Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Experimental Investigation on the Effect of Low-Speed Icing Condition to the Surface Roughness Formation

저속 결빙조건이 표면 조도 형성에 미치는 영향에 관한 실험적 연구

  • Kang, Yu-Eop (Department of Aerospace Engineering, Seoul National University) ;
  • Min, Seungin (Department of Aerospace Engineering, Seoul National University) ;
  • Kim, Taeseong (Department of Wind Energy, Technical University of Denmark (DTU)) ;
  • Yee, Kwanjung (Institute of Advanced Aerospace Technology, Seoul National University)
  • Received : 2019.09.11
  • Accepted : 2019.12.18
  • Published : 2020.02.01
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Abstract

In the field of aircraft icing prediction, surface roughness has been considered as critical factor because it enhances convective heat transfer and changes local collection efficiency. For this significance, experimental studies have been conducted to acquire the quantitative data of the formation process. Meanwhile, these experiments was conducted under low-speed condition due to the measurement difficulties. However, it has not been investigated that how the flow characteristic of low-speed will effects to the surface roughness. Therefore, the present study conducted experiment under low-speed icing condition, and analyzed the relation between surface roughness characteristics and icing condition. As an analysis method, the dominant parameters used in the previous high-speed experiments are employed, and roughness characteristics are compared. The size of roughness element was consistent with the previous known tendency, but not the smooth zone width.

항공기 결빙 분야에서 표면 조도는 대류 열전달을 강화하고 국소 액적 부착률(Local Collection Efficiency)을 변화시킨다는 점에서 매우 중요한 요소로 받아들여지고 있다. 이에 따라 최근 결빙실험 분야에서는 표면 조도 형성과정 데이터를 획득하기 위한 노력이 진행되고 있다. 한편, 이러한 실험은 데이터 측정의 어려움으로 인해 주로 저속 결빙조건에서 수행되고 있다. 그러나 저속조건이 표면 조도의 최종 형상에 미치는 영향은 아직 거의 알려진 바가 없다. 본 연구는 저속 결빙조건에서 실험을 수행하고, 획득한 표면 조도 데이터와 결빙조건과의 연관성을 분석하였다. 분석 방법으로는 기존 고속조건 실험에 활용되는 지배 파라미터를 이용하였으며, 표면 조도의 경향성을 기존 고속 실험 결과와 비교하였다. 표면 조도 크기는 기존에 알려진 경향성과 잘 일치했지만, smooth zone 폭은 차이를 보이는 것을 확인할 수 있었다.

Keywords

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