|Table of Contents|

Simulation research on ramjet buzz control based on flow field detecting technology(PDF)

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

Issue:
2017年06期
Page:
61-69
Research Field:
研究与设计
Publishing date:

Info

Title:
Simulation research on ramjet buzz control based on flow field detecting technology
Author(s):
LIANG Junlong1;  WANG Yufeng2;  ZHANG Guitian1
1. State Key Laboratory of Combustion, Thermal Structure and Inner Flow Field, School of Astronautics, Northwestern Polytechnical University, Xi'an 710072,China; 2. Xi'an Aerospace Propulsion Institute, Xi'an 710100,China
Keywords:
ramjet;  shock wave detection;  buzz control;  simulation
PACS:
V235.213-34
DOI:
-
Abstract:
In order to make the ramjet performance optimization and always work in a security state, the ramjet's buzz margin should be keep in minimum and within the buzz boundary. A flow field detecting device that can distinguish the supersonic or subsonic flow field status is installed in the buzz boundary to control shock wave location at the intake terminal. Aiming at the one-dimensional variable cross-section flow control equations, the installation position of the flow field detecting device and the fuel reduction law of the control system after the shock wave goes through flow field detecting device are studied in this paper. The simulation result indicates that the method to use the test data to correct theoretical simulation data can accurately catch the shock wave at intake terminal, and according to the critical buzz margin designed for a certain type ramjet, can determine the installation location of the shock exploring device. The pressure along intake changes with the variation of engine's fuel flow, pressure wave propagation time relative to the fuel regulating time can be ignored. As the existence of the pressure hysteresis phenomenon is obvious before and after the intake shock motion, when the shock goes through the buzz boundary, the pressure at intake exit will rise further, the engine buzz risk increases, and the acceleration electromagnetic valve should be adopted to quickly reduce fuel flow, so as to make the shock wave go back to a safe area.

References:

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Last Update: 1900-01-01