含气油液有效体积弹性模量理论模型研究  

Research on Theoretical Model for Effective Bulk Modulus of Air-liquid Mixtures of Hydraulic Oil

作　　者：唐东林[1] 吴凡[1] 贾品元 曾志春[1] 

机构地区：[1]西南石油大学机电工程学院,成都610500 [2]中国石油长庆油田公司第五采油厂,西安710020

出　　处：《中国机械工程》2017年第3期300-304,333,共6页China Mechanical Engineering

摘　　要：为准确预测含气油液在空气分离压下有效体积弹性模量的值,基于油液体积弹性模量定义和质量守恒定律,依据含气油液中气相成分随压力的变化过程,推导出含气油液有效体积弹性模量理论模型。数值计算结果表明:含气油液有效体积弹性模量理论模型B-p曲线与现有理论模型及实验数据拟合曲线基本吻合,验证了理论模型的正确性,特别是在低于大气压的极低压区,有效体积弹性模量预测值更加接近实际情况。分析了初始含气量、压力、升压时间对有效体积弹性模量的影响,结果表明:在低于空气分离压范围内,初始含气量增大,有效体积弹性模量减小;在一定范围内,升压时间增大,有效体积弹性模量小幅度增大。In order to predict the effective bulk modulus of air-liquid mixtures of hydraulic oil below the saturation pressure accurately,based on the definition of the bulk modulus and law of mass conservation,according to the air release and cavitation processes,a theoretical model for effective bulk modulus of air-liquid mixtures of hydraulic oil below the saturation pressure was proposed.The numerical calculation results show that the B-pcurve of the theoretical model for effective bulk modulus of air-liquid mixtures of hydraulic oil shows good agreement with the B-p curves of published literature＇s theoretical model and fitted experimental data,verifing the accuracy of the theoretical model,especially the extreme low pressure region below the atmospheric pressure.The effective bulk modulus of air-liquid mixtures of hydraulic oil is more consistent to practical conditions.Furthermore,the effects of initial air content,pressure and pressure rising time on effective bulk modulus were analyzed.The results show that below the saturation pressure area,the effective bulk modulus deceases with the increasing of initial air content,and the effective bulk modulus increases in a narrow range with the increasing of the pressure rising time.

关 键 词：液压油液 有效体积弹性模量 初始含气量 空气分离压 升压时间 

分 类 号：TH137[机械工程—机械制造及自动化]