Research Papers

Experimental and Numerical Investigation of Tip Clearance and Bleed Effects in a Centrifugal Compressor Stage With Pipe Diffuser

[+] Author and Article Information
Robert Kunte

e-mail: kunte@ist.rwth-aachen.de

Peter Jeschke

Institute of Jet Propulsion and Turbomachinery,
RWTH Aachen,
Templergraben 55, 52062 Aachen, Germany

Caitlin Smythe

GE Aviation,
Lynn, MA 01910
e-mail: caitlin.smythe@ge.com

Developed by the German Aerospace Center (DLR) in Cologne.

Contributed by the International Gas Turbine Institute (IGTI) Division of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 5, 2011; final manuscript received August 4, 2011; published online October 18, 2012. Editor: David Wisler.

J. Turbomach 135(1), 011005 (Oct 18, 2012) (12 pages) Paper No: TURBO-11-1099; doi: 10.1115/1.4006318 History: Received July 05, 2011; Revised August 04, 2011

The subject of this paper is the experimental and numerical investigation of a state-of-the-art high pressure centrifugal compressor stage with pipe diffuser for a jet engine application. This study shows the impact of impeller tip clearance- and bleed-variation on the centrifugal stage. The purpose of this paper is threefold. In the first place, it investigates the effects on the stage performance. Secondly, it seeks to explain local flow-phenomena, especially in the diffuser. Finally, it shows that steady CFD simulations are capable of predicting these phenomena. Experimental data were gathered using conventional pitot and three-hole-probes as well as particle-image-velocimetry. Numerical simulations with the CFD solver TRACE were conducted to get fundamental insight into the flow. Thus, this study contributes greatly towards understanding the principle of the flow phenomena in the pipe diffuser of a centrifugal compressor.

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Fig. 1

Geometry of the investigated centrifugal compressor stage with pipe diffuser

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Fig. 2

Vortex generation in the semivaneless space of a pipe diffuser

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Fig. 3

Cross-sectional view of the test rig

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Fig. 4

Derivatives in the test rig

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Fig. 5

3D domains of the numerical model

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Fig. 6

Stage TPR and efficiency comparison

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Fig. 7

Comparison of pt in the quasi-throat plane 4M

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Fig. 8

Comparison of Ma in the diffuser exit plane 6M

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Fig. 9

Diffuser ω and cp comparison

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Fig. 10

Comparison between PIV measurements and CFD (nominal conditions)

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Fig. 11

Comparison between PIV measurement and CFD (TC and NB conditions)

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Fig. 12

Circumferentially flux averaged profiles at impeller outlet (plane 2) and diffuser inlet (plane 3)

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Fig. 13

Δs and ΔMa between NOM and TC

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Fig. 14

Δs and ΔMa between NOM and NB




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