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Off-Design Performance Prediction of a Gas Turbine Engine

가스터빈 기관의 탈설계점 해석

  • 강동진 (영남대학교 기계공학과) ;
  • 류제욱 (한국중공업, 터보발전기 설계실) ;
  • 정평석 (영남대학교 기계공학과)
  • Published : 1993.07.31

Abstract

A procedure for the prediction of the off-design performance of a gas turbine engine is proposed. The system performance at off-design speed is predicted by coupling the thermodynamic models of a compressor and a turbine. The off-design performance of a compressor is obtained using the stage-stackimg method, while the Ainlay-Mathieson method is used for a turbine. The procedure is applied to a single-shaft gas turbine and its predictability is found satisfactory. The results also show that the net work output increases with the increase of the turbine inlet temperature, while the thermal efficiency is marginal. The maximum thermal efficiency at design point is obtained between the highest pressure ratio and design pressure ratio.

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