Effects of squealer rim height on heat/mass transfer on the floor of cavity squealer tip in a high turning turbine blade cascade
- Authors
- Kang, Dong Bum; Lee, Sang Woo
- Issue Date
- Aug-2016
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Turbine blade; Cavity squealer tip; Squealer rim height; Tip gap height; Cavity floor; Heat/mass transfer rate
- Citation
- INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.99, pp 283 - 292
- Pages
- 10
- Journal Title
- INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
- Volume
- 99
- Start Page
- 283
- End Page
- 292
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/22014
- DOI
- 10.1016/j.ijheatmasstransfer.2016.03.121
- ISSN
- 0017-9310
1879-2189
- Abstract
- The effects of h(st)/s (squealer rim height-to-span ratio) on heat/mass transfer rate on the floor of the cavity squealer tip have been investigated in a high turning turbine blade cascade by employing the naphthalene sublimation technique along with oil film flow visualizations. Tested squealer rim heights are h(st)/s = 0.00% (plane tip), 0.94%, 1.88%, 3.75%, and 5.63% for a tip gap height-to-span ratio of h/s = 1.02%. For comparison purpose, the tip gap height is changed from h/s = 0.34% to 1.70% for h(st)/s = 3.75%. Heat/mass transfer rate on the cavity floor upstream of the mid-chord is affected by the leading edge tip gap vortices as well as by the reattachment of the incoming tip leakage flow to the cavity floor for lower h(st)/s, as in the plane tip case, whereas it is influenced mainly by the impingement of the incoming tip leakage flow onto the cavity floor near the leading edge for higher h(st)/s. On the other hand, heat/mass transfer rate downstream of the mid-chord is determined by the downwash flow which is entrapped by the suction-side squealer rim. With increasing h(st)/s, average heat/mass transfer rate on the cavity floor decreases steeply at first and then decreases mildly in the same manner as over-tip leakage loss. Average heat/mass transfer rate on the cavity floor is more sensitive to the squealer rim height than to the tip gap height. (C) 2016 Elsevier Ltd. All rights reserved.
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Collections - Department of Mechanical Engineering > 1. Journal Articles
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