贮箱增压控制与停放过程影响因素分析

Influencing Factors Analysis of Pressure Control of Tank and after Pressurization Waiting for Launch

以液体火箭地面增压系统增压过程及增压完成后停放贮箱压力变化规律为研究对象,基于AMESim软件建立地面增压系统仿真模型,利用地面增压试验数据验证了模型的正确性。据此开展分析,讨论了地面增压孔板孔径、增压系统关闭响应时间、地面管路容积、压力、推进剂温度变化、贮箱气枕温度变化对贮箱压力的影响。结果表明:对于液体运载火箭,如能有效控制增压电磁阀关闭响应时间、合理布局地面管路、充分考虑推进剂和贮箱气枕温度变化的影响,保持合理裕度,可以适应射前增压时间提前的要求。

The process of liquid rocket’s tank pressurization before launch and the change rule of tank pressure after pressurization were numerically simulated.A simulation model of tank pressurization is developed based on AMESim,which is verified by the experiment data.Accorded to it,the effects of the diameter of pressurized orifice,pressurization system's response time,volume and pressure of pipeline,temperature variation of propellant and ullage gas on tank pressure are analyzed.The results indicate that,liquid rocket can be adapted to advancing pressurization time before launch,if the response time of solenoid valve is effectively controlled,the pressurization pipeline is suitably arranged,the effects of temperature variation of propellant and ullage gas are adequately considered and keep safety margin.