摘要
利用动网格技术,对单座调节阀阀内压力场、速度场和空化区域进行研究。结果表明:在阀门关闭过程中,阀芯边缘与阀口内壁之间的间隙易出现负压区,随着阀门开度减小,负压区呈先增大后减小的趋势;随着阀门开度的减小并在流体粘性阻力的作用下,通过阀口处的流体速度呈先增大后减小的趋势;在大开度时,下游壁面附近回流区易发生相变进而出现空化,随着阀门开度的减小,空化区域转移到阀芯边缘与阀口内壁之间的间隙处,含气率呈先增大后减小的趋势;对比动态和稳态的模拟结果,两者基本一致。
Making use of the dynamic mesh technology to research the pressure field,velocity field and cavitation area in a single seat control valve was implemented.The results showed that,in the process of valve closing,the gap between the edge of the valve core and the inner wall of the valve mouth is prone to a negative pressure zone,which increases first and then decreases with the decrease of valve opening;with the decrease of valve opening and the action of fluid viscous resistance,the fluid velocity through the valve mouth increases first and then decreases;as for the large opening,the backflow area near the downstream wall is prone to both phase transition and cavitation;with the decrease of the opening of the valve,the cavitation area is transferred to the gap between the edge of the valve core and the inner wall of the valve mouth,and the gas fraction increases first and then decreases.Comparing the results at dynamic condition and at steady state showed that the results coincide with each other basically.
作者
张希恒
王宇
张孙力
ZHANG Xi-heng;WANG Yu;ZHANG Sun-li(College of Petrochemical Engineering,Lanzhou University of Technology)
出处
《化工机械》
2021年第4期542-545,560,共5页
Chemical Engineering & Machinery
关键词
调节阀
动网格
空化
阀门开度
数值模拟
control valve
dynamic mesh
cavitation
valve opening
numerical simulation
