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Open AccessFeature PaperArticle

Forced Combustion Characteristics Related to Different Injection Locations in Unheated Supersonic Flow

1
Engine Test and Evaluation Team, Korea Aerospace Research Institute, Daejeon 34133, Korea
2
Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, Korea
*
Author to whom correspondence should be addressed.
Energies 2019, 12(9), 1746; https://doi.org/10.3390/en12091746
Received: 15 April 2019 / Revised: 29 April 2019 / Accepted: 29 April 2019 / Published: 8 May 2019
(This article belongs to the Special Issue Scramjet and Ramjet Combustion)
This work focuses on forced combustion with regards to the relationship between vent mixer models and several injection locations in unheated supersonic flow. A plasma jet torch was used to ignite the hydrogen-air mixture in a laboratory-scaled combustor duct. The flow field of the combustion was visualized with pressure and gas-sampling measurements. The vent mixers indicate good dispersion characteristics of the mixture for both parallel and normal 1 injections. However, forced combustion is dominantly governed by the injection rate toward the plasma jet (hot source) because the combustible region is restricted under the cold main flow. For this reason, the parallel injection, which provides the hydrogen-air mixture directly toward the plasma jet, shows good combustion performance. The normal 1 injection interacted with the vent mixers and shows slightly good combustion performance. Lastly, the normal 2 injection is little affected by the vent mixers and has poor combustion performance. View Full-Text
Keywords: supersonic combustion; vent mixer; mixing; combustion performance supersonic combustion; vent mixer; mixing; combustion performance
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MDPI and ACS Style

Kim, C.-H.; Jeung, I.-S. Forced Combustion Characteristics Related to Different Injection Locations in Unheated Supersonic Flow. Energies 2019, 12, 1746.

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