0
TECHNICAL PAPERS

The Interaction of Turbine Inter-Platform Leakage Flow With the Mainstream Flow

[+] Author and Article Information
Kevin Reid1

 Syncrude Canada Ltd., Edmonton, AB Canadareiḏkev@hotmail.com

John Denton, Graham Pullan, Eric Curtis, John Longley

Whittle Laboratory, Department of Engineering, University of Cambridge, Cambridge, UK

1

Corresponding author.

J. Turbomach 129(2), 303-310 (Feb 01, 2005) (8 pages) doi:10.1115/1.2162592 History: Received October 01, 2004; Revised February 01, 2005

Individual nozzle guide vanes (NGV’s) in modern aeroengines are often cast as a single piece with integral hub and casing endwalls. When in operation, there is a leakage flow through the chord-wise interplatform gaps. An investigation into the effect of this leakage flow on turbine performance is presented. Efficiency measurements and NGV exit area traverse data from a low-speed research turbine are reported. Tests show that this leakage flow can have a significant impact on turbine performance, but that below a threshold leakage fraction this penalty does not rise with increasing leakage flow rate. The effect of various seal clearances are also investigated. Results from steady-state simulations using a three-dimensional multiblock Reynolds-averaged Navier-Stokes solver are presented with particular emphasis paid to the physics of the mainstream/leakage interaction and the loss generation.

Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 5

Comparison of experiment and CFD with slot taped over—Meridional yaw angle at Traverse Plane 2

Grahic Jump Location
Figure 1

Overview of the experimental apparatus

Grahic Jump Location
Figure 2

Detail of the experimental turbine stage

Grahic Jump Location
Figure 3

Detail of the slot location and datum leakage arrangement

Grahic Jump Location
Figure 4

CFD geometry (NGV passage and slot/seal/plenum arrangement)

Grahic Jump Location
Figure 6

Comparison of experiment and CFD with no net leakage—Meridional yaw angle at Traverse Plane 2

Grahic Jump Location
Figure 7

Normalized brake efficiency with varying mass fraction—Experimental

Grahic Jump Location
Figure 8

Normalized efficiency with varying mass fraction—Computational

Grahic Jump Location
Figure 9

Mass fraction of fluid exchanged between the mainstream and the plenum—Normalized mass flow=mmerid−minlet∕minlet—(every third point shown for clarity)

Grahic Jump Location
Figure 10

Measured NGV loss coefficient with varying leakage flow

Grahic Jump Location
Figure 11

Measured NGV loss coefficient

Grahic Jump Location
Figure 12

Computational NGV hub surface streamlines

Grahic Jump Location
Figure 13

Relative meridional yaw angle downstream of the rotor

Grahic Jump Location
Figure 14

Comparison of the cumulative entropy generation rates in the annulus and in the plenum

Grahic Jump Location
Figure 15

Distribution of the cumulative entropy generation rate in the slot/strip-seal/plenum

Grahic Jump Location
Figure 16

Effect of slot length on mass flow

Grahic Jump Location
Figure 17

Various seal clearances (dimensions in mm)

Grahic Jump Location
Figure 18

Measured NGV loss coefficient with 0mm clearance and foam backing

Grahic Jump Location
Figure 19

Detail of the slot extension

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