|Table of Contents|

Effect of subcooled degree on performance of thermodynamic vent system in spacecraft tank(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2020年04期
Page:
74-81
Research Field:
研究与设计
Publishing date:

Info

Title:
Effect of subcooled degree on performance of thermodynamic vent system in spacecraft tank
Author(s):
ZHANG Hao1; WANG Shuai1; ZHUAN Rui1; CHEN Qifa1; ZHANG Liang1; WANG Bin1; HUANG Yonghua2
(1.Aerospace System Engineering Shanghai, Shanghai 201109, China; 2.Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China)
Keywords:
cryogenic tank;  thermodynamic vent;  subcooled degree;  pressure control
PACS:
V511.6
DOI:
-
Abstract:
In order to investigate the pressure control behavior of cryogenic propellant tank and operating performance of thermodynamic vent system(TVS), a mathematical model coupling both the fluid flow phase change in the tank and the thermodynamic vent subsystem was established, and the tank self-pressurization process and the tank pressure control effect under the operation of TVS were simulated.In the cryogenic fluid storage platform using liquid nitrogen as the working medium, the tank pressure control experiment was conducted to verify the simulation model.The influence of subcooled degree on the temperature and pressure control of the cryogenic tank was analyzed.It is found that during the same in-orbit storage period, for the saturated LH2-LO2 propellant, the tank pressure can only be controlled with the vent mode of TVS.For the LH2-LO2 propellant in subcooled state, the TVS only need operating in the mixing mode to control the tank pressure.Moreover, the mixing operation duration deceases with the increase of the liquid subcooled degree, and TVS takes 17.6% less operation time(546 s)at 16 K liquid hydrogen than at 20 K liquid hydrogen(663 s).The operation time of TVS at 78 K liquid oxygen(2 760 s)is 83.2% less than that at 90 K liquid oxygen(16 469 s).Zero discharge of cryogenic fluid during in-orbit storage can be achieved by mixing the subcooled liquid and the superheated ullage.

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Last Update: 2020-07-30