Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Numerical Analysis on the Effect of Hole Arrangement on the Film Cooling Effectiveness on the Vane Endwall

터빈 1단 베인 엔드월에서 막냉각 홀 배열에 따른 막냉각 특성 변화

  • Kim, TaeWoo (Department of mechanical Engineering, Yonsei University) ;
  • Kim, JeongJu (Department of mechanical Engineering, Yonsei University) ;
  • Park, Hee Seung (Department of mechanical Engineering, Yonsei University) ;
  • Ju, Won-Gu (Department of mechanical Engineering, Yonsei University) ;
  • Im, Ju Hyun (Agency for Defense Development) ;
  • Cho, Hyung Hee (Department of mechanical Engineering, Yonsei University)
  • Received : 2019.11.15
  • Accepted : 2019.12.18
  • Published : 2020.02.01
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Abstract

The present study investigates to improve the film cooling performance on the vane endwall. Numerical simulation was conducted to analyze film cooling characteristics on the vane endwall. Six different hole arrangements were designed considering flow characteristics on the endwall. The results showed that the film cooling effectiveness was low on the pressure side and nozzle throat in the base case, because coolant was deflected from the pressure side to the suction side. On the other hand, when the holes were installed near the pressure side, the film cooling effectiveness was enhanced on the pressure side and nozzle throat, because the coolant was less affected by cross flow. Therefore, the film cooling effectiveness increases about 16% compared to the base hole arrangement.

1단 베인 엔드월에서 막냉각 성능을 증가시키기 위해서 본 연구를 진행하였다. 1단 베인에서의 유동 및 막냉각 특성을 분석하기 위해 수치해석을 진행하였고, 유동특성을 고려하여 서로다른 6가지의 막냉각 홀 배열을 설계하였다. 그 결과, 기본형상의 경우 냉각유체가 흡입면으로 편향되면서 압력면과 노즐 목에서 낮은 냉각 효율을 나타냈다. 반면 일부 홀들을 압력면을 따라 설치한 경우, 횡방향 유동이 냉각유체에 미치는 영향이 감소하여 압력면과 노즐 목에서 막냉각 효율이 증가하였다. 이에 기존 막냉각 홀 배열보다 막냉각 효율이 16% 증가하였다.

Keywords

References

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