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덕트 형상 변화가 축류 가스터빈 배기 디퓨져 성능에 미치는 영향
이익상(Iksang Lee),안윤호(Yunho An),김중석(Joung Seok Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this paper, the aerodynamic performance of an axial gas turbine exhaust diffuser is investigated as duct angle is changed. This diffuser consists of an annular diffuser and duct. Steady 3D CFD simulations with SST turbulence model using ANSYS CFX have been carried out to analyze effect of duct angle. The performance of the diffuser was assessed in terms of static pressure coefficient and total pressure loss along the diffuser. Duct angle depended on total length of duct. Performance of exhaust diffuser was significantly improved as duct angles were changed. Also, increasing duct angle and length reduced a range of recirculation zone at duct outlet. It effects on increasing static pressure within whole diffuser system.