The effect of full coverage winglets on tip leakage aerodynamics over the plane tip in a turbine cascade
- Authors
- Lee, Sang Woo; Cheon, Joo Hong; Zhang, Qiang
- Issue Date
- Feb-2014
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Turbine cascade; Plane tip; Full coverage (FC) winglet; Winglet width; Aerodynamic loss; Flow turning
- Citation
- INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, v.45, pp 23 - 32
- Pages
- 10
- Journal Title
- INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
- Volume
- 45
- Start Page
- 23
- End Page
- 32
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/21979
- DOI
- 10.1016/j.ijheatfluidflow.2013.11.006
- ISSN
- 0142-727X
1879-2278
- Abstract
- The effect of full coverage (FC) winglets on tip leakage aerodynamics over the plane tip in a turbine cascade has been investigated with the variation of winglet width (w) up to w/p = 15.83% for a tip gap-to-span (chord) ratio of h/s = 1.36% (h/c = 2.0%). A qualitative tip gap flow model for the FC winglet is suggested on the bases of the near-tip surface flow visualizations. As w/p increases, the passage vortex tends to be weakened meanwhile the tip leakage vortex becomes stronger and wall-jet-like. With an increment of w/p, the mass-averaged aerodynamic loss all over the measurement plane decreases steeply up to w/p = 10.55% and then becomes almost unchanged. Thus, the FC winglet of w/p = 10.55% is considered an optimal one for the plane tip. With respect to the baseline plane tip without winglet, the maximum mass-averaged loss reduction by installing the FC winglet on the plane tip is still somewhat smaller than that by employing the cavity squealer rim on the plane tip surface. (C) 2013 Elsevier Inc. All rights reserved.
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Collections - Department of Mechanical Engineering > 1. Journal Articles
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