• Title/Summary/Keyword: Cavity Flameholder

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Numerical Study of Flow Characteristics of Scramjet with a Cavity Flameholder (스크램제트 공동 화염 보염기 형상에 따른 유동 특성의 수치적 연구)

  • Jang, Won-Geun;Lee, Hak-Jin;Choe, Seong-Im
    • Proceeding of EDISON Challenge
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    • 2014.03a
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    • pp.603-609
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    • 2014
  • 차세대 제트 추진기관으로 주목받고 있는 스크램제트 엔진의 핵심은 연소기 내부에서의 성공적인 초음속 연소를 필요로 한다. 초음속 연소는 공기-연료 혼합(fuel-air mixing)의 정도에 따라 연소효율이 영향을 받게 된다. 공동형 화염 보염기(cavity flameholder)는 재순환 영역(recirculation zone)을 생성하여 연료 혼합의 효율을 높여 지속적인 초음속 연소가 진행될 수 있는 시간을 제공한다. 본 연구에서는 EDISON 전산유체역학 소프트웨어를 이용하여 공동형 화염 보염기를 지나는 초음속 유동의 재순환 영역과 전압력 변화에 대한 전산 해석을 수행하였다. 초기 형상을 생성하여 유동 해석을 수행한 후, 3개의 형상 변수에 대한 매개 변수 연구를 통하여 공동의 형상과 위치에 따른 재순환영역의 제어가 가능함을 확인하였다.

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Combustion Performance According to the Cavity Flameholder Location in a Supersonic Combustor (초음속 연소기에서 공동형 보염기 위치에 따른 연소 성능)

  • Yang, Inyoung;Lee, Kyung-jae;Lee, Yang-ji;Lee, Sang-hoon
    • Journal of the Korean Society of Propulsion Engineers
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    • v.24 no.5
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    • pp.13-20
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    • 2020
  • The effect of the relative distance between two cavity flame holders on the performance of a supersonic combustor was experimentally investigated. A rectangular cross-sectional combustor model with one cavity flame holder on each of two facing walls was used, with two difference distances between cavities of 135 mm and 220 mm. The fuel equivalence ratio was varied as 0.16 and 0.38. A direct-connected type test facility was used to provide Mach 2 flow condition. The test results revealed that the combustion pressure was higher for the shorter cavity distance case. But fuel equivalence ratio did not have large effect on the combustion pressure. It was concluded that, to get higher combustor pressure, there needs to be further combustor configuration change such as smaller cavity distance or tandem cavity installation.

Combustion Test of a Mach 5 Scramjet Engine Model (마하 5 스크램젯 엔진 모델의 연소 시험)

  • Yang, Inyoung;Lee, Yang-Ji;Kim, Young-Moon;Lee, Kyung-Jae
    • Journal of the Korean Society of Propulsion Engineers
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    • v.17 no.3
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    • pp.9-14
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    • 2013
  • Combustion tests were conducted for a hydrogen-fueled Mach 5 scramjet engine model using a blow-down facility. No fuel and two fuel flow rate cases were tested for two different model configurations. Time history of the wall static pressures inside the model and their time-averaged spatial distribution were used for the analysis of the flow and combustion characteristics. For shorter model, supersonic combustion was occurred for both of the fuel flow rate cases. For longer model, supersonic combustion was occurred for less fuel case, whereas thermal choking and subsonic combustion were occurred for more fuel case. Intake started even for this subsonic combustion case.