• Title/Summary/Keyword: 공동형 보염기

Search Result 6, Processing Time 0.017 seconds

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
    • /
    • 2014.03a
    • /
    • pp.603-609
    • /
    • 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.

  • PDF

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
    • /
    • v.24 no.5
    • /
    • pp.13-20
    • /
    • 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.

A Unified 3D Numerical Analysis of a Model Scramjet Engine with a Cavity Flame-Holder and Two Intake Side Walls (공동형 보염기를 갖는 모델 스크램제트 엔진의 흡입구 측면효과를 고려한 3차원 통합 유동해석)

  • Yeom, Hyo-Won;Kim, Sung-Jin;Sung, Hong-Gye;Kang, Sang-Hoon;Yang, Soo-Suk
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2009.11a
    • /
    • pp.590-593
    • /
    • 2009
  • To identify the detailed 3D flow characteristics of a model scramjet engine, a unified 3D numerical analysis was performed. The numerical domain of concern includes the entire flow path of the model scramjet engine extending from the intake to the nozzle exhaust. Turbulent models($k-{\omega}$ SST and low Reynolds number k-e with Sarkar model) were applied with comparison of experiment result. Intake side wall's effect on flow characteristics was analyzed in view points of flow quality at inlet duct and near the flame holder as well. The code is paralleled with multi-block feature using MPI(Massage Passing Interface) library to speed up the 3D calculation.

  • PDF

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
    • /
    • v.17 no.3
    • /
    • pp.9-14
    • /
    • 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.

Scramjet Engine Combustor Test with Vitiation Heater Type Supersonic Wind Tunnel (Vitiation heater 형 초음속풍동을 이용한 스크램제트 엔진 연소기의 연소시험)

  • Kang, Sang-Hun;Lee, Yang-Ji;Yang, Soo-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2009.11a
    • /
    • pp.586-589
    • /
    • 2009
  • Scramjet engine combustor was tested with "RAMSYS" blow down wind tunnel in Kakuda Space Center, JAXA. As a result, installation of a cavity showed larger combustion pressure than the case without a cavity. Zigzag cavity applied for the first time in this experiment, showed the largest combustion pressure and is expected to contribute to the stable and economic operation of scramjet.

  • PDF

Deterioration Diagnosis and Source Area of Rock Properties at the West Stone Pagoda, Gameunsaji Temple Site, Korea (감은사지 서탑의 풍화훼손도 진단 및 석재의 산지추정)

  • Lee Chan Hee;Lee Myeong Seong;Suh Mancheol;Choi Seok-Won;Kim Man Gap
    • Economic and Environmental Geology
    • /
    • v.37 no.5
    • /
    • pp.569-583
    • /
    • 2004
  • The rock properties of the West pagoda in the Gameunsaji temple site are composed mainly of dark grey porphyritic granodiorite with medium grained equigranular texture and developed with small numerous dioritic xenoliths. These xenoliths occurred with small holes due to different weathering processes. As a weathering results, the rock properties of this pagoda occur wholly softened to physical hardness because of a complex result of petrological, meteorological and biological causes. Southeastern part of the pagoda deteriorated seriously that the surface of rock blocks showed partially exfoliations, fractures, open cavities in course of granular decomposition of minerals, sea water spray and crystallization of salt from the eastern coast. The Joint between blocks has small or large fracture cross each other, contaminated and corrupted for inserting with concrete, cement mortar, rock fragments and iron plates, and partially accelerated coloration and fractures. There are serious contamination materials of algae, fungus, lichen and bryophytes on the margin and the surface on the roof stone of the pagoda, so it'll require conservation treatment biochemically for releasing vegetation inhabiting on the surface and the discontinuous plane of the blocks because of adding the weathering activity of stones and growing weeds naturally by soil processing on the fissure zone. Consisting rock for the conservation and restoration of the pagoda would be careful choice of new rock properties and epoxy to reinforce for the deterioration surfaces. For the attenuation of secondary contamination and surface humidity, the possible conservation treatments are needed.