二级管道节流过程中气蚀数值模拟

Numerical Simulation of Cavitation in Throttling Process of Secondary Pipeline

为了研究节流管道有气蚀、能量损失大、噪声大等问题,按照实际流道的结构和参数,自行设计二级节流管道三维模型.应用流场计算商用软件ANSYS对多种工况下二级节流管道和普通节流管道进行仿真计算,给出节流管道内的速度场分布图、压力场分布图.分析实验测量结果,验证计算模型的适用性.研究结果表明二级节流管道抗气蚀能力比普通节流管道强.气穴首先在节流管道入口处产生,并随着两端压差的增大向出口推移.研究结果对节流管道的选择设计具有一定的参考意义.

In order to study the phenomenon of cavitation and solve energy losses and high noise problems of throttle in tube,conical valve structure was improved and the throttle in tube was designed by ourselves according to actual valve structure and parameters.Through the commercial software ANSYS＇ simulation of many conditions of the throttle valve（ordinary and cone）,the distribution of velocity and pressure field were showed.By analyzing numerical results,the calculation model was verified and some rules of velocity and pressure were obtained.The simulation proved that throttle in tube had bigger stiffness,smaller air-pocket coefficient and higher cavitation ability.Cavitation first emerged at the entrance of throttle in tube,and elapsed to the entance with differential pressure increasing.Thus it provided a useful reference for other valve designs.