Aerodynamic performance of winglets covering the tip gap inlet in a turbine cascade
- Authors
- Lee, Sang Woo; Kim, Seon Ung; Kim, Kyoung Hoon
- Issue Date
- Apr-2012
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Turbine cascade; Plane tip; PS winglet; LEPS winglet; Winglet width; Aerodynamic loss
- Citation
- INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, v.34, pp 36 - 46
- Pages
- 11
- Journal Title
- INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
- Volume
- 34
- Start Page
- 36
- End Page
- 46
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/21973
- DOI
- 10.1016/j.ijheatfluidflow.2011.11.008
- ISSN
- 0142-727X
1879-2278
- Abstract
- The aerodynamic performance of two different kinds of winglets covering the tip gap inlet of a plane tip, a "pressure-side" (PS) winglet and a "leading-edge and pressure-side" (LEPS) winglet, has been investigated in a turbine cascade. For a tip gap height-to-chord ratio of h/c = 2.0%, their width-to-pitch ratio is changed to be w/p = 2.64, 5.28, and 10.55%. The PS winglet reduces aerodynamic loss in the tip leakage vortex region as well as in an area downstream of the winglet-pressure surface corner, whereas it increases aerodynamic loss in the central area of the passage vortex region. The additional leading-edge winglet portion of the LEPS winglet reduces aerodynamic loss considerably on the casing wall side of the passage vortex region but delivers a noticeable aerodynamic loss increase on its mid-span side. These local trends are deepened with increasing w/p. However, the mass-averaged aerodynamic loss reductions by installing the PS and LEPS winglets in comparison with the baseline no winglet data are only marginal even for w/p = 10.55% and found much smaller than that by employing a cavity squealer tip. (C) 2011 Elsevier Inc. All rights reserved.
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Collections - Department of Mechanical Engineering > 1. Journal Articles
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