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- Title
Winglet geometry effects on tip leakage loss over the plane tip in a turbine cascade.
- Authors
Cheon, Joo Hong; Lee, Sang Woo
- Abstract
The effects of winglet offset distance, winglet coverage, and winglet cross section on the over-tip leakage loss for the plane tip have been investigated experimentally in a turbine blade cascade for a tip gap height-to-span ratio of <italic>h</italic>/<italic>s</italic> = 1.36 %. The results show that the over-tip leakage loss for the full coverage winglet increases steeply with increasing the winglet offset distance. This loss generation is attributed to flow disturbances over the forward-facing and backward-facing steps within the tip gap. The winglet flush mounted to the tip surface provides the best result. With the leading edge winglet portion or without it, the both-side winglet always provides better aerodynamic performance than the corresponding pressure-side winglet or suction-side winglet. Longer coverage of the both-side winglet leads to lower loss. Therefore, the full coverage winglet performs best in the loss reduction for the plane tip. In general, thinner winglet leads to better aerodynamic result, and the winglet cross section having a slant bottom surface with the smallest thickness at its outer end is recommended.
- Subjects
AERODYNAMICS; SCIENTIFIC apparatus &; instruments; AIRPLANE wing design; HEAT transfer
- Publication
Journal of Mechanical Science & Technology, 2018, Vol 32, Issue 4, p1633
- ISSN
1738-494X
- Publication type
Article
- DOI
10.1007/s12206-018-0318-2