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Research Papers

An Experimental Study of Vane Clocking Effects on Embedded Compressor Stage Performance

[+] Author and Article Information
Nicole L. Key, Patrick B. Lawless, Sanford Fleeter

 Purdue University, West Lafayette, IN 47907

J. Turbomach 132(1), 011018 (Sep 21, 2009) (10 pages) doi:10.1115/1.3072714 History: Received September 18, 2008; Revised October 20, 2008; Published September 21, 2009

Previous research has shown that vane clocking, the circumferential indexing of adjacent vane rows with similar vane counts, can be an effective means to increase stage performance, reduce discrete frequency noise, and/or reduce the unsteady blade forces that can lead to high cycle fatigue. The objective of this research was to experimentally investigate the effects of vane clocking in an embedded compressor stage, focusing on stage performance. Experiments were performed in the intermediate-speed Purdue three-stage compressor, which consists of an IGV followed by three stages. The IGV, Stator 1, and Stator 2 vane rows have identical vane counts, and the effects of vane clocking were studied on Stage 2. Much effort went into refining performance measurements to enable the detection of small changes in stage efficiency associated with vane clocking. At design loading, the change in stage efficiency between the maximum and minimum efficiency clocking configurations was 0.27 points. The maximum efficiency clocking configuration positioned the Stator 1 wake at the Stator 2 leading edge. This condition produced a shallower and thinner Stator 2 wake compared with the clocking configuration that located the wake in the middle of the Stator 2 passage. At high loading, the change in Stage 2 efficiency associated with vane clocking effects increased to 1.07 points; however, the maximum efficiency clocking configuration was the case where the Stator 1 wake passed through the middle of the downstream vane passage. Thus, impingement of the upstream vane wake on the downstream vane leading edge resulted in the best performance at design point but provided the lowest efficiency at an off-design condition.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 7

Stator 1 wake profiles at 70% and 80% spans at design loading

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Figure 8

Stator 2 wake profiles at 70% and 80% spans at design loading

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Figure 9

Stator 1 and Stator 2 total temperature profiles at design loading

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Figure 10

Total temperature profiles acquired with larger sample populations

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Figure 11

Average Stage 2 total temperature ratio as measured on five different days at design loading

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Figure 12

The effect of vane clocking on Stage 2 performance at design loading

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Figure 13

Steady Stator 2 inlet total pressure, Po2/Po-inlet, at high loading

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Figure 14

Stator 2 exit total pressure field, Po3/Po-inlet, at high loading

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Figure 15

Circumferentially averaged Stator 1 exit total pressure at high loading

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Figure 16

Stator 1 wake profiles at 12% and 50% spans at high loading

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Figure 17

Circumferentially averaged Stator 2 exit total pressure at high loading

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Figure 18

Stator 2 wake profiles at high loading

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Figure 19

Time-averaged axial velocity distribution at the Stator 2 inlet at high loading

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Figure 20

Average Stage 2 total pressure ratio for all clocking configurations at high loading

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Figure 21

Average Stage 2 total temperature ratio at high loading as measured on five different days

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Figure 22

Vane clocking effects on Stage 2 efficiency at design and high loading conditions

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Figure 1

Clocking configurations for maximum and minimum efficiencies, according to literature

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Figure 2

Overall compressor performance at a corrected speed of 5000 rpm

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Figure 3

Stator 2 inlet total pressure, Po2/Po-inlet, at design

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Figure 4

Stator 2 exit total pressure, Po3/Po-inlet, for all six clocking configurations at design loading

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Figure 5

Circumferentially averaged Stage 2 total pressure ratio at design loading

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Figure 6

Circumferentially averaged Stator 1 exit total pressure at design loading

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