N_2O自增压贮箱的动态供应特性

Dynamic supply characteristics of N_2O self-pressurization tank

建立了氧化亚氮(N_2O)贮箱自增压模型并完成了模型校验,获得的贮箱压力计算值与实验结果吻合良好。针对自增压贮箱供应液态介质时的动态工作特性开展了仿真计算,结果表明:在相同的质量流量下,供应液态推进剂比供应气态推进剂更有利于维持箱压和流量稳定;受蒸发吸热作用的影响,自增压贮箱在供应过程中压力总是呈下降趋势。给贮箱加热有利于减缓其压力的下降速度,但存在压力响应滞后、换热面积减小等问题,不易获得稳定的动态供应压力。

A mathematical model of N2O self-pressurization tank was built to study the dynamic supply process,and the calculated tank pressure was in good agreement with the experimental results. For the dynamic operating characteristics of self-pressurization tank supplying the liquid medium,the simulation was carried out. The results show that the supply of the liquid propellant is more favorable than that of the gaseous propellant for maintaining the tank pressure and flow rate steadily under the same mass flow rate. Due to the influence of the evaporation endothermic reaction,the tank pressure usually decreases during the supply process. Heating the tank is beneficial to slow down the rate of pressure drop,but there are problems such as the delayed pressure response and the decreased heat exchange area. In addition,it is difficult to obtain a steady dynamic supply pressure.