流流动进行三维瞬态流动分析；基于CFD技术,采用瞬态流场计算方法对液力缓速器充液过程进行研究，探索液力缓速器充液过程中流场内平均速率、总压强以及平均湍动能随时间变化的关系；研究多参数共同作用的非稳态流场中主要参数对缓速器制动性能的影响,考虑液力缓速器与整车之间的耦合关系，对液力缓速器主要结构参数进行集成优化，以提高汽车的综合性能。本项目具有重要的学术研究和推广应用价值，可为独立自主研发液力缓速器产品提供技术支撑。

中文关键词： 液力缓速器；热流耦合；流动可视化；多参数；集成优化

英文摘要： Now, some real flow phenomenons such as the flow separation in the internal flow field of hydraulic retarder, vortex, diffusion and so on can not be simulated accurately by the steady-state numerical simulation method which is generally used by domestic scholars, and also the dynamic process of oil-filling and discharging can not be calculated efficiently. Therefore, in this project, considering the factors of the surface heat dissipation, cooling system dissipation and the thermal absorption of the materials, the heat transfer theory of the hydraulic retarder will be studied, including the flow and the heat dissipation performance of the heat dissipation field in the cooling cycle system; Considering the coupling relationship between the multi-phase flows, the analysis on the internal flow performance in the hydraulic retarder will also be performed in this project, which involves the three-dimensional transient numerical simulation on the turbulent flow in the hydraulic retarder . Based on the CFD technology, The transient numerical simulation will be used to study the vary relationship with time of the average velocity, total pressure and average kinetic energy of turbulent flow during the oil charging process. Moreover, the effect on the braking performance of the retarder caused by the major parameters in

英文关键词： hydraulic retarder；heat-coupling；visualization of the flow；multiple parameter；integrated optimization