摘要
以低温贮箱压力控制为目标,建立了热力学排气系统(TVS)和贮箱内流体流动及气液相变过程的数学模型。以18.09m^3低温贮箱在地面工况充注率75%、漏热量0.76W/m^2为例,计算了不同贮存工质(液氢、液氮、液氧)下贮箱自增压过程及开启TVS后对贮箱压力控制的效果。结果表明,相同漏热率下液氢贮箱的气枕升压速率远大于相同充注率下的液氮和液氧贮箱升压速率;TVS运行后三种工质贮箱压力均可有效地控制在165.5~172.4kPa范围内。对比了不同工质热力学排气系统的运行周期、运行时间及排气量等关键参数,同时还分析了贮箱内液体的温度变化规律。
To study the pressure control of cryogenic propellant container, an analytical lumped parameter model was estab- lished to predict the behavior of pressure variation inside a cryogen tank with TVS. Simulations were conducted for the tank with volume of 18.09m^3 initially filled with 75% cryogens and with a heat leak load of 0.76 W/m^2. Calculation results of different storage mediums of liquid hydrogen （ LH2 ）, liquid nitrogen （ LN2 ） and liquid oxygen （ LO2 ） were compared. The results show that the ullage pressure of LH2 tank rises much faster than that of LN2 and LO2 tanks with the same heat flux and the TVS is high- ly effective and feasible in controlling the tank pressure within 165.5 - 172.4kPa for the three kinds of fluids. The operation cycle, total running time and vent mass loss etc. , key parameters of TVS with different working fluids are compared and analyzed. The temperature profiles of the fluids are also studied.
出处
《低温与超导》
北大核心
2017年第12期1-6,共6页
Cryogenics and Superconductivity
基金
上海航天核攀项目(ZY2016-016)
关键词
低温贮箱
热力学排气
压力控制
运行特性
Cryogen tank, Thermodynamic vent, Pressure control, Operation characteristics
