离心泵泄漏流转子动力学特性分析

Rotordynamic Analysis of Leakage Flow in Centrifugal Pump

摘要:

为研究泄漏流对离心泵转子振动特性的影响，以及计算由于离心泵前腔泄漏流作用在盖板上的不对称压力形成的涡动力，建立了离心泵前腔泄漏流模型，提出了一种研究离心泵前腔泄漏流诱导产生涡动力的数值计算方法。首先对离心泵进行全流场数值模拟，然后把其运算结果作为前泵腔单独数值模拟的初始条件，分析前腔流道内部流场的压力和速度矢量分布情况，并求出不同涡动频率比对应的法向和切向涡动力，最后运用最小二乘法对涡动力与涡动频率比之间的二次曲线进行拟合，求出全部6个转子动力学系数，结果表明数值模拟能较准确地计算出前腔泄漏流诱导产生的涡动力。

Abstract:

In order to study how the leakage flow affect the vibration characteristics of rotors in centrifugal pump and calculate the rotordynamic forces from the unsymmetrical pressures acting on the shroud, the front cavity leakage flow was modeled, and an analysis of numerical simulation of rotordynamic forces arising from the front cavity leakage flow was presented in a centrifugal pump. Firstly, numerical simulation of whole flow field was conducted on a centrifugal pump. Secondly, the simulated results was used as the initial conditions of numerical simulation of the front cavity, and the velocity and pressure distributions of the interior flow field of the front cavity passage were obtained and analyzed. Both normal and tangential rotordynamic forces for various whirl frequency ratios were calculated. Last, rotordynamic forces and all six rotordynamic coefficients were calculated via a second order curve fit, and the results showed that numerical simulation could accurately calculate the rotordynamic forces arising from the front cavity leakage flow.