火箭推进

建立了氧化亚氮(N2O)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.

引言
1 贮箱自增压模型
2 贮箱动态供应过程仿真计算
3 结论

图1 N2O自增压贮箱模型示意图<br/>Fig.1 Schematic of N2O self-pressurization tank model

图1 N2O自增压贮箱模型示意图
Fig.1 Schematic of N2O self-pressurization tank model

图2 仿真计算与实验值对比<br/>Fig.2 Comparison between experimental data and simulated results

图2 仿真计算与实验值对比
Fig.2 Comparison between experimental data and simulated results

图3 贮箱壁厚和径高比对其压力变化的影响<br/>Fig.3 Influence of wall thickness and diameter-to-height ratio on pressure for the tank

图3 贮箱壁厚和径高比对其压力变化的影响
Fig.3 Influence of wall thickness and diameter-to-height ratio on pressure for the tank

图4 推进剂相态对贮箱压力和供应流量的影响<br/>Fig.4 Influence of propellant phase state on pressure and supply flow rate of tank

图4 推进剂相态对贮箱压力和供应流量的影响
Fig.4 Influence of propellant phase state on pressure and supply flow rate of tank

图5 不同供应相态对应的推进剂温度变化规律<br/>Fig.5 Variation of propellant temperature corresponding to supply phase state

图5 不同供应相态对应的推进剂温度变化规律
Fig.5 Variation of propellant temperature corresponding to supply phase state

图6 加热对贮箱压力稳定性的影响<br/>Fig.6 Influence of heating on stability of tank pressure

图6 加热对贮箱压力稳定性的影响
Fig.6 Influence of heating on stability of tank pressure

图7 贮箱不同位置的换热量与温度变化<br/>Fig.7 Variation of heat exchange quantity and temperature at different positions of tank

图7 贮箱不同位置的换热量与温度变化
Fig.7 Variation of heat exchange quantity and temperature at different positions of tank

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备注

引言

1 贮箱自增压模型

2 贮箱动态供应过程仿真计算

3 结论

期刊信息