Research Papers

Influence of the Different Design Parameters to the Centrifugal Compressor Tip Clearance Loss

[+] Author and Article Information
Teemu Turunen-Saaresti

e-mail: teemu.turunen-saaresti@lut.fi

e-mail: ahti.jaatinen@lut.fi
Laboratory of Fluid Dynamics,
Institute of Energy Technology,
Lappeenranta University of Technology,
Lappeenranta, Finland

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) Division of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 10, 2011; final manuscript received August 16, 2011; published online October 30, 2012. Editor: David Wisler.

J. Turbomach 135(1), 011017 (Oct 30, 2012) (6 pages) Paper No: TURBO-11-1112; doi: 10.1115/1.4006388 History: Received July 10, 2011; Revised August 16, 2011

In this paper the effect of the tip clearance was studied with six different centrifugal compressors and data available in literature. The changes in the overall performance of the compressor stage were examined. The aim was to study the influence of the different design parameters to the tip clearance loss. It was evident by the previous studies that the sensitivity of the centrifugal compressor to the tip clearance loss varies with different designs. However, for the designer it is important to know the effect of the tip clearance loss in order to initially evaluate the quality of different designs. Analysis of the data demonstrated that no clear correlation between the sensitivity of the tip clearance loss and the specific speed, the diffusion ratio, the blade number and the ratio of blade heights exists.

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Fig. 1

Experimental setup

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Fig. 2

Change of efficiency of compressor stage with different relative tip clearances

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Fig. 3

Slope of efficiency curves versus specific speed

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Fig. 4

Slope of efficiency curves versus diffusion ratio

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Fig. 5

Slope of efficiency curves versus number of blades

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Fig. 6

Slope of efficiency curves versus ration blade heights

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Fig. 7

Pressure ratio versus relative tip clearance

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Fig. 8

Slope of pressure ratio versus specific speed

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Fig. 9

Slope pressure ratio versus diffusion ratio

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Fig. 10

Slope pressure ratio versus number of blades

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Fig. 11

Slope pressure ratio versus ration of blade heights




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