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Journal of Turbomachinery | Volume 136 | Issue 6 | research-article
Research Papers

Experimental Investigation on Aerodynamic Behavior of a Compressor Cascade in Droplet Laden Flow

[+] Author and Article Information
Birger Ober

Laboratory for Turbomachinery,
Department of Power Engineering,
Helmut Schmidt University,
Hamburg 22043, Germany
e-mail: bober@hsu-hh.de

Franz Joos

Laboratory for Turbomachinery,
Department of Power Engineering,
Helmut Schmidt University,
Hamburg 22043, Germany
e-mail: joos@hsu-hh.de

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 17, 2013; final manuscript received August 19, 2013; published online November 28, 2013. Editor: Ronald Bunker.

J. Turbomach 136(6), 061014 (Nov 28, 2013) (8 pages) Paper No: TURBO-13-1161; doi: 10.1115/1.4025690 History: Received July 17, 2013; Revised August 19, 2013
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The possibility to augment the power output of gas turbines by the use of water injection becomes more and more attractive in recent years as unsteadily available renewable energy sources become more present and the need of reserve power rises. Depending on the installed system, water injection may result in a two phase flow inside the compressor. The water droplet laden compressor flow promises benefits in efficiency and to some extent in performance and stability. A promising approach is the stabilizing influence on highly stressed airfoils as experimentally and numerically investigated by different research groups. Multiple numerical investigations have been undertaken by different research groups which found similar results. The ongoing experimental investigation presented in this paper focuses on the influence of a droplet laden flow on an axial compressors' aerodynamics over the range of relevant incidence flow angles. The result of the series of experiments is a comparison of a dry air compressor flow and a droplet laden air compressor flow at high velocity (Ma>0.85). The variables were water load and incidence angle. The discussion will investigate the effects of the presence of water droplet on the compressor cascade's discharge flow properties and their influence on the relevant performance parameters. For this a discussion of the loss coefficient the detailed discharge flow velocity and the axial velocity density ratio will take place.
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Figures

Grahic Jump Location
Fig. 1

Cascade definitions

+Cascade definitions
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Cascade definitions
Grahic Jump Location
Fig. 2

Test rig

+Test rig
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Test rig
Grahic Jump Location
Fig. 3

View into the settling chamber

+View into the settling chamber
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View into the settling chamber
Grahic Jump Location
Fig. 4

Cascade configuration

+Cascade configuration
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Cascade configuration
Grahic Jump Location
Fig. 5

Droplet sixe distribution at inlet

+Droplet sixe distribution at inlet
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Droplet sixe distribution at inlet
Grahic Jump Location
Fig. 6

Traverse definitions

+Traverse definitions
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Traverse definitions
Grahic Jump Location
Fig. 7

Water load 0%: measured normalized discharge velocity for low incidence angles

+Water load 0%: measured normalized discharge velocity for low incidence angles
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Water load 0%: measured normalized discharge velocity for low incidence angles
Grahic Jump Location
Fig. 8

Water load 0%: measured normalized discharged velocity for high incidence angles

+Water load 0%: measured normalized discharged velocity for high incidence angles
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Water load 0%: measured normalized discharged velocity for high incidence angles
Grahic Jump Location
Fig. 9

Water load 1.3%: measured normalized discharge velocity for low incidence angles

+Water load 1.3%: measured normalized discharge velocity for low incidence angles
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Water load 1.3%: measured normalized discharge velocity for low incidence angles
Grahic Jump Location
Fig. 10

Water load 1.3%: measured normalized discharge velocity for high incidence angles

+Water load 1.3%: measured normalized discharge velocity for high incidence angles
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Water load 1.3%: measured normalized discharge velocity for high incidence angles
Grahic Jump Location
Fig. 11

Water load 2.1%: measured normalized discharge velocity for low incidence angles

+Water load 2.1%: measured normalized discharge velocity for low incidence angles
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Water load 2.1%: measured normalized discharge velocity for low incidence angles
Grahic Jump Location
Fig. 16

Influence of water injection on Dehaller number at inlet MA = 0.89

+Influence of water injection on Dehaller number at inlet MA = 0.89
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Influence of water injection on Dehaller number at inlet MA = 0.89
Grahic Jump Location
Fig. 15

Influence of water injection on discharge flow angle at inlet MA = 0.89

+Influence of water injection on discharge flow angle at inlet MA = 0.89
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Influence of water injection on discharge flow angle at inlet MA = 0.89
Grahic Jump Location
Fig. 14

Influence of water injection on loss coefficient at inlet MA = 0.89

+Influence of water injection on loss coefficient at inlet MA = 0.89
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Influence of water injection on loss coefficient at inlet MA = 0.89
Grahic Jump Location
Fig. 13

Influence of water injection on AVDR at inlet MA = 0.89

+Influence of water injection on AVDR at inlet MA = 0.89
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Influence of water injection on AVDR at inlet MA = 0.89
Grahic Jump Location
Fig. 12

Water load 2.1%: measured normalized discharge velocity for high incidence angles

+Water load 2.1%: measured normalized discharge velocity for high incidence angles
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Water load 2.1%: measured normalized discharge velocity for high incidence angles

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