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基于气固两相流和冲蚀磨损理论,建立了笼套式节流阀岩屑运移模型,采用雷诺应力湍流模型和Grant、Tabakoff公式求解岩屑颗粒冲蚀速率。研究了阀芯0°、180°处冲蚀情况以及开度、安装角度对阀芯冲蚀的影响。结果表明:阀芯失效以局部冲蚀磨损为主,0°附近冲蚀严重,继而粒子沿环腔流动至背面180°附近,高速撞击反弹、冲蚀进入小孔;尤其小孔处于半开半闭状态,冲蚀异常严重。为减小冲蚀率,应避免在低开度工况下工作,安装时尽量使0°、180°面小孔数量居多,增大过流面积。
Based on gas-solid two-phase flow and erosion wear theory, the debris flow model of cage-type throttles was established. The Reynolds stress turbulence model and Grant and Tabakoff equations were used to solve the debris erosion rate. The effects of the erosion at 0 ° and 180 ° of the valve plug and the degree of opening and installation angle on the valve plug erosion were studied. The results show that the failure of the valve core is mainly caused by local erosion and erosion, and the erosion near 0 ° is serious. The particles then flow around the annular cavity back to 180 ° near the back. The high-speed impact bounces back and erodes into the small holes. In particular, Closed state, erosion is extremely serious. In order to reduce the erosion rate, it should be avoided to work under the condition of low opening. When installing, try to make the number of small holes of 0 ° and 180 ° mostly and increase the over-flow area.