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http://dx.doi.org/10.5293/KFMA.2009.12.1.022

Numerical Study on the Unsteady Flow Characteristics under the Effect of Blade Leading Edge Modification in the 1st Stage of Axial Turbine  

Kim, Dae-Hyun (고려대학교 대학원 기계공학과)
Min, Jae-Hong (고려대학교 대학원 기계공학과)
Chung, Jin-Taek (고려대학교 기계공학과)
Publication Information
The KSFM Journal of Fluid Machinery / v.12, no.1, 2009 , pp. 22-27 More about this Journal
Abstract
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.
Keywords
Unsteady; Aerodynamics; Numerical Study; Turbine; Leading Edge;
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  • Reference
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