一种新型液力缓速器内部流道特性研究

提出一种新型液力缓速器应用于非驱动桥,以车轮主轴运动为动力源,实现整体缓速系统的辅助制动.对液力缓速器的整体及泵轮、 涡轮的机械结构进行了设计;基于已建立的流道模型,利用一维束流理论对流体在流道的运动速度进行求解,获得液体在流道内的湍流运动形式;分别对叶片数目不同的流道进行了仿真求解与对比,进而获得较佳的叶片数目;通过采用大涡模拟并结合可动区域耦合计算的滑动网格法,对不同充液量下液力缓速器的缓速性能进行了研究,进一步对该新型液力缓速器的缓速性能进行了验证,为深入开展该项研究提供了数据支持与理论依据.

Research on Characteristics of Internal Flow Channel of a New Kind of Hydraulic Retarder

The hydraulic retarder applied on non driving axle of auxiliary braking system is a new kind of mechanical system pro-posed.The hydraulic retarder was driven by rear axle of the trailer to realize the auxiliary brake of automotive retarding speed system. The whole retarder and the mechanical structure of pump and turbine wheel were designed.Based on the model of the flow channel con-structed, the flow sport velocity of the flow channel was solved by using the one-dimensional (1D) flow theory, so the form of turbulent motion of the internal flow channel was obtained.Different number of leaf blades of the flow channel were solved with simulation and compared separately, and the most suitable number for the leaf blades of the hydraulic retarder was further obtained.The retarding per-formance under different amounts of liquid filling in the hydraulic retarder was also researched by using the combination of the methods of large eddy simulation and sliding grid of movable region coupling calculation, so the retarding abilities for the new kind of hydraulic retarder proposed were proved.Based on what discussed above, a data support and theoretical basis are provided for further research on the new kind of hydraulic retarder.