叶片泵入流畸变的研究现状与展望

Development and Prospect of Inflow Distortion of Pump

入流畸变是各种叶片泵入口来流的普遍现象,其本质问题在于入口处流场的不对称性。在高温、高压、高转速和大流量情况下,入流畸变对泵的影响不容忽视,传统设计的均匀入流假设已经不能满足实际要求。在分析叶片泵入流畸变来源及形式的基础上,笔者论述了激光多普勒测速和粒子成像测速实验方法在研究中的应用,以及直接模拟计算法、大涡模拟法和雷诺时均法等计算方法在研究中的作用,进一步分析了入流畸变对泵相关特性的影响。提出今后可从高温工况下温度场的影响、入流畸变内部流体流动规律与泵性能的定量关系等方面进行研究,对于核设备中的冷却水泵、轻工用泵等的研究工作具指导作用。

Harmful inlet situation-inflow distortion exists in field of rotating fluid machinery like pumps which is mainly caused by the asymmetric inlet flow field. In specific situations such as high temperature,high pressure,high speed and high volume mass flow,the influence of inflow distortion cannot be neglected. The uniform inflow hypothesis in traditional design cannot meet the practical requirements now. The mainstream researching methods about the inflow distortion were introduced, including experimental measurements( laser Doppler velocity and particle imaging velocimetry,etc.) and numerical simulation( direct numerical simulation,large eddy simulation and Reynolds average navier-stokes),for further analysis of the inflow distortion characteristics related to the pump. The research can start with the influence of high temperature field,the quantitative relationship between fluid flow pattern of inflow distortion and pump performance,which is instructional for the research of cooling water pump in the nuclear equipment and the pump used in light industry.