Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Optimization of Fan-Shaped Hole for Gas Turbine Blade on Thin Wall

가스터빈 블레이드의 얇은 벽에서의 팬 형상 홀 최적화

  • Received : 2021.05.17
  • Accepted : 2021.07.08
  • Published : 2021.08.31
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Abstract

Several cooling techinques have been studied for protecting gas turbine blades from hot gas. In terms of film-cooling techniques, various shapes of film cooling holes have been studied including fan shaped holes, which are used on gas turbine blades. However, owing to increasing demands on smaller gas turbines, a research on film-cooling holes on thin walls is required. This study was conducted at blowing ratios of 1 and 2, using numerical analysis. Through the numerical analysis, the effect of geometrical parameters on the effectiveness of fan-shaped hole film cooling was studied. Moreover, optimization was performed on three geometrical parameters: metering length, lateral expansion angle and forward expansion angle. As a result, we realized that the optimal fan-shaped holes on each blowing ratio were found to have very similar geometry and cooling performance.

가스터빈 블레이드를 고온의 주유동으로부터 보호하기 위해 다양한 냉각 기법이 연구되었고, 팬 형상 홀을 포함한 다양한 막냉각 홀 형상에 대해서도 연구가 수행되어왔다. 하지만, 소형 가스터빈에 대한 수요가 증가함에 따라 얇은 벽에 적용할 수 있는 막냉각 홀에 대한 연구가 필요하다. 이에 따라 본 연구에서는 수치해석을 통하여 분사율 1과 2에서 팬 형상 홀의 형상 변수의 영향을 연구하였다. 또한, 원형부 길이와 전방향 및 횡방향 확장각, 세 가지 변수에 대하여 최적화를 수행하였다. 각 분사율에서 최적화된 두 형상은 유사한 형상 변수와 냉각 성능을 갖는 것으로 나타났다.

Keywords

Acknowledgement

본 연구는 2019년도 정부(산업통상자원부)의 재원으로 한국에너지기술평가원의 지원을 받아 수행된 연구입니다(20193310100030). 또한, 2020년도 산업통상부의 재원으로 수행한 한국에너지기술평가원(KETEP)의 인력양성사업(No. 20204030200110) 일환으로 수행되었으며, 이에 감사드립니다.

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