|Table of Contents|

Study on system stability of deep-throttling staged combustion cycled engine(PDF)

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

Issue:
2020年03期
Page:
41-48
Research Field:
研究与设计
Publishing date:

Info

Title:
Study on system stability of deep-throttling staged combustion cycled engine
Author(s):
CHEN Wen1;  XING Lixiang1;  XU Haohai1;  LIU Zhirang2;  LI Chunhong1
(1.Xi’an Aerospace Propulsion Institute, Xi’an 710100, China; 2.Academy of Aerospace Propulsion Technology, Xi’an 710100, China)
Keywords:
oxygen-riched staged combustion cycled engine;  deep-throttling;  system stability;  sensitive parameter analysis;  numerical simulation
PACS:
V434.2
DOI:
-
Abstract:
During the deep-throttling process of staged combustion cycled engine, the system parameters vary in a large range. Under the low operating condition, the injection pressure drop and the pressure drop of feed system throttling element are relatively low, so the coupling instability between the propellant feed system and the thermal component is easy to occur. For the 10:1 deep-throttling oxygen-enriched staged combustion cycled engine, the coupling stability of the after-pump feed system and the gas system within the full operating range was studied by Nyquist stability analysis method. The results show that the stability margin of the closed-loop system composed of the fuel feed circuit and the gas circuit is low under low operating conditions of the oxygen-enriched staged combustion cycled engine. The system stability margin is able to be enhanced by improving the evaporation and combustion effect of the gas generator to shorten the time lag, increasing the gas residence time, and increasing the pressure drop near the gas generator

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Last Update: 2020-06-25