U型和三角型减振槽对转套式配流系统空化的影响

为了了解不同减振槽结构对转套式配流系统空化产生的影响,设计了U型和三角型减振槽结构,通过Fluent仿真和试验方法研究2种结构下配流系统的空化特性,以确定空化特性最优的减振槽结构.并建立了配流系统的Singhal空化模型,仿真流体模型则考虑转套与泵腔之间的间隙,且以油液作为工作介质,分析在标定工况下和不同转速下配流系统的空化.试验在YST380W型液压综合试验台上进行,监测了不同转速下系统的容积效率,与仿真结果相互印证.仿真结果表明:2种减振槽的气体体积分数变化规律基本一致,U型减振槽的空化特性略优,且转速越大优势越明显;空化占比变化趋势和大小基本相同,U型减振槽优势随着转速的升高越来越明显;容积效率均随转速的升高先增大再减小,U型减振槽的容积效率高于三角型减振槽.对U型减振槽结构系统容积效率试验,仿真误差大约为2%.

Influence of U-shaped and triangular damping groove on cavitation of distribution system with rotary sleeve

In order to understand the influence of different damping groove structures on the cavitation distribution system with rotary sleeve.Two types of U and triangle damping groove were designed.The cavitation characteristics of the distributing flow system with the two damping groove were studied by numerical simulation and experiment to determine the best cavitation under the optimal damping groove structure.The Singhal cavitation model of the distributing flow system was established.The fluid model in the simulation considers the gap between the rotating sleeve and the pump chamber and uses oil as the working medium to explore the cavitation under standard conditions and different speeds.The experiment was carried out on the YST380W hydraulic comprehensive experiment bench,and the volumetric efficiency of the system at different speeds was monitored,which was consistent with the simulation results.The simulation results show that the change of gas volume fraction with of the two damping grooves are basically the same and the cavitation of the U type damping groove are slightly better,and the greater the speed,the more obvious the advantage;the tendency and size of the cavitation ratio are basically the same,and the advantage of the U type damping groove becomes more and more obvious as the speed increases.The volumetric efficiency first increases and then decreases with the increase of the speed,and the volumetric efficiency of U type damping groove is higher than that of the triangle dam-ping groove.The simulation error is about 2%for the volumetric efficiency experiment of the U type damping groove system.