双循环圆液力缓速器叶形设计方法

Blade design method of dual torus hydraulic retarder

为提高双循环液力缓速器制动功率密度,对其叶形设计方法开展研究.针对双循环液力缓速器弯叶片叶形结构特点,提出相切圆弧叶形设计法,以叶形包角与工作面圆弧半径为设计变量,建立叶形设计参数化模型.利用试验设计方法对不同叶形参数的双循环液力缓速器弯叶片进行实例设计,并与样机制动性能进行对比.结果表明:样机仿真与试验的制动力矩平均相对误差在5%以内,数值计算方法准确可靠;基于相切圆弧叶形设计法建立的弯叶片制动力矩变化范围较大,通过设定合适的叶形参数,缓速器制动性能可得到有效提高.

To improve the braking power density of dual torus hydraulic retarder,the design method of blade had been studied. The tangent-arc blade design method was proposed base on the structural feature of bowed blade. On the design variables of blade wrap angles and working radiuses,the parametric modeling of periodic flow was achieved. With the Design of Experiment method（ DOE）,the design examples were adopted to study the braking performance on different blade parameters. Comparison with braking performance of the prototype showed that the numerical method was accurate and reliable,the relative braking torque error between simulation and experiment was within 5%,and based on the tangent-arc blade design method,the braking torque of different blade parameters had a large range of variation. With the appropriate blade parameters,the braking performance could be effectively improved.