双螺杆液体泵双头全光滑螺杆的流场特性研究

Investigation on Flow Field Characteristics of Double-tooth Full-smooth Screw in Twin Screw Pump

针对双螺杆液体泵的内部流场比较复杂,建立双螺杆液体泵的三维模型,采用三维结构化网格对模型进行网格划分,加密啮合间隙处的网格,从而准确、清晰地反应泵内流场的流动特性和流场分布规律。研究结果表明:双螺杆液体泵内压力呈阶梯状分布,转子啮合间隙处高低压交替分布;螺杆转子之间的法向间隙处存在Z轴泄漏速度的最大值,是主要的泄漏位置。研究结果为优化螺杆转子的设计提供依据。

In view of the complicated internal flow field of twin-screw liquid pump,a three-dimensional model of twin-screw liquid pump was established. The three-dimensional structured grids were used for grid division of the model,and make the number of grids at the meshing clearance dense so as to more accurately and clearly reflect the flow field characteristics and distribution in the pump. The research results show that the pressure in the twin-screw liquid pump presents ladder-like distribution,and the high and low pressure are alternately distributed at the rotor meshing clearance. The maximum leakage rate on Z-axis exists at the normal clearance between the screw rotors,which is the main leakage location. The results of present study provide the basis for optimizing the design of screw rotors.