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本文介绍以落压方式工作的推进剂供应系统的时间响应分析。供应系统是用在星际宇宙飞船上的泵压输送推进系统的组成部分,因此,供应系统必须能提供足以防止推进剂泵产生汽蚀的压力。系统包括贮箱、液体推进剂、增压气体-推进剂蒸汽混合物以及分隔液相-汽相的膜层,用质量和能量守恒原理进行分析。作为一个初始值问题对热力学状态变量的共轭非线性常微分方程组进行积分,求得总压、推进剂蒸汽压、推进剂液体温度、膜层温度、推进剂蒸汽/增压气体温度、推进剂蒸汽的质量以及推进剂液体的质量随时间的变化,从而推算出泵的有效净正抽吸压头(NPSH),以确定用落压方式工作的泵压输送系统原理的可行性。
This article describes the time response analysis of a propellant supply system that operates in a pressure-relief manner. The supply system is part of a pumped propulsion system used on an interstellar spacecraft and therefore the supply system must be able to provide enough pressure to prevent cavitation in the propellant pump. The system consists of tanks, liquid propellants, pressurized gas-propellant-vapor mixtures, and liquid-vapor phase-separated films that are analyzed using the mass and energy conservation principles. As an initial value problem, the system of integral equations of thermodynamic state variables is integrated to obtain the total pressure, the vapor pressure of the propellant, the liquid temperature of the propellant, the temperature of the membrane, the temperature of the propellant gas / The quality of the propellant and the quality of the propellant liquid as a function of time, the net positive suction head (NPSH) of the pump is calculated to determine the feasibility of the pump delivery system operating with the pressure drop method.