Tip Leakage Flow and Loss in a Turbine Cascade Equipped with Overhang Squealer Tips
- Authors
- Bong, Seon Woo; Hong, In Hwan; Lee, Sang Woo
- Issue Date
- Jul-2018
- Publisher
- KOREAN SOC MECHANICAL ENGINEERS
- Keywords
- Turbine Cascade; Overhang Squealer Tip; Squealer Rim Height; Tip Leakage Flow; Aerodynamic Loss
- Citation
- TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS B, v.42, no.7, pp 493 - 502
- Pages
- 10
- Journal Title
- TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS B
- Volume
- 42
- Number
- 7
- Start Page
- 493
- End Page
- 502
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/21940
- DOI
- 10.3795/KSME-B.2018.42.7.493
- ISSN
- 1226-4881
- Abstract
- Tip leakage flow and loss over an overhang squealer tip have been investigated in a turbine blade cascade for a tip gap-to-span ratio of h/s = 1.0%. For an overhang width-to-pitch ratio of 9.9%, squealer rim-height-to-span ratio is changed to be h(st)/s = 0.94%, 1.88%, 3.75%, and 5.63%. The present oil film surface flow visualization provides qualitative flow patterns over the tip surface of the overhang squealer tip. Three-dimensional flow measurements show that the mass-averaged total pressure loss coefficient increases in linear proportion to hst/s. The mass-averaged loss for the overhang squealer tip is lower than that for the plane tip by 7.8% in the case of the lowest squealer rim of h(st)/s = 0.94% but becomes larger than that for the plane tip in the case of h(st)/s = 5.63%. In the reduction of tip leakage loss, the overhang squealer tip with trailing edge opening performs better than the overhang squealer tip with trailing edge closure.
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Collections - Department of Mechanical Engineering > 1. Journal Articles
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