高压差迷宫式调节阀的流道设计理论及模拟研究

Theory and Numerical Analysis of Passageway Design in High Pressure Drop Labyrinth Control Valve

以迷宫式多级降压调节阀为研究对象,运用理论研究与数值模拟相结合的方法,建立阀内流体模型,并依此对不同级数管道内流场的压降及流速分布进行模拟分析。结果表明:对于直流管道,随着级数的上升,流体经过每级造成的压降减小,使得压力最低点的数值会逐渐升高,直至高于闪蒸点;对于级数较高的直流管道,流体前期流速上升平缓,流速控制良好;渐扩管道相较于直流管道,每次经过转角的压降变化量都会有所减小,同种工况的渐扩管要优于直管道。

This paper takes the labyrinth multi-stage pressure reducing valve as the research object and uses the method of combining theoretical research and numerical simulation to establish a flow model to simulate the pressure drop and velocity distribution of the flow field in the pipeline with different stages analysis. The results show that for the direct current(DC)pipeline,the pressure drop of the fluid through each stage decreases with the rise of the series,and the pressure of the flow channel is effectively controlled to be higher than the flash point. For the higher series of direct current pipeline,the flow velocity of the fluid in the early stage rises gently,and the flow velocity is well controlled.Compared with the direct current pipe,the pressure drop variation of the gradually expanding pipe will decrease at each rotation angle,and the gradually expanding pipe under the same working condition is better than the straight pipe.