摘要
针对高压差迷宫式多级降压调节阀内部迷宫盘片设计中如何确定盘片降压级数的核心技术问题,根据可压缩流体力学理论,对迷宫式调节阀内部盘片降压级数计算公式进行了推导和分析.并借助计算流体力学商业软件CFX,对3种不同降压级数盘片流道模型的内部流动进行了数值模拟计算,获得了不同级数流道内部的压力、速度分布等流场信息,同时绘制了不同级数模型内部的压力及速度变化曲线.分析结果表明:在相同工况下,增加盘片降压级数有利于合理逐级平稳降压,合理分配压降负担,使盘片中的流速平缓上升并降低流体出口能量.另外,当降压级数已能满足出口能量标准时,继续增加级数的作用相对较弱.研究结果可以为迷宫式调节阀及相关产品的研发提供一定的参考.
How to confirm depressurization stage number on disc is the key design problem for high pressure drop labyrinth control valve.According to the compressible fluid dynamic theory,the calculation formula of depressurization stage number on disc was deduced and analyzed.Numerical simulation of the internal flow in three path models with different stage number were performed by using commercial software CFX,and the distribution of pressure and velocity were obtained,while the changing curve were analyzed.The results show that increasing the stage number is beneficial to reach smooth depressurization and equally distribute pressure,as well as to reduce velocity and outlet energy.In addition,it's useless to increase the stage number if the path model has been satisfied with the outlet energy criteria.This study could be used as a reference for design of labyrinth control valve.
出处
《排灌机械工程学报》
EI
北大核心
2013年第12期1072-1076,共5页
Journal of Drainage and Irrigation Machinery Engineering
基金
重庆市技术创新项目(2012-01-026)
兰州理工大学"优秀青年教师培养计划"资助项目(Q201002)
关键词
迷宫式调节阀
曲折流道
降压级数
流速控制
数值模拟
labyrinth control valve
tortuous path
depressurization stage number
velocity control
numerical simulation
