通用油箱热模型的建模与仿真

Modeling and simulation of general fuel tank thermal model

全面考虑各种传热情况,建立了油箱壁面、油箱内气体和燃油的热平衡微分方程组,进而在Flowmaster平台上用C#语言二次开发了通用的油箱仿真模型.对某燃油系统进行了典型飞行剖面内的动态仿真,根据燃油质量、回流燃油质量流量和燃油温度的变化曲线定量分析用燃油作为热沉的冷却能力,确定适当的燃油混合循环质量流量以及燃油散热器的冷却量.结果表明:对于所研究的燃油系统,燃油能够冷却的最大热载荷约为50kW;当热载荷为70kW时,供油箱与前后输油箱的循环质量流量分别为0.3kg/s和0.1kg/s,燃油散热器冷却量为12kW.

Heat balance differential equations were built for fuel tank wall,gas inside the fuel tank and fuel by considering comprehensive heat transfer processes.Then general simulation model of fuel tank was further developed on the Flowmaster platform with C#language.Dynamic simulations of a fuel system were subsequently performed over a typical flight profile to get dynamic curves of fuel mass,recirculation fuel mass flow rate and fuel temperature,so that quantitative analyses on the cooling ability of fuel could be conducted,and then appropriate circulation mass flow rates,and cooling capacity of the fuel radiator were obtained.Results show that the maximum heat load which can be carried away by the fuel is about 50kW of this fuel system.For a higher heat load of 70kW,circulation mass flow rates between the supply and transport tanks（front and back）are 0.3kg/s and 0.1kg/s,and the cooling capacity of the fuel radiator is 12kW.