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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationCollection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
Pages10170-10181
Number of pages12
ISBN (Print)1563478900, 9781563478901
DOIs
Publication statusPublished - 2007
Event45th AIAA Aerospace Sciences Meeting 2007 - Reno, NV, United States
Duration: 2007 Jan 82007 Jan 11

Publication series

NameCollection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
Volume15

Other

Other45th AIAA Aerospace Sciences Meeting 2007
CountryUnited States
CityReno, NV
Period07-01-0807-01-11

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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