Research and Development on Ramjet Combustion Instabilities

  • GUAN Yiheng ,
  • BECKER Sid ,
  • ZHAO Dan
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  • Department of Mechanical Engineering, Faculty of Engineering, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand

Online published: 2025-05-06

Supported by

This work is financially supported by the University of Canterbury, New Zealand with grant No. 452DISDZ. This financial support is gratefully acknowledged. The authors would like to thank Dr. Bernhard Semlitsch from TU Wien (Austria) for helpful discussion.

Copyright

The Author(s) 2025

Abstract

Recent research and development on ramjet and supersonic combustion ramjet (scramjet) engines is concerned with producing greater thrust, higher speed, or lower emission. This is most likely driven by the fact that supersonic/hypersonic propulsion systems have a broad range of applications in military sectors. The performances of such supersonic/hypersonic propulsion systems depend on a series of physical and thermodynamic parameters, such as the fuel types, flight conditions, geometries and sizes of the engines, engine inlet pressure/velocity. As a propulsion system, a stable and efficient combustion is desirable. However, self-excited large-amplitude combustion oscillations (also known as combustion instabilities) have been observed in liquid- and solid-propellant ramjet and scramjet engines, which may be due to acoustic resonance between inlet and nozzle, vortex kinematics (large coherent structures), and acoustic-convective wave coupling mechanisms due to combustion. Such intensified pressure oscillations are undesirable, since they can lead to violent structural vibration, and overheating. How to enhance and predict the engines’ stability behaviors is another challenge for engine manufacturers. The present work surveys the research and development in ramjet combustion and combustion instabilities in ramjet engines. Typical active and passive controls of ramjet combustion instabilities are then reviewed. To support this review, a case study of combustion instability in solid-fueled ramjet is provided. The popular mode decomposition algorithms such as DMD (dynamic mode decomposition) and POD (proper orthogonal decomposition) are discussed and applied to shed lights on the ramjet combustion instability in the present case study.

Cite this article

GUAN Yiheng , BECKER Sid , ZHAO Dan . Research and Development on Ramjet Combustion Instabilities[J]. Journal of Thermal Science, 2025 , 34(3) : 689 -706 . DOI: 10.1007/s11630-025-2103-8

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