【摘要】 针对射流管伺服阀对油液清洁度要求低以及油液中固体颗粒物高速射流容易产生零件磨损的问题,进行冲蚀磨损数值模拟.采用计算流体动力学(CFD)与冲蚀理论,建立冲蚀磨损数学模型,模拟射流管伺服阀多相流中油液和固体颗粒物的运动轨迹.分析离散相固体颗粒的速度和冲击角度等参数对射流管伺服阀冲蚀磨损的影响规律,得到在工作介质为7级清洁度时射流管伺服阀前置级部件的冲蚀磨损率以及冲蚀磨损量.以某工业现场已服役5年的CSDY型射流管伺服阀作为实验对象,进行实验结果和理论结果的对比分析.研究结果表明:高速射流容易导致射流管伺服阀部件出现增重或失重的现象;油液中的固体颗粒物使接受器劈尖产生较严重的冲蚀磨损,冲蚀磨损量与2个接收孔之间的夹角及射流管位移量有关,当夹角为40°~50°时,冲蚀磨损相对较为严重.当射流管处于中立位置时,即射流管位移量为零时,劈尖附近冲蚀磨损严重;当射流管位移为最大时,劈尖的冲蚀磨损最小,理论结果与实验结果一致.更多还原

【Abstract】 Numerical simulation of erosion wear was taken aiming at the problem of the low requirements on oil liquid cleanliness of jet pipe servo valve and that the high speed jet of solid particles in the oil can easily lead to parts erosion. The mathematical model of erosion wear was established by using computational fluid dynamics(CFD)and erosion theory.The motion trajectory of solid particles in the multiphase oil of jet pipe servo valve was simulated,and the effect rule of the velocity and impact angle of the discrete phase solid particles on erosion of jet pipe servo valve were obtained.The erosion rate and quantity of the pre-stage of jet pipe servo valve were analyzed when the working oil was grade 7pollution.The type of CSDY jet pipe servo valve,which was served in an industrial scene for 5years,was used as the experimental object.The experimental results and the theoretical results were compared and analyzed.Results show that high speed jet flow can easily cause the parts of jet pipe servo valve weight gain or loss.The particle in the oil cause a serious erosion wear on the wedge of receiver,and the erosion amount is related to the angle between the two receiving holes and the displacement of the jet pipe.When the angle was 40°to 50°,the erosion wear was relatively serious.As the jet pipe was in medium position,that was,the displacement of the jet pipe was zero,serious erosion also happened around the wedge of receiver.When the jet pipe’s displacement was maximum,the minimum erosion happened in the wedge of receiver.As a result,the theoretical results were in agreement with the experimental results.更多还原