Hyung Mo Bae, Jihyuk Kim, Juyeong Nam, Injoong Chang, Hee Koo Moon, Hyung Hee Cho

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


The scramjet engine burns fuel under supersonic flow condition in a combustion chamber while minimizing total pressure such that it can operate under both supersonic and hypersonic flows. For combustion under supersonic flow field, a flame holder is essential to overcome short fuel residence time and poor mixing, and a backward facing step is the simplest and best performing method that can be used as a flame holder. Proper interaction between the flame holder and fuel injection can improve engine performance in fluidic conditions. However, it creates significantly more heating condition that imposes challenges in thermal design and thermal management. In the flame holder design, measuring and analyzing the flow mixing and heat transfer characteristics should be preceded. In this study, flow mixing and heat transfer characteristics analysis by flame holder and secondary injection were performed by numerical simulations. In a flow field with Mach 3 mainstream, the test domain in which a 5 mm backward facing step and a hole for fuel injection in the downstream area was selected for experiment. The sonic jet is generated in the circular hole. First, to analyze the effect of the backward facing step on the secondary injection and supersonic crossflow, heat transfer and comparative analyses were performed with and without the backward facing step. And the effect of the ratio between hole position and step height on the heat transfer was analyzed. Two approaches were used to analyze the heat transfer. One was to analyze the point where the transfer phenomenon increased, and the second was to analyze how much the area affected as the heat transfer increased. As the position of the hole on the stepraised, the resulting heat transfer increased, but the area size affected by this high heat transfer decreased and then increased again.

Original languageEnglish
Title of host publicationProceedings of ASME 2022 Heat Transfer Summer Conference, HT 2022
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791885796
Publication statusPublished - 2022
EventASME 2022 Heat Transfer Summer Conference, HT 2022 - Philadelphia, United States
Duration: 2022 Jul 112022 Jul 13

Publication series

NameProceedings of ASME 2022 Heat Transfer Summer Conference, HT 2022


ConferenceASME 2022 Heat Transfer Summer Conference, HT 2022
Country/TerritoryUnited States

Bibliographical note

Funding Information:
This work was supported by the Human Resources Development program (No 20204030200110) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy.

Publisher Copyright:
Copyright © 2022 by ASME.

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Condensed Matter Physics


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