Influence of blade leading edge geometry on turbine endwall heat(mass) transfer

S. Han, Richard J Goldstein

Research output: Contribution to conferencePaper

6 Scopus citations

Abstract

The secondary flows, including passage and other vortices in a turbine cascade cause significant aerodynamic losses and thermal gradients. Leading-edge modification of the blade has drawn considerable attention as it has been shown to reduce the secondary flows. However, the heat transfer performance of a leading-edge modified blade has not been investigated thoroughly. Since a fillet at the leading edge blade is reported to reduce the aerodynamic loss significantly, the naphthalene sublimation technique with a fillet geometry is used to study local heat (mass) transfer performance in a simulated turbine cascade. The present paper compares Sherwood number distributions on an endwall with a simple blade and a similar blade having modified leading-edge by adding a fillet. With the modified blades, a horseshoe vortex is not observed and the passage vortex is delayed or not observed for different turbulence intensities. However, near the blade trailing edge the passage vortex has gained as much strength as with the simple blade for low turbulence intensity. Near the leading edge on the pressure and the suction surface, higher mass transfer regions are observed with the fillets. Apparently the corner vortices are intensified with the leading-edge modified blade.

Original languageEnglish (US)
Pages547-562
Number of pages16
DOIs
StatePublished - Nov 23 2005
EventASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future - Reno-Tahoe, NV, United States
Duration: Jun 6 2005Jun 9 2005

Other

OtherASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future
CountryUnited States
CityReno-Tahoe, NV
Period6/6/056/9/05

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    Han, S., & Goldstein, R. J. (2005). Influence of blade leading edge geometry on turbine endwall heat(mass) transfer. 547-562. Paper presented at ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future, Reno-Tahoe, NV, United States. https://doi.org/10.1115/GT2005-68590