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Experimental investigations on steady wake effects in a high-lift turbine cascade

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Abstract

This paper reports on the investigation of steady wake effects in cascades. An annular cascade rig, where two stators having the same blade pitch can be circumferentially traversed relatively to each other, is used to analyse the profile losses and the boundary layer development of the downstream stator for different circumferential positions of the upstream stator (“clocking positions”). Different measurement techniques are used such as three-hole pressure probes, and hot wire- and surface-mounted hot-film probes. The results show a varying pressure loss coefficient of the downstream cascade (S2) for different clocking positions of the upstream cascade (S1_SP).

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Abbreviations

c :

Flow velocity in absolute frame of reference

c m :

Mean flow velocity

clp :

Clocking position

Cp:

Static pressure coefficient

E :

Anemometer output voltage

E 0 :

Anemometer output voltage at zero velocity

G :

Threshold for intermittency calculation

k1:

Turbulent kinetic energy

l(t):

0/1-distribution for intermittency calculation

Ma c :

Mach number based on absolute velocity

P :

Static pressure

P tot :

Total pressure

PS :

Pressure side

S1_SP:

Stator 1

S2:

Stator 2

t :

Pitch, time

T :

Measuring time

S :

Surface length coordinate

S(t):

Detector function

S*(t):

Smoothed detector function

S ges :

Total surface length

SS :

Suction side

x :

Circumferential coordinate

α :

Flow angle

γ :

Intermittency

ω :

Loss coefficient

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Acknowledgements

The present investigation was partly financed and carried out as a part of the German Research program AG TURBO II under the leadership of the German Ministry of Economics and Labour. Further, we would like to acknowledge the financial and technical support of MTU Munich and their scientific advice.

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Authors and Affiliations

  1. Turbomachinery Laboratory (TFA), Darmstadt University of Technology, Petersenstraße 30, 64289 , Darmstadt, Germany

    Wolfram Heinke, Sven König, Berthold Matyschok & Bernd Stoffel

  2. MTU Aero Engines GmbH, Dachauer Str. 665, 80995 , Munich, Germany

    Andreas Fiala & Klaus Heinig

Authors
  1. Wolfram Heinke
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  2. Sven König
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  3. Berthold Matyschok
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  4. Bernd Stoffel
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  5. Andreas Fiala
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  6. Klaus Heinig
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Correspondence to Sven König.

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Heinke, W., König, S., Matyschok, B. et al. Experimental investigations on steady wake effects in a high-lift turbine cascade. Exp Fluids 37, 488–496 (2004). https://doi.org/10.1007/s00348-004-0832-0

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