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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

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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References

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Eisfeld, T., and Joos, F., 2011, “On Thermodynamic Modeling of Two-Phase Flow Compression With Dispersed Water Droplets in Air,” Paper No. ISROMAC-14 2012.
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Eisfeld, T., and Joos, F., 2010, “Experimental Investigation of the Aerodynamic Performance of a Linear Axial Compressor Cascade With Water Droplet Loading,” ASME Paper No. GT2010-22831. [CrossRef]
Brun, K., Kurz, R., and Simmons, H. R., 2006, “Aerodynamic Instability and Life-Limiting Effects of Inlet and Interstage Water Injection Into Gas Turbines,” ASME J. Eng. Gas Turbines Power, 128, pp. 617–625. [CrossRef]
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Mundo, C., 1996, “Zur Sekundaerzerstaeubung Newtonscher Fluide an Oberflaechen,” Ph.D. thesis, University Erlangen-Nuernberg, Germany.
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Oertel, H., Jr., 2008, Prandtl—Fuehrer Durch die Stroemungslehre, Vieweg + Teubner Verlag, Wiesbaden, Germany.
Eisfeld, T., and Joos, F., 2009, “New Boundary Layer Treatment Methods for Compressor Cascades,” 8th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics (ETC 8), Graz, Austria, March 23–27.
Ruck, B., 1990, Lasermethoden in der Strömungsmesstechnik, AT-Fachverlag, Stuttgart, Germany.
Tweedt, D. L., 1988, “Experimental Investigation of the Performance of a Supersonic Compressor Cascade,” NASA Technical Memorandum 100879.
Köller, Ulf, 1999, “Entwicklung Einer Fortschrittlichen Profilsystematik für Stationäre Gasturbinenverdichter,” Forschungsbericht DLR e. V., 20, pp. 21–22.
Joos, F., and Storm, C., 2011, Euler-Lagrange Method in Numerical Simulation of Water Droplet-Laden Compressor Flows, 20th International Symposium of Air Breathing Engines (ISABE 2011), Gothenburg, Sweden, September 12–16.

Figures

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Fig. 1

Cascade definitions

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Fig. 3

View into the settling chamber

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Fig. 4

Cascade configuration

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Fig. 5

Droplet sixe distribution at inlet

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Fig. 6

Traverse definitions

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Fig. 7

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

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Fig. 10

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

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Fig. 11

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

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Fig. 12

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

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Fig. 13

Influence of water injection on AVDR at inlet MA = 0.89

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Fig. 14

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

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Fig. 15

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

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Fig. 16

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

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Fig. 8

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

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Fig. 9

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

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