Tip gap flow and aerodynamic loss generation in a turbine cascade equipped with suction-side winglets
- Authors
- Seo, Yong Cheol; Lee, Sang Woo
- Issue Date
- Mar-2013
- Publisher
- KOREAN SOC MECHANICAL ENGINEERS
- Keywords
- Turbine cascade; Plane tip; Suction-side winglet; Winglet width; Winglet geometry; Aerodynamic loss
- Citation
- JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v.27, no.3, pp 703 - 712
- Pages
- 10
- Journal Title
- JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
- Volume
- 27
- Number
- 3
- Start Page
- 703
- End Page
- 712
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/21976
- DOI
- 10.1007/s12206-012-1258-x
- ISSN
- 1738-494X
1976-3824
- Abstract
- The tip gap flow and aerodynamic loss generation over a plane tip equipped with a "constant-width suction-side" (CWSS) winglet and a "varying-width suction-side" (VWSS) winglet have been investigated in a turbine cascade. For a fixed tip gap of h/c = 2.0%, three different winglet widths of w/p = 5.28, 10.55, and 15.83% are tested for the CWSS winglet. The VWSS winglet is designed based on flow visualization and has almost the same winglet area as the CWSS winglet of w/p = 15.83%. In general, the suction-side winglets have a role to increase aerodynamic loss in the tip leakage vortex region but reduce aerodynamic loss in the passage vortex region. For the CWSS winglet, the total-pressure loss coefficient mass-averaged all over the measurement plane has no appreciable changes with increasing w/p from 0.0 to 10.55%, but tends to decrease with further increment of w/p. The VWSS winglet performs better in reducing aerodynamic loss in the passage vortex region than the CWSS winglet of w/p = 15.83% but leads to a little bit higher aerodynamic loss in the tip leakage vortex region. The aerodynamic loss reduction by the VWSS winglet is 7.4% in comparison with the plane tip without winglet, and is about 60% lower than that by the widest CWSS winglet.
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Collections - Department of Mechanical Engineering > 1. Journal Articles
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