1단 터빈 내 선단부 변형의 영향 하에 공력 특성에 대한 비정상 수치해석적 연구 : Numerical Study on the Unsteady Flow Characteristics under the Effect of Blade Leading Edge Modification in the 1st Stage of Axial Turbine
Numerical Study on the Unsteady Flow Characteristics under the Effect of Blade Leading Edge Modification in the 1st Stage of Axial Turbine
- 주제(키워드) Unsteady(비정상) , Aerodynamics(공기역학) , Numerical Study(수치해석) , Turbine(터빈) , Leading Edge(앞전)
- 발행기관 한국유체기계학회
- 발행년도 2009
- 총서유형 Journal
- UCI G704-001212.2009.12.1.002
- KCI ID ART001315787
- 본문언어 한국어
초록/요약
The important problems that arise in the design and performance of the axial flow turbine are the prediction and control of secondary flows. Some progresses have been made on understanding flow conditions that occur when the inlet endwall boundary layer separates at the point in the endwall and rolls up into the horseshoe vortex. And the flows though an axial turbine tend to be extremely complex due to its inherent unsteady and viscous phenomena. The passing wakes generated from the trailing edge of the stator make an interaction with the rotor. Unsteady flow should be considered rotor/stator interactions. The main purpose of this research is control of secondary flow and improvement efficiency in turbine by leading edge modification in unsteady state. When the wake from the stator ran into the modified leading edge of the rotor, the leading edge generated the weak pressure fluctuation by complex passage flows. In conclusion, leading edge modification(bulb2) results in the reduced total pressure loss in the flow field.
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