|Table of Contents|

Influence of gas drive pre-pressurized turbo-pump on frequency characteristics of liquid oxygen system in rocket engine(PDF)

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

Issue:
2021年01期
Page:
76-82
Research Field:
研究与设计
Publishing date:

Info

Title:
Influence of gas drive pre-pressurized turbo-pump on frequency characteristics of liquid oxygen system in rocket engine
Author(s):
HE Chuang; XING Lixiang; XU Haohai
(Xi'an Aerospace Propulsion Institute, Xi'an 710100, China)
Keywords:
LOX/kerosene staged combustion cycle rocket engine;  pre-pressurized turbo-pump;  frequency characteristics;  POGO;  transmission matrix
PACS:
V434.21
DOI:
-
Abstract:
The frequency characteristics of liquid oxygen system in the LOX/kerosene staged combustion cycle engine are of great significance to the vibration of rocket POGO and the engine dynamics. Based on the liquid oxygen system in a LOX/kerosene staged combustion cycle engine,a linearized small deviation frequency domain model was established by emphatically considering the influence of gas turbine and pump dynamic characteristics.The influence of the gas turbine pressure ratio, the dynamic gain of the oxygen pre-pressurized pump and the gas mixing section on the system frequency characteristics were calculated by using the complex coefficient state space matrix. The results show that under the low-pressure ratio condition of the preloaded turbine, the system response amplitude becomes larger, which has less influence on the system frequency.The higher the dynamic gain of the pressurized pump, the lower the system frequency and the larger the amplitude.The longer the gas mixing section, the lower the system frequency and the smaller the amplitude.

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Last Update: 2021-02-20