Theoretical Model of Dynamic Bulk Modulus for Aerated Hydraulic Fluid

作     者：Xiaoming Yuan Weiqi Wang Xuan Zhu Lijie Zhang Xiaoming Yuan;Weiqi Wang;Xuan Zhu;Lijie Zhang

作者机构：Hebei Key Laboratory of Heavy Machinery Fluid Power Transmission and ControlYanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and ScienceMinistry of Education of ChinaYanshan UniversityQinhuangdao 066000China State Key Laboratory of Fluid Power and Mechatronic SystemsZhejiang UniversityHangzhou 310027China 

出 版 物：《Chinese Journal of Mechanical Engineering》 (中国机械工程学报（英文版）)

年 卷 期：2022年第35卷第5期

页      面：183-193页

核心收录：

学科分类：08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0802[工学-机械工程] 

基　　金：National Natural Science Foundation of China(Grant Nos.52175066,51805468) Hebei Provincial National Natural Science Foundation of China(Grant No.E2020203090) Science and Technology Project of Hebei Education Department of China(Grant No.ZD2022052) Open Foundation of the Key Laboratory of Fire Emergency Rescue Equipment of China(Grant No.2020XFZB07). 

主　　题：Aerated hydraulic fluid Dynamic bulk modulus Theory model Air fraction Pressure 

摘      要：Existing models of bulk modulus for aerated hydraulic fluids primarily focus on the effects of pressure and air fraction,whereas the effect of temperature on bulk modulus is disregarded.Based on the lumped parameter method and the full cavitation model,combined with the improved Henry’s law and the air polytropic course equation,a theoretical model of dynamic bulk modulus for an aerated hydraulic fluid is derived.The effects of system pressure,air fraction,and temperature on bulk modulus are investigated using the controlled variable method.The results show that the dynamic bulk modulus of the aerated hydraulic fluid is inconsistent during the compression process.At the same pressure point,the dynamic bulk modulus during expansion is higher than that during compression.Under the same initial air faction and pressure changing period,a higher temperature results in a lower dynamic bulk modulus.When the pressure is lower,the dynamic bulk modulus of each temperature point is more similar to each other.By comparing the theoretical results with the actual dynamic bulk modulus of the Shell Tellus S ISO32 standard air-containing oil,the goodness-of-fit between the theoretical model and experimental value at three temperatures is 0.9726,0.9732,and 0.9675,which validates the theoretical model.In this study,a calculation model of dynamic bulk modulus that considers temperature factors is proposed.It predicts the dynamic bulk modulus of aerated hydraulic fluids at different temperatures and provides a theoretical basis for improving the analytical model of bulk modulus.