|Table of Contents|

Self-excited oscillation characteristics of check valve of LOX/kerosene engine(PDF)

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

Issue:
2021年05期
Page:
35-41
Research Field:
研究与设计
Publishing date:

Info

Title:
Self-excited oscillation characteristics of check valve of LOX/kerosene engine
Author(s):
CHEN Yidan; CHEN Hongyu
(Science and Technology on Liquid Rocket Engine Laboratory,Xian Aerospace Propulsion Institute,Xian 710100,China)
Keywords:
liquid propellant rocket engine check valve self-oscillation numerical simulation experiment validation Modelica
PACS:
V433
DOI:
-
Abstract:
The transient model of check valve flow-path system used in a staged combustion cycle LOX/kerosene engine system was established. The partial differential equations governing the unsteady flow of propellant pipelines were solved by the Fourier spectral method. A modularization model of a characteristic research system for check valve flow-path system was established based on Modelica language. The continuous self-excited oscillation of the open process of the liquid oxygen check valve core was realized by adding step disturbance to the pressure in front of the valve. Then aiming at the instabilities observed during testing operation,the influences of several structural and control parameter on the stability of check valve were clarified by a series of simulation. The results show that during the self-excited oscillation of the liquid oxygen check valve,the pressure and flow rate in front of the valve oscillate continuously,and the oscillation frequency is close to about 725 Hz. The process of self-excited oscillation of check valve may be dominated by transient hydrodynamic and spring elastic coupling. Those measures which can improve the dynamic stability include:increasing the mass of valve spool,reducing the size of orifice,increasing the stiffness of diaphragm. The comparison with the experimental results confirms the effectiveness and feasibility of some measures.

References:

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