• 论文 •

模型燃烧室内不稳定燃烧发展过程的数值分析

1. 1. 装备学院 航天装备系, 北京 101416;
2. 西安航天动力研究所, 西安 710100
• 收稿日期:2015-07-08 出版日期:2016-06-20 发布日期:2016-07-06
• 通讯作者: 聂万胜,Tel.:010-66364204 E-mail:nws1969@126.com E-mail:nws1969@126.com
• 作者简介:冯伟 男,博士研究生。主要研究方向:液体火箭发动机燃烧不稳定性。Tel.:010-66364480 E-mail:fengwei_85@163.com;聂万胜 男,博士,教授,博士生导师。主要研究方向:航空宇航推进与先进流动控制。Tel.:010-66364204 E-mail:nws1969@126.com
• 基金资助:
国家自然科学基金(91441123);国家"973"计划(613193)

Numerical analysis of unstable combustion developing process in model combustor

FENG Wei1, NIE Wansheng1, LI Bin2, ZHENG Gang1

1. 1. Department of Space Equipment, Equipment Academy, Beijing 101416, China;
2. Xi'an Aerospace Propulsion Institute, Xi'an 710100, China
• Received:2015-07-08 Online:2016-06-20 Published:2016-07-06

Abstract: Gas-liquid two-phase unsteady combustion process was simulated with the Euler-Lagrange method to analyze the combustion instability, which was observed in hypergolic propellant combustor. The pressure oscillations amplitude and spectral characteristics agreed with the experimental results. And the variation rule of pressure and heat release in different combustion stages was analyzed. The results indicate that, while the pressure oscillation amplitudes exceed 10% of the average pressure, the pressure oscillation frequency is 9 200 Hz, and the transverse pressure distribution is in accordance with the first-order tangential vibration mode. The generation and developing process of the first-order tangential self-excited high frequency unstable combustion have been reproduced in simulation. At the early stage of the change from stable to unstable combustion, the pressure oscillation obtains energy from part of the combustion heat release fluctuations and the pressure oscillation amplitude increases slowly. With the combustion, the phase and spectral characteristics between the combustion heat release and pressure oscillation tend to be the same, and the pressure oscillation increases sharply. When they are fully coupled, the pressure oscillation amplitude in combustion chamber exceeds 200% of average chamber pressure and reaches the limits of saturation.