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Research Papers

# Experimental Investigation of Endwall and Suction Side Blowing in a Highly Loaded Compressor Stator Cascade

[+] Author and Article Information
Daniel Nerger1 n2

Institut für Strömungsmechanik, Technische Universität Braunschweig, Bienroder Weg 3, 38106 Braunschweig, Germanyd.nerger@tu-bs.de

Horst Saathoff3

Institut für Strömungsmechanik, Technische Universität Braunschweig, Bienroder Weg 3, 38106 Braunschweig, Germany

Institut für Strömungsmechanik, Technische Universität Braunschweig, Bienroder Weg 3, 38106 Braunschweig, Germany

Volker Gümmer

Rolls-Royce Germany Limited and Company KG, OE-1 Compressors and Fans, Eschenweg 11, 15827 Blankenfelde-Mahlow, Germanyvolker.guemmer@rolls-royce.com

Carsten Clemen

Rolls-Royce Germany Limited and Company KG, OE-1 Compressors and Fans, Eschenweg 11, 15827 Blankenfelde-Mahlow, Germany

1

Corresponding author.

2

Also with Witt & Sohn AG.

3

Also with Siemens AG, Energy Sector.

J. Turbomach 134(2), 021010 (Jun 23, 2011) (12 pages) doi:10.1115/1.4003254 History: Received October 03, 2010; Revised November 02, 2010; Published June 23, 2011; Online June 23, 2011

## Abstract

The following paper describes an experimental investigation of a highly loaded stator cascade with a pitch to chord ratio of $t/l=0.6$. Experiments without as well as with active flow control by means of endwall and suction side blowing were conducted. Five-hole-probe measurements in pitchwise and spanwise directions as well as endwall oil flow visualizations were carried out in order to determine the performance of the cascade and to analyze the flow phenomena occurring. To quantify the effectivity of the active flow control method, taking the additional energy input into account, corrected losses and an efficiency, which relates the difference of flow power deficit with and without active flow control to the flow power of the blowing jet itself, were evaluated. Even though an increase of static pressure rise could be achieved, a decrease of the total pressure losses was possible for a few operating points only.

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## Figures

Figure 1

Stator cascade with geometrical parameters and measurement planes

Figure 2

Test arrangement with secondary air system; F—volume flow, T—temperature, and P—pressure

Figure 3

Slot configuration for endwall blowing

Figure 4

Slot configuration for suction side blowing

Figure 5

Figure 6

Slot total pressure losses in dependency of jet mass flow

Figure 7

Relation between jet mass flow and jet velocity

Figure 8

Passage averaged cascade characteristics for different inlet flow angles β1 without active flow control

Figure 9

Figure 10

Contour plots of outlet flow angle β2 (left hand side) and loss coefficient ζV1 (right hand side) without active flow control at β1=56 deg

Figure 11

Contour plots of outlet flow angle β2 (left hand side) and loss coefficient ζV1 (right hand side) without active flow control at β1=60 deg

Figure 12

Oil flow visualization at profile suction side and endwall without blowing for β1=54 deg (left hand side) and β1=60 deg (right hand side)

Figure 13

Static pressure rise Δp/q1 at β1=60 deg

Figure 14

Total pressure losses ζV1,corr at β1=60 deg: white symbols—corrected and grey symbols—uncorrected

Figure 15

Blowing efficiency ηB at β1=60 deg

Figure 16

Distributions of cascade characteristics along blade span with blowing at β1=60 deg: only suction side—ṁj/ṁ1=1.6%, only endwall—ṁj/ṁ1=1.6%, and combined—ṁj/ṁ1=0.8%+0.8%

Figure 17

Contour plots of outlet flow angle β2 (left hand side) and loss coefficient ζV1,corr (right hand side) with active flow control at β1=60 deg, only endwall—ṁj/ṁ1=1.6%

Figure 18

Contour plots of outlet flow angle β2 (left hand side) and loss coefficient ζV1,corr (right hand side) with active flow control at β1=60 deg, only suction side—ṁj/ṁ1=1.6%

Figure 19

Contour plots of outlet flow angle β2 (left hand side) and loss coefficient ζV1,corr (right hand side) with active flow control at β1=60 deg, combined—ṁj/ṁ1=0.8%+0.8%

Figure 20

Passage averaged cascade characteristics for different inlet flow angles β1 without and with blowing

Figure 21

Oil flow visualization of profile suction side with active flow control at β1=60 deg: top—only suction side, ṁj/ṁ1=1.6%; middle—only endwall, ṁj/ṁ1=1.6%; and bottom—combined, ṁj/ṁ1=0.8%+0.8%

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