Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Performance and structural analysis of a radial inflow turbine for the organic Rankine cycle

유기랭킨사이클용 반경류 터빈의 성능 및 구조 해석

  • Kim, Do-Yeop (Nuclear Power Equipment Research Center, Korea Maritime and Ocean University) ;
  • Kim, You-Taek (Division of Marine System Engineering, Korea Maritime and Ocean University)
  • Received : 2016.04.22
  • Accepted : 2016.07.04
  • Published : 2016.07.31
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Abstract

The turbine is an important component and has a significant impact on the thermodynamic efficiency of the organic Rankine cycle. A precise preliminary design is essential to developing efficient turbines. In addition, performance analysis and structural analysis are needed to evaluate the performance and structural safety. However, there are only a few exclusive studies on the development process of the radial inflow turbines for the organic Rankine cycle (ORC). In this study, a preliminary design of the ORC radial inflow turbine was performed. Subsequently, the performance and structural analysis were also carried out. The RTDM, which was developed as an in-house code, was used in the preliminary design process. The results of the performance analysis were found to be in good agreement with target performances. Structural analysis of the designed turbine was also carried out in order to determine whether the material selection for this study is suitable for the flow conditions of the designed turbine, and it was found that the selected aluminum alloy is suitable for the designed turbine. However, the reliability of the preliminary design algorithms and numerical methods should be strictly verified by an actual experimental test.

유기랭킨사이클의 열역학적 효율에 지대한 영향을 미치는 구성요소는 터빈이며, 성능이 우수한 터빈의 원활한 개발을 위해서는 정밀한 예비설계 뿐만 아니라 성능 예측을 위한 유동해석과 구조적인 안전성을 평가하기 위한 구조해석이 필수적이다. 그러나 현재 이러한 포괄적인 유기랭킨사이클용 반경류 터빈에 대한 개발 내용을 포함한 연구사례를 찾아보기 힘들다. 본 연구에서는 유기랭킨사이클용 반경류 터빈에 대한 예비설계를 수행하고 유동해석 뿐만 아니라 구조해석을 수행하였다. 예비설계에는 인하우스 코드 형태로 개발된 RTDM이 사용되었으며 그 결과는 유동해석 결과로부터 설계목표를 충족하는 것으로 나타났다. 예비 설계한 터빈에 대한 구조해석은 선정한 터빈의 재료가 예비 설계한 터빈의 유동조건에 적합한지 여부를 판단하기 위하여 수행되어야 하며, 구조해석 결과로부터 본 연구에서 선정한 알류미늄 합금은 예비 설계한 터빈의 유동조건에 적합한 것으로 판단되었다. 그러나 예비설계 알고리즘 및 수치해석 기법에 대한 신뢰성은 실증실험을 통하여 엄밀히 검증되어야 할 것으로 판단된다.

Keywords

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