Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Development of Hybrid/Dual Swirl Jet Combustor for a MGT (Part II: Numerical Study on Isothermal Flow)

마이크로 가스터빈용 하이브리드/이중 선회제트 연소기 개발 (Part II: 비반응 유동에 관한 수치해석)

  • Mun, Sun-Yeo (Department of Fire and Disaster Prevention, Daejeon University) ;
  • Hwang, Cheol-Hong (Department of Fire and Disaster Prevention, Daejeon University) ;
  • Lee, Kee-Man (School of Mechanical and Aerospace Engineering, Sunchon National University)
  • Received : 2013.06.09
  • Accepted : 2013.09.18
  • Published : 2013.10.01
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Abstract

The isothermal flow structure and mixing characteristics of a hybrid/dual swirl jet combustor for micro-gas turbine (MGT) were numerically investigated. Location of pilot burner, swirl angle and direction were varied as main parameters with the identical thermal load. As a result, the variations in location of pilot nozzle, swirl angle and direction resulted in the significant change in turbulent flow field near burner exit, in particular, center toroidal recirculation zone (CTRZ) as well as turbulent intensity, and thus the flame stability and emission performance might be significantly changed. With the comparison of experimental results, the case of swirl angle $45^{\circ}$ and co-swirl flow including optimum location of pilot burner were chosen in terms of the flame stability and emissions for the development of hybrid/dual swirl jet combustor.

마이크로 가스터빈용 하이브리드/이중 선회제트 연소기의 비반응 유동 및 혼합특성에 관한 수치해석 연구가 수행되었다. 고정된 열부하에서 pilot 버너의 위치, 선회 각 및 방향이 주요 변수로 검토되었다. 결과로서, pilot 버너의 위치, 선회 각 및 방향의 변화는 버너 출구 근처의 난류 유동장, 특히 중앙 재순환영역 및 난류강도의 큰 변화를 초래하며, 화염안정성 및 배기성능의 큰 변화를 동반하게 된다. 실험결과와의 비교를 통해, 하이브리드/이중 선회제트 연소기의 개발을 위하여 화염안정성 및 배기의 측면에서 pilot 버너의 최적 위치, 선회각$45^{\circ}$ 그리고 정방향 선회유동 조건들이 선택되었다.

Keywords

References

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