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TECHNICAL PAPERS

Design and Test of an Ultralow Solidity Flow-Controlled Compressor Stator

[+] Author and Article Information
K. R. Kirtley, P. Graziosi

 GE Global Research, Niskayuna, NY 12309

P. Wood, B. Beacher, H.-W. Shin

 GE Aircraft Engines, Cincinnati, OH 45215

J. Turbomach 127(4), 689-698 (Mar 01, 2004) (10 pages) doi:10.1115/1.1860374 History: Received October 01, 2003; Revised March 01, 2004

A full annulus fluidic flow-controlled compressor stator ring was designed and tested in the third stage of a four-stage low-speed research compressor. The solidity of the flow-controlled stator was near unity and significantly below design practice with a commensurately high diffusion factor. The design intent was to reduce the vane count by 30% and load the stator to the point of stall at the design point, then employ flow control to restore attached boundary layers and regain design-point stage matching. The flow control applied, which maintained attached flow, was 1% of the compressor mass flow and was introduced via discrete steady jets on the suction side of the stator. The design method used steady Computational Fluid Dynamics (CFD) with the flow control jets simulated to drive stator exit angles, velocities, and blockage to match the baseline machine. The experiment verified the pretest predictions and demonstrated degraded compressor performance without flow control and restoration of the pumping characteristics of the baseline high solidity compressor when flow control was applied. An assessment of the engine cycle impact of the flow-controlled compressor shows a 2.1 point stage efficiency reduction for the increased loading. Extrapolation of the data and analysis to a high-speed compressor shows a more modest 0.5 point stage efficiency trade.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

(a) Solidity and (b) diffusion factor

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Figure 2

Flow control characteristics versus hole diameter

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Figure 3

Flow-controlled airfoil

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Figure 4

Flow-controlled airfoil installed in stator ring

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Figure 5

Assembled compressor

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Figure 6

Contours of stator 3 wake velocity

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Figure 7

(a) Stator 3 wake profiles, flow control off; and (b) stator 3 wake profiles, flow control on

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Figure 8

Compressor pumping characteristic

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Figure 9

Compressor efficiency characteristic

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Figure 10

Free air cycle model

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Figure 11

Compressor pumping with incremental flow control

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Figure 12

Compressor efficiency with incremental flow control

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Figure 13

Stage casing static pressure rise characteristics

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Figure 14

Stator casing static pressure rise characteristics

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Figure 15

Rotor casing static pressure rise characteristics

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Figure 16

Stator 3 exit air angles

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Figure 17

Rotor inlet relative air angles

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Figure 18

Rotor exit relative air angles

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Figure 19

Stator total pressure drop coefficient

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Figure 20

Rotor total pressure rise coefficient

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Figure 21

Flow-controlled stator cycle model

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Figure 22

Compressor cycle impact map for the LSRC

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