Study on Flow Characteristics of Servo Valve Using CFD and Experiment
The 3D flow in real flow paths of a servo valve with direct force feedback is studied using computational fluid dynamics (CFD), and compared with actual servo valve measured data. Flow rate is computed together with mean pressures and shear forces acting on each spool face. The jet velocity angles and flow coefficients are computed for different spool displacements and pressure differentials. It is found that the CFD results show reasonably good agreement with the experimental results. The flow coefficient distribution of supply port values is slightly higher than return port values and they are also relatively insensitive to port pressure drop. The jet angles appear to be independent of spool opening. The jet angle at the main ports are close to the von-Mises theoretical value of 69°using momentum theory based on land face pressures, the assessed values from the simulation visual interpretation being around 77.5°. Shear stress forces contribute to less than 2％ of the axial force and could be neglected. The actual flow reaction forces varied linearly with port opening as anticipated but are less than those calculated using constant jet angle theory.
Servo valve Flow characteristics reaction force CFD Experiment
Chen Li X.Z.Zhu
Department of Mechanical Engineering, Liaoning University of Petroleum & Chemical Technology, Fushun, Liaoning 113001, P. R. China
国际会议
北京
英文
2007-08-05（万方平台首次上网日期，不代表论文的发表时间）