|Table of Contents|

Simulation on water hammer during liquid rocket engine shutdown(PDF)

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

Issue:
2021年01期
Page:
70-75
Research Field:
研究与设计
Publishing date:

Info

Title:
Simulation on water hammer during liquid rocket engine shutdown
Author(s):
ZHOU Chenchu;  LI Shuxin;  CHEN Hongyu;  WANG Dan;  REN Xiaowen
(Science and Technology on Liquid Rocket Engine Laboratory, Xi'an Aerospace Propulsion Institute, Xi'an 710100, China)
Keywords:
liquid rocket engine;  water hammer;  one-dimensional finite element;  numerical simulation
PACS:
V430
DOI:
-
Abstract:
Water hammer during shutdown is one of the common phenomena that cause liquid rocket engine or its test bed to fail.To study the characteristics of water hammerduring liquid rocket engine shutdown, simulation models were built based on one-dimensional finite element and the correctness of these models were verified by ground test.On this basis, the influences of common design variables were studied by simulation. The results show that the increment of water hammer is proportional to the flow rate and velocity of propellant.When the pipe is long enough the increment of water hammer is independent of its length, otherwise the shorter the pipe is, the smaller the increment is.The closer the local flow resistance is to the tank, the more favorable it is to reduce water hammer increment and accelerate its convergence.When the valve movement time is less than half of the water hammer cycle, the water hammer increment is equal to complete water hammer value, otherwise the shorter the valve movement time is, the smaller the water hammer will be.The water hammer will be obviously inhibited, while a small amount of gas is injected into the propellant.

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Last Update: 2021-02-20