|Table of Contents|

Analysis on the causes of pressure spike superimposed on water hammer and its influencing factors(PDF)

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

Issue:
2021年04期
Page:
59-63
Research Field:
研究与设计
Publishing date:

Info

Title:
Analysis on the causes of pressure spike superimposed on water hammer and its influencing factors
Author(s):
ZHOU Chenchu; ZHANG Chenxi; CHEN Hongyu; REN Xiaowen
(Science and Technology on Liquid Rocket Engine Laboratory,Xian Aerospace Propulsion Institute,Xian 710100,China)
Keywords:
liquid rocket engine water hammer pressure spike simulation
PACS:
V430
DOI:
-
Abstract:
During the shutdown of liquid rocket engine and its test bed,the pressure spike superimposed on the water hammer is one of the common faults that cause product damage.In order to analyze the reason of this pressure spike,an engine simulation model is established by using one-dimension finite element method,and a refined model of the main valve is established by considering the influence of the narrow flow channel in front of valve core.The correctness of the model is verified by the experimental data.On this basis,the further study on this pressure spike is carried out.The results show that the pressure spike is caused by the narrow flow channel in front of valve core due to the inherent structure of the valve.Because the narrow flow channel is generally shorter,the duration of the local water hammer is so short that it appears as a spike.By changing the length of the narrow flow channel,the water hammer curve is stepped and its amplitude is inversely correlated with the pipe diameter,and its duration is positively correlated with the length of the corresponding pipeline.

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