|Table of Contents|

Research on formation mechanism of negative pressure phenomenon in propellant pipeline(PDF)

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

Issue:
2015年04期
Page:
37-42
Research Field:
研究与设计
Publishing date:

Info

Title:
Research on formation mechanism of negative pressure phenomenon in propellant pipeline
Author(s):
CAO Wei;  WANG Rui;  CHEN Jian;  WEI Yanxiang;  JIN Guangming;  LIU Feng
Shanghai Institute of Space Propulsion, Shanghai 201112, China
Keywords:
propulsion system;  propellant pipeline;  negative pressure phenomenon;  molecular diffusion
PACS:
V434-34
DOI:
-
Abstract:
During testing process of landing propulsion system in Chang'e-3, the negative pressure phenomenon was detected in the propellant pipeline for orbit control. Fault tree analysis method was used to investigate the formation mechanism of the negative pressure phenomenon. Single level and system level validation tests were conducted based on the analytical results from fault tree analysis method. The formation mechanism of the negative pressure phenomenon was confirmed by experiments and investigation. The phenomenon is caused by helium, which is used in the leak hunting of Chang'e-3 propulsion system, and then stayed in the pipeline for a long time. Helium concentration in the pipeline is far higher than the air in environment, so helium molecular diffusion occurs with pressure drop in the system, and the negative pressure phenomenon is appeared. The negative pressure phenomenon coincides

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