摘要: |
以某液氢/氧火箭发动机试验台建立为背景,介绍一种高精度低温液体推进剂(液氢/氧)稳态体积流量测量及液位监测系统。该系统由推进剂贮箱、分节电容液面计、二次仪表、采集设备等构成。改进现有系统,使其除了具有获取发动机工作过程中推进剂稳态体积流量的功能外,还能够在推进剂加注时实时监测贮箱内的液位,为推进剂加注操作过程提供依据。重点阐述了大容积推进剂贮箱的标定方法及标定过程中需要注意的问题。经分析及试验验证,该系统实时液位监测精度可达到3%,对液氢/氧稳态体积流量测量的精度分别可达0.539%和0.457%。 |
关键词: 稳态体积流量;液位监测;贮箱标定;测量不确定度 |
基金项目: |
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A Measurement System of Cryogenic Liquid Propellant Flowrate and Liquid Level Monitoring |
Ding Boshen, Yang Jinlong, Li Yanyan
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Beijing Institute of Aerospace Testing Technology, Beijing 100074
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Abstract: |
Based on the establishment of a liquid LHx/LOx rocket engine test bed, the paper introduces a kind of high precision cryogenic liquid propellant (liqiud LHx/LOx) steady state volume flowrate measurement and liquid level monitoring system. This system includes a propellant tank, a sectionalized liquid level gauge, secondary instrument, and acquisition device etc. On the basis of the existing system, the system can not only obtain the steady volume flow of propellant in the process of engine operation, but also monitor the liquid level in the tank in real time when the propellant is filled, which provides the basis for the propellant filling operation process. This paper focuses on the calibration method of large volume propellant tank and the problems needing attention in the calibration process. Through analysis and verification, the accuracy of real-time liquid level monitoring can reach 3%, and the accuracy of liquid hydrogen / oxygen steady-state volume flow measurement can reach 0.539% and 0.457%. |
Key words: steady state volume flowrate measurement;liquid level monitoring;tank calibration;uncertainty in measurement |