双螺杆泵Ω形对称型螺杆流场数值分析

Numerical Analysis of Ω-Shaped and Symmetrical Screw Flow Field for Twin-Screw Pump

由于螺杆泵几何结构及流体流动状态较为复杂,其压力分布和速度等特性很难用数学解析法来分析计算。本文利用参数化设计模块建立双螺杆泵Ω形对称型螺杆三维模型,构建双螺杆流道的流场分析模型,运用有限元分析方法得出了双螺杆泵流道内压力场和速度场分布规律。结果表明:流体在流道中的流速分布具有规律性,整个流道的流场速度高低交替变化,在螺杆与衬套间隙处的流动为层流,螺旋面接触区内的流动为复杂的湍流,离螺杆啮合区近的螺旋槽内易发生涡流。本研究结果对于了解双螺杆泵螺杆工况下的性能情况具有重要的参考价值。

Because of the complex structure of the screw pump and fluid flow in the flow channel,the pressure distribution and velocity of the screw pump are very difficult to be analyzed by the method of mathematical analysis. In this paper,a three-dimensional model of the Ω-shaped and symmetrical screw of the twin-screw pump was established by using the parametric design model. The flow field analysis model of the twin-screw pump was constructed. The distribution law of the pressure field and velocity field was obtained by using the finite element analysis method. The results showed that the velocity distribution of fluid in the flow channel was regular,and the flow velocity of the whole flow field was changed,and the flow in the gap between the screw and the bush was laminar,and the flow in the spiral surface was complex,and the vortex flow in the screw groove was easy. The numerical analysis of the flow field has important reference value for understanding the performance of the twin screw pump under the condition of the screw pump.