偏导射流伺服阀前置级温度特性

Temperature Characteristics of Deflector Jet Servo Valve Pre-stage

利用Fluent软件对偏导射流伺服阀前置级流场进行三维数值模拟,对衔铁组件进行热流固耦合仿真模拟,根据模拟结果分析了入口油温不同时,左右接收腔压力、前置级液动力、黏性热效应以及各组件尺寸的变化情况。通过对比不同入口油温下流场的压力分布,发现温度升高会引起左右接收腔压力升高;左右接收腔压差随温度变化的曲线表明,前置级受到温度变化的作用后驱动性能有显著波动;基于仿真数据得到前置级横向液动力,表明温度升高会引起横向液动力的增大;流场温度分布表明,油液从入口到出口温度平均升高了约20.5℃;热流固耦合分析表明,反馈杆偏转板进出口面油液压差主要引起反馈杆弯曲变形,入口油液温度升高主要引起偏转板膨胀变形。

Using Fluent software to simulate the pre-stage flow field of deflector jet servo valve with three-dimensional model,and then the thermal fluid solid coupling simulation of armature assembly is carried out.Finally,according to the simulation results,the changes of the left and right receiving chambers pressure,pre-stage hydrodynamic force,viscous thermal effect and the size of each component are analyzed when the inlet oil temperature is different.By comparing pressure distribution of flow field at different oil temperatures,it is found that the temperature increase will cause the left and right receiving chambers pressure to increase.The pressure difference curve between the left and right receiving chambers with temperature indicates that the pre-stage driving performance has significant fluctuations after temperature changes.The pre-stage transverse hydraulic power is obtained based on simulation data,which indicates that the temperature increase will cause the increase of transverse hydraulic power.In addition,the temperature distribution of flow field shows that the oil temperature from inlet to outlet has increased by about 20.5℃on average.Further thermo-fluid-solid coupling analysis shows that the hydraulic pressure difference between the inlet and outlet surfaces of the deflection plate mainly causes bending deformation of the feedback rod,and the increase of inlet oil temperature mainly causes expansion deformation of the deflection plate.