Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
권호 표지

Heat Transfer Characteristics under Recirculation zone of Ramjet Combustor

재순환 영역이 램제트 연소실에서의 열전달 특성에 미치는 영향

  • 이건우 (연세대학교 대학원 기계공학과) ;
  • 오민근 (연세대학교 대학원 기계공학과) ;
  • 함희철 (국방과학연구소 제1기술연구본부) ;
  • 황기영 (국방과학연구소 제1기술연구본부) ;
  • 조형희 (연세대학교 기계공학부)
  • Published : 2007.12.30
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Abstract

This experimental study has been conducted to investigate the effect of the recirculation zone on the multi-slot film cooling in the ramjet combustor. The recirculation zone which is generated by the protrusion tip on the entrance of the coolant flow path affects on the first slot. Velocity fields, dimensionless temperature fields and adiabatic film cooling effectiveness on the downstream wall of the slot exit are measured. The results show that the film cooling performance is rapidly decreased after the slot exit by shear layer and high turbulence intensity between separated flows and coolant flows.

본 연구에서는 램제트 연소실에서의 재순환 유동이 슬롯 막냉각에 미치는 영향에 대하여 실험을 수행하였다. 램제트 연소실 입구의 경사진 확장면 돌출부에 의해 발생된 재순환 유동이 다단 슬롯 중 첫 번째 슬롯에 영향을 미치도록 실험 장치를 구성하여, 슬롯 출구 하류에서의 속도장, 온도장 및 단열 막냉각 효율을 측정하였다. 재순환 유동의 영향에 들어가는 슬롯에서 분사된 냉각유체는 재순환 유동의 높은 전단력과 난류강도로 인해 분사 직후 급격히 주유동과 혼합되어, 재순환 영역에 포함되지 않은 슬롯보다 냉각 성능이 감소함을 결과를 통해 확인하였다.

Keywords

References

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