Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Effect on the Flow and Heat Transfer of Endwall by Installation of Cut Pin in Front of Pin-fin Array of Turbine Blade Cooling Passage

가스터빈 블레이드 핀-휜 내부 냉각 유로에 분절핀 설치에 따른 바닥면 유동 및 열전달 특성

  • Choi, Seok Min (Department of Plant Technology Energy Systems Research Division, Korea Institute of Machinery and Materials) ;
  • Kim, Su Won (Power Plant Operation Division, POSCO ENERGY) ;
  • Park, Hee Seung (School of Mechanical Engineering, Yonsei University) ;
  • Kim, Yong Jin (Republic of Korea Navy) ;
  • Cho, Hyung Hee (School of Mechanical Engineering, Yonsei University)
  • Received : 2020.07.17
  • Accepted : 2020.08.23
  • Published : 2020.10.31
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Abstract

The effect of cutted pin in front of pin-fin array was analyzed for increasing the cooling performance of gas turbine blade. The numerical simulations were conducted to figure out the flow and thermal characteristics. The base case which is staggered pin-fin array, cut pin case 1 which has X2/Dp=1.25 cut pin and cut pin case 2 which has X3/Dp=1.75 cut pin were compared. The results showed that cut pin increases the strength of the horseshoe vortex which occurred at the leading edge of pin-fin array. Furthermore, the wake effect is reduced at the trailing edge of pin-fin array. As a result, the heat transfer distribution on the endwall increases. However, the friction factor increases owing to the installation of cut pin, but the thermal performance factor is increased maximum 23.8% in cut pin case 2. Therefore, installation of cut pin will be helpful for increasing the cooling performance of pin-fin array of gas turbine blade.

가스터빈 블레이드의 핀-휜 배열의 냉각 성능을 향상시키기 위하여 분절핀을 설치하여 효과를 분석하였다. 분절핀의 위치에 따른 유동 및 열전달 특성 변화를 수치해석을 통해 분석하였다. 분절핀이 설치되지 않은 엇갈림 핀-휜 배열인 기존형상 와 분절핀이 X2/Dp=1.25 간격 떨어진 분절핀적용형상 1과 X3/Dp=1.75 간격 떨어진 분절핀적용형상 2 를 비교하였다. 해석 결과 분절핀의 설치로 인해 핀-휜 배열 전단부에서 발생하는 말발굽와류의 세기가 강화되는 것을 확인하였다. 또한 핀-휜 배열 후단부에서 발생하는 멤돌이 와류의 세기가 약해지는 것을 확인하였다. 이로 인해 바닥면의 열전달 분포가 크게 상승하는 것을 확인 하였다. 반면 분절핀의 설치로 인해 압력손실은 증가하였으나, 열성능계수는 분절핀 적용형상 2 에서 최대 23.8% 가량 증가하는 것을 확인하였다. 이를 통해 향후 가스터빈 핀-휜 냉각 유로 설계 시 분절핀을 설치하면 냉각 성능이 증대 될 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 2020년도 산업통상부의 재원으로 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 인력양성사업 연구 과제(No.20204030200110)의 연구입니다. 또한, 2019년도 정부(산업통상자원부)의 재원으로 한국에너지기술평가원의 지원을 받아 수행된 연구이며(20193310100030, 3D 프린팅 공정 제어 및 설계 최적화 기법(DfAM) 적용을 통한 F급 이상의 고효율 냉각터빈 고온부품 기술 개발), 이에 감사드립니다.

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