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


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
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Figure 1

Overview of the experimental apparatus

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Figure 2

Detail of the experimental turbine stage

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Figure 3

Detail of the slot location and datum leakage arrangement

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Figure 4

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

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Figure 5

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

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Figure 6

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

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Figure 7

Normalized brake efficiency with varying mass fraction—Experimental

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Figure 8

Normalized efficiency with varying mass fraction—Computational

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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)

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Figure 10

Measured NGV loss coefficient with varying leakage flow

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Figure 11

Measured NGV loss coefficient

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Figure 12

Computational NGV hub surface streamlines

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Figure 13

Relative meridional yaw angle downstream of the rotor

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Figure 14

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

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Figure 15

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

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Figure 16

Effect of slot length on mass flow

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Figure 17

Various seal clearances (dimensions in mm)

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Figure 18

Measured NGV loss coefficient with 0mm clearance and foam backing

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Figure 19

Detail of the slot extension



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