0
TECHNICAL PAPERS

Influence of Blade Leading Edge Geometry on Turbine Endwall Heat (Mass) Transfer

[+] Author and Article Information
S. Han

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

R. J. Goldstein1

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455rjg@me.umn.edu

1

Corresponding author.

J. Turbomach 128(4), 798-813 (Feb 01, 2005) (16 pages) doi:10.1115/1.2221326 History: Received October 01, 2004; Revised February 01, 2005

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 a 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.

Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Test section for the heat transfer experiment

Grahic Jump Location
Figure 2

Blades configuration on the mass transfer endwall

Grahic Jump Location
Figure 3

The geometry of the blade with the fillet

Grahic Jump Location
Figure 4

St number comparison at x∕Cl=0.15

Grahic Jump Location
Figure 5

St number comparison at x∕Cl=0.51

Grahic Jump Location
Figure 6

Sh contour plot (Run-1) with Reex=4.50×105 and Tu=0.2%

Grahic Jump Location
Figure 7

Sh contour plot (Run-2) with Reex=5.82×105 and Tu=0.2%

Grahic Jump Location
Figure 8

Sh contour plot (Run-3) with Reex=4.38×105 and Tu=0.2%

Grahic Jump Location
Figure 9

Sh contour plot (Run-f1) with fillets, Reex=4.31×105 and Tu=0.2%

Grahic Jump Location
Figure 10

Sh contour plot (Run-4) with Reex=5.77×105 and Tu=0.2%

Grahic Jump Location
Figure 11

Sh contour plot (Run-f2) with fillets, Reex=5.65×105 and Tu=0.2%

Grahic Jump Location
Figure 12

Sh number comparison at different streamwise position I

Grahic Jump Location
Figure 13

Sh number comparison at different streamwise position II

Grahic Jump Location
Figure 14

Sh number comparison at different streamwise position III

Grahic Jump Location
Figure 15

Sh number comparison at different streamwise position IV

Grahic Jump Location
Figure 16

Sh number comparison at different streamwise position V

Grahic Jump Location
Figure 17

Sh contour plot (Run-5) with Reex=4.27×105 and Tu=8.5%

Grahic Jump Location
Figure 18

Sh contour plot (Run-6) with Reex=5.67×105 and Tu=8.5%

Grahic Jump Location
Figure 19

Sh contour plot (Run-f3) with fillets, Reex=3.57×105 and Tu=8.5%

Grahic Jump Location
Figure 20

Sh contour plot (Run-f4) with fillets, Reex=4.97×105 and Tu=8.5%

Grahic Jump Location
Figure 21

Sh number comparison at different streamwise position I

Grahic Jump Location
Figure 22

Sh number comparison at different streamwise position II

Grahic Jump Location
Figure 23

Sh number comparison at different streamwise position III

Grahic Jump Location
Figure 24

Sh number comparison at different streamwise position IV

Grahic Jump Location
Figure 25

Sh number comparison at different streamwise position V

Grahic Jump Location
Figure 26

Integrated (averaged along radial direction) Shavg∕Reex0.5 at different streamwise positions (no fillet)

Grahic Jump Location
Figure 27

Integrated (averaged along radial direction) Shavg∕Reex0.5 at different streamwise positions (fillet)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In