【作者】 赵耀中； 刘玉涛；

【Author】 Zhao Yaozhong,Liu Yutao (Beijing Institute of Aerospace Testing Technology,Beijing 100074,China)

【机构】 北京航天试验技术研究所；

【摘要】 通过分析液氧贮槽在加注和增压排液过程中两种介质所处的状态,给出了进入罐体时氮气的绝热节流模型、界面附近液氧的一维半无限大导热模型及其初始条件和边界条件,并求解得出增压10min后液面下3cm处温度达到初始温度(90K)的结论。对于界面处的复杂换热机理,假设了点式电容液位计由液氧层进入被液化的氮层这种极端情况,根据分析得出如果传感器真空电容值达50PF,在增压压力处于10～25MPa范围内能得到电容变化量不小于3.6PF。从而认为连续式和点式电容液位计相结合的液位测量方案适用于本系统。更多还原

【Abstract】 An adiabatic expanding model and a semi - infinity thermal conduction model were applied to analyze the state of Nitrogen and liquid Oxygen（LO₂ ） in this vessel.It indicates that,the temperature of LO₂ deeper than 3cm below the liquid level rises little in 10min when the extruding Nitrogen reaches it’s pressure required.The capacitance liquidometer was chosen for this system based on some calculation.It appears that,if the capacitance value of the sensor in vacuum is 50PF,the rise of it will larger than 3.6PF when it changes from liquid oxygen to liquid nitrogen at the pressure of 10～25MPa.Additionally,the feasibility of this method was briefly narrated.更多还原