航空柱塞泵全工况效率分析及热力学建模

Efficiency analysis and thermal-hydraulic modeling of aerial piston pump at whole work condition

针对航空柱塞泵全工况热力学建模问题,在泵功率损失分析和传热分析的基础上建立了柱塞泵的热力学模型.考虑负载压力、输入转速、斜盘倾角和油液粘度影响,得到了泵功率损失模型.对泵传热进行了详细分析,采用控制体温度变化方程建立了描述泵各部分温度变化的热力学模型.对包含柱塞泵的简单液压系统采用Dymola进行了仿真计算,得到了不同输入转速和负载压力下泵效率及功率损失,分析比较了不同输入转速和供油流量下泵各部分温升情况.结果表明:泵效率及功率损失受输入转速和负载压力影响,在不同输入转速和供油流量下泵表现出不同的温升特性.

Thermal-hydraulic model of aerial piston pump was established based on analysis of power loss and heat transfer.Power loss model of pump was obtained,considering the influence of load pressure,input rotational speed,swash plate angel and oil viscosity.With the analysis of heat transfer in pump,the thermal-hydraulic model of pump was established to display the temperature change in all parts of the pump,which takes advantage of formula of temperature change in control volume.A hydraulic system,consisting of piston pump was simulated with Dymola to show efficiency and power loss of pump at different input rotational speed and load pressure.Temperature rising in different parts of pump at different input rotational speed and supply flow was analyzed.The result shows that the input rotational speed and load pressure impact the efficiency and power loss of pump,and temperature rising in pump presents differently in characteristics at different input rotational speed and supply flow.