液力变矩减速装置叶轮空转特性研究

液力变矩减速装置在不同工况下叶轮转速边界条件的确定是建立其CFD计算模型的基础，结合假设利用CFD模型确定了闭锁制动工况下导轮的状态，针对液力变矩减速装置牵引工况和制动工况下的叶轮空转现象，建立了CFD分析模型，应用析因设计与二次多项式拟合相结合的方法进行了叶轮空转转速的快速预测，确定了牵引工况下制动轮空转转速及制动工况下导轮空转转速边界条件，建立了液力变矩减速装置特性预测CFD模型，同时获得了泵轮转速与速比对稳态牵引工况下制动轮空转转速的影响规律，通过台架试验，验证了基于三维流动理论的牵引与制动特性预测仿真结果的准确性. 

Study on Idling Characteristics of Hydraulic Torque-Retarder Assembly

Definition of boundary conditions of hydraulic torque-retarder assembly (HTRA) in different working conditions is the basic of computational fluid dynamics (CFD). The performance of stator in locking condition was calculated by CFD based on some given hypotheses. In order to analyze the idling in traction and braking work condition of HTRA, combined with factorial design and quadratic-multinomial fitting, the prediction of rotation speed of brake impellers was obtained and the variation of brake impeller torque with impeller speed in traction condition was studied. In addition, the idling speed of stator impeller in braking condition was studied also. The prediction of traction and braking characteristics based on three-dimensional flow theory was verified feasibly and accurately by bench test.