滑阀V形阀口漩涡空化数值仿真分析

使用大涡模拟法(LES)模型、Mixture多相流模型及Schnerr-Sauer空化模型对滑阀V形阀口空化流场进行了数值仿真模拟。分析了V形滑阀在不同出口压力下的速度云图、压力云图和空穴形状,讨论了其中空化产生机制。结果表明:V形滑阀中空化主要分布在阀口上半部分和阀口后的阀腔中,阀口中的空化由流体漩涡运动的低压引起,阀腔中的空化由流体漩涡运动造成的压力脉动引起;无空化时阀腔中各处压力脉动主频一致,主频随入口压力降低而增大,空化出现后会破坏压力脉动的周期性。

Numerical Simulation Analysis of Vortex Cavitation in Spool Valve with V-shape Notch

Numerical simulations of the cavitation flow domain in the spool valve with V-shape notch were performed using the Large Eddy Simulation (LES) model, Mixture multiphase model, and Schnerr-Sauer cavitation model. The velocity contour, pressure contour, and cavitation shapes of V-shape notch spool valve at different outlet pressures were analyzed, and the cavitation generation mechanism was discussed. The results show that: the V-shape notch spool valve cavitation is mainly distributed in the upper of the notch and the valve chamber after the notch; the cavitation in the notch is caused by the low pressure of the fluid vortex motion, and the cavitation in the valve chamber is caused by the pressure fluctuation induced by the fluid vortex motion; the main frequency of pressure fluctuation is same in the valve chamber on non-cavitation conditions, and it increases as the outlet pressure decreases, and the periodicity of pressure fluctuation will be destroyed when cavitation occurs.