高室压发动机系统适用性研究

应用Gibbs自由能法和喷管冻结流动模型,时双组元液体发动机推力室进行了热力气动计算;以系统总质量为目标函数,建立了姿轨控推进系统仿真模型,分析了推力室压强对系统性能参数的影响. 结果 表明：在空间尺寸受限条件下,提高推力室压强,可有效缩小推力室尺寸,增加喷管面积比,提高发动杌比冲和系统总体性能.但当推力室压强较高时,这种效果减缓,同时推进系统总质量增幅较大,设计时应综合权衡.

Applicability Study on Liquid Rocket Engine System under High Chamber Pressure

Using Gibbs free energy method and nozzle frozen flow model, the thermodynamic calculation in bipropellant liquid rocket engine thrust chamber calculation was processed;taking the system gross mass as the objective function, the simulation model of the attitude/orbit control propulsion system was established, and the influence to the system performance parameters caused by chamber pressure was analyzed. The calculation results show that, by enhancing thrust chamber pressure, thrust chamber size could be decreased effectively, and nozzle area ratio could be increased, also the engine specific impulse and system total performance could be advanced when space dimension is limited. But the effect slows down and system gross mass increases obviously when the pressure is higher, so it should be considered generally when designing.