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Research Papers

Experimental Investigation of a Truncated Pipe Diffuser With a Tandem Deswirler in a Centrifugal Compressor Stage

[+] 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

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Turbomachinery. Manuscript received June 29, 2012; final manuscript received August 20, 2012; published online March 25, 2013. Editor: David Wisler.

J. Turbomach 135(3), 031019 (Mar 25, 2013) (10 pages) Paper No: TURBO-12-1094; doi: 10.1115/1.4007526 History: Received June 29, 2012; Revised August 20, 2012

The subject of this paper is the experimental investigation of three different geometric configurations of the diffusing system in a high pressure centrifugal compressor stage for a jet engine application. The objective of this study is twofold. On the one hand, it seeks to explain the impact of truncating a diffuser and a redesigned tandem deswirler on the global stage performance; on the other hand, it aims to correlate the performance differences with local flow phenomena. For this purpose, a state-of-the-art centrifugal compressor test rig was used. Particle image velocimetry measurements visualize the separation behavior in the pipe diffuser passage. Thereby it is shown that the truncation of the diffuser changed the boundary conditions for the downstream deswirler including a high incidence. Thus, a new tandem deswirler design was implemented and measured. Moreover, the relative position of the two tandem rows is investigated. An optimal relative circumferential position for the stage efficiency and static pressure rise was found. This paper gives fundamental insight into the physical mechanisms of the influence of three geometric configurations in a centrifugal compressor stage, especially in the pipe diffuser and the deswirler. Hence, this study contributes in furthering knowledge of the fundamental principles of flow phenomena in the diffusing system of a centrifugal compressor.

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Figures

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Fig. 1

Tandem row parameterization [1]

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Fig. 2

Geometry and measurement planes of the configurations investigated

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Fig. 3

Cross-sectional view of the test rig

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Fig. 4

Schematic view of the tandem deswirler implementation

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Fig. 5

Performance maps (left normalized total pressure ratio TPRnorm; right efficiency ηt-t,norm)

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Fig. 6

Normalized static pressure rise cp in the diffuser

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Fig. 7

Normalized total pressure loss ω in the diffusing system

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Fig. 8

Color injection in the diffuser pipe

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Fig. 9

PIV measurements in the diffuser pipe (left nominal, right truncated diffuser)

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Fig. 10

Stage efficiency relative to the clocking angle αrel

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Fig. 11

Investigated relative angles αrel

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Fig. 12

cp,norm on SS, PS, and center lines relative to the clocking angle αrel

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