煤矿水液压支架安全阀阀腔气蚀特性研究

针对煤矿水液压支架安全阀的严重气蚀问题，建立了阀腔CFD多相流模型，研究了阀腔流场的压力与气相分布特性，分析了阀芯结构参数(阀口排数、阀口个数、孔间距、孔径)对重要阀口过流截面气蚀特性的影响规律，并优化了阀腔结构参数。研究表明：当阀芯为两排阀口、阀口数为16个、孔径为1.4mm、孔间距为8mm时，最大气相体积分数降低了19.4%，对气蚀的产生有抑制作用。

Analysis of Cavitation Characteristics of Safety Valve Core of Coal Mine Water Hydraulic Support

Aiming at the serious cavitation problem of mine water hydraulic support safety valve, a CFD multi-phase flow model of valve chamber was established. The pressure and gas phase distribution characteristics of valve chamber flow field were studied. The influence of valve core structure parameters (valve outlet row number, valve outlet number, hole spacing, hole diameter) on the cavitation characteristics of important valve orifice overflow section was analyzed, and the structure parameters of valve chamber were optimized. The results show that the maximum volume fraction of vapor phase decreases by 19.4% when the spool is two rows of orifices, the number of orifices is 16, the diameter of orifices is 1.4 mm and the spacing of orifices is 8 mm, which can inhibit the formation of cavitation erosion.