阀芯旋转式高速开关阀的气穴特性研究

Research of Cavitation Characteristics for a Rotary High Speed On-Off Valve

提出一种阀芯旋转式高速开关阀,通过阀芯旋转实现高速开关,突破阀芯往复运动结构对开关频率的限制。在此基础上,建立阀内流体模型,利用Fluent软件对不同运动和结构参数下阀口的气穴现象进行数值模拟及量化分析。结果表明:气穴现象主要发生在靠近阀芯沟槽一侧,随旋转角度的增加而减小;气穴范围和气相体积分数的下降速度随出口压力的增加而增大,当出口压力为5 MPa时,气相体积分数迅速下降并在旋转角度为3°时趋于0;改变占空比,气穴未有明显变化;增大阀口流道的倾斜角度,气穴抑制效果显著,可提高输出流量的稳定性。

A kind of high speed on-off valve with valve core rotation was put forward,which could break through the restriction of spool reciprocating motion structure on the switching frequency through the spool rotation to achieve high speed switching.Based on this,the fluid model in the valve was established,and the cavitation phenomena of the valve orifice under different motion and structure parameters were numerical simulated and quantified by using Fluent software.The results show that the cavitation mainly occurs near the groove side of the valve core,and it decreases with the increase of the rotation angle;the decline rates of cavitation range and gas phase content increase with the increase of outlet pressure,when the outlet pressure is 5 MPa,the gas content decreases rapidly and tends to zero when the rotation angle is 3°;there is no obvious change in the cavitation phenomenon when the duty cycle is changed;increasing the inclination angle of the orifice port,the cavitation inhibition effect is significant and the stability of the output flow can be improved.