A comprehensive study of combustion oscillations in a hydrocarbon-fueled scramjet engine

Jian Li, Fuhua Ma, Vigor Yang, Kuo Cheng Lin, Thomas A. Jackson

研究成果: Conference contribution

6 引文 斯高帕斯(Scopus)

摘要

The occurrence of combustion oscillations has recently raised a serious concern in the development of scramjet engines. This phenomenon results from the mutual coupling between the unsteady heat release and local flow fluctuations in the flame zone, and has been commonly observed in other types of airbreathing systems such as ramjet and gas-turbine engines. In a scramjet engine, acoustic waves may arise in an unsteady combustion process and propagate upstream through various subsonic flow regions (such as boundary layers, recirculation zones in flame-holding areas, and regions behind precombustion shock waves). These waves then modify the local flowfield and create vortical and entropy disturbances convected downstream into the flame zone. The ensuing pressure and velocity fluctuations perturb the heat-release process and generate acoustic waves traveling upstream. A feedback loop is thus established causing large-amplitude flow oscillations in the engine. Recent experiments have demonstrated the existence of flow oscillations in a hydrocarbon-fueled scramjet engine facility with frequencies of 100-160 Hz for liquid JP-7 fuel and 300-360 Hz for gaseous ethylene fuel. The present work attempts to establish an integrated theoretical/numerical framework to investigate the combustion oscillations in a scramjet combustor equipped with aerodynamic ramp fuel injectors and a cavity flameholder. Various underlying mechanisms responsible for driving instabilities in a combustor are explored systematically.

原文English
主出版物標題Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
發行者American Institute of Aeronautics and Astronautics Inc.
頁面10170-10181
頁數12
ISBN(列印)1563478900, 9781563478901
DOIs
出版狀態Published - 2007
事件45th AIAA Aerospace Sciences Meeting 2007 - Reno, NV, United States
持續時間: 2007 一月 82007 一月 11

出版系列

名字Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
15

Other

Other45th AIAA Aerospace Sciences Meeting 2007
國家United States
城市Reno, NV
期間07-01-0807-01-11

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

指紋 深入研究「A comprehensive study of combustion oscillations in a hydrocarbon-fueled scramjet engine」主題。共同形成了獨特的指紋。

引用此