液力缓速器变叶片数的三维数值模拟

Numerical simulation of hydraulic retarder with different blade number

将液力缓速器动静结合面定义为内部边界,解决了流体出入口在同一平面内的问题.利用Fluent软件对不同叶片数的液力缓速器的内流场进行数值模拟,计算采用雷诺时均方程和k-ε湍流模型,计算结果显示了液力缓速器不同叶片数下的速度分布、压力分布规律,并对流场内部流动进行了分析和研究.结果表明,随着叶片数的增加,进出口面速度的大小有先增大后减小趋势.轴面流道涡旋范围先增加后逐渐减小;而叶片吸力面的低压区逐渐扩大;叶片数为36时压力面的静压分布最均匀.

The interface between rotator and stator was defined as interior boundary in hydraulic retarder which effectively solved the problem of inlet and outlet in the same plane for fluid flow. By using the time-averaged N - S equation and the standard k - ε turbulence model, the internal characteristics of flow with different blade number were simulated. Different velocity and pressure distributions of the hydraulic retarder with different blade numbers were obtained. The results show that, with the blade number increasing, the velocity firstly increases and then decreases in the interface, so does the degree of whirlpool. The meiobar area tends to increase. The static pressure in pressure side is distributed most uniformly with 36 blade number.