Flame dynamics under various backpressures in a model scramjet with and without a cavity flameholder
- Authors
- Kato, N.; Im, S.-K.
- Issue Date
- 2021
- Publisher
- Elsevier Ltd
- Keywords
- Cavity flameholder; Scramjet engine; Supersonic combustion
- Citation
- Proceedings of the Combustion Institute, v.38, no.3, pp.3861 - 3868
- Indexed
- SCIE
SCOPUS
- Journal Title
- Proceedings of the Combustion Institute
- Volume
- 38
- Number
- 3
- Start Page
- 3861
- End Page
- 3868
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/129547
- DOI
- 10.1016/j.proci.2020.07.110
- ISSN
- 1540-7489
- Abstract
- Flame dynamics under various backpressure conditions were experimentally investigated using direct flame visualization, high-speed CH∗chemiluminescence imaging, and wall pressure measurements. The stagnation pressure and temperature used in the present study were 100 kPa and 2500 K, respectively, with a freestream Mach number of 4.5. Rectangular scramjet models with and without a cavity were used to explore the effects of the cavity on flame dynamics when operating in scramjet mode, ramjet mode, and unstart. The flow rate of the ethylene jet was varied to impose backpressures corresponding to each operation mode. For both models, reverse flame propagation was observed for ramjet mode and unstart. For ramjet mode, flame fluctuation occurred within the isolator due to the coupling of fluid dynamics and combustion. The presence of a cavity enhanced combustion and reduced flame fluctuation in both scram and ramjet mode. The cavity promoted unstart because of the greater heat release from combustion. Further research using spatially resolved diagnostic techniques is needed to identify the flame locations for ramjet mode and unstart. © 2020 The Combustion Institute.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.