立式轴流泵装置飞逸过渡过程数值模拟

为了研究立式轴流泵装置飞逸过渡过程的水动力特性，以引江济淮工程派河口泵站为研究对象，采用Fluent 16.0与UDF二次开发程序相结合的数值模拟方法，对立式轴流泵装置的飞逸过渡过程进行了全流场数值计算，获得了机组在飞逸过渡过程中的转速、流量、扭矩、轴向力等外特性参数的变化以及肘形流道内流线的演化特性。研究结果表明：平均扬程下，泵装置飞逸转速约为218.99 r/min，与模型试验换算至原型的值215.33 r/min之间的相对误差为1.69%；飞逸过渡过程中水泵叶轮最大轴向力为225.93 kN，轴向力方向与重力方向相反，小于水泵叶轮自重342.12 kN，整个飞逸过渡过程中水泵机组不会发生“抬机”事故，飞逸过渡过程中肘形流道内出现了高度螺旋状的涡带。研究成果可为今后立式轴流泵装置的设计提供参考与借鉴。

Numerical simulation of runaway transient process of vertical axial flow pumps

In order to study the hydrodynamic characteristics of the runaway transient process of vertical axial flow pumps, taking Paihekou pump station in the Water Diversion Project from Yangtze River to Huaihe River as the research object, this paper simulated the runaway transient process of the vertical axial flow pump by using numerical simulation method, which combines the Fluent 16.0 software and UDF secondary development program. The variation of external characteristic parameters such as speed, flow rate, torque, axial force, and the evolution characteristics of streamline in elbow inlet conduit during the runaway transient process are obtained by numerical calculation. The results show that the runaway speed calculated by numerical calculation is 218.99 r/min under average head, and the relative error is 1.69% compared with runaway speed of 215.33r/min that is converted by model test. The maximum axial force of the impeller is 225.93 kN during the runaway transition, not greater than the impeller weight of 342.12 kN and the direction of the axial force is opposite to the direction of gravity. There is no “lifted” accident for pump units and a spiral vortex occurs in elbow inlet conduit during the runaway transient process. The research results provide references for the design of vertical axial flow pumps.