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Measurement and decomposition of periodic flow structures downstream of a test turbine

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Abstract

This paper shows the experimental methodology which has been employed for the simultaneous aerodynamic and aeroacoustic analysis of a test turbine by means of a fast-response aerodynamic pressure probe. Two different phase references are used to resolve the fluctuations in time of the velocity and the pressure of phenomena occurring at different and unrelated periodicity. The phase-averaged fields are further post-processed by decomposing them into spatial-temporal Fourier coefficients. The deterministic unsteadiness is then simply represented by a limited number of Fourier coefficients, the physical meaning of which is discussed in details. In particular, this approach has been used to distinguish between propagating and non-propagating noise sources.

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Abbreviations

B :

Number of blades

BPF:

Blade passing frequency

C pt :

Total pressure coefficient

CV:

Corner vortex

EGV:

Exit guide vane

f :

Frequency

FRAPP:

Fast-response aerodynamic pressure probe

IGV:

Inlet guide vane

LPT:

Low-pressure turbine

m :

Circumferential mode

\(\dot{m}\) :

massflow

M :

Mach number

m r :

Reduced massflow = \(\frac{\dot{m}*\sqrt{T_{\rm t,in}/T_{\rm ref}}}{p_{\rm t,in}/p_{\rm ref}}\)

n r :

Reduced rotational speed = \(\frac{\hbox{Rotational\, Speed}}{\sqrt{T_{\rm t,in}/T_{\rm ref}}}\)

p ref :

Reference pressure = 1,013.25 mbar

p t :

Total pressure

PLA:

Phase locked average

r :

Radius

Re :

Reynolds number

T :

Blade passing period

T t :

Total temperature

T ref :

Reference temperature = 288.15 K

u :

Mode rotational speed

UPV:

Upper passage vortex

v :

Velocity

V :

Number of vanes

α :

Flow angle

ρ :

Flow density

〈〉:

Deterministic periodic component

rms:

Root mean square

in:

Test section inlet

−:

Time averaged properties

∼:

Ensemble-averaged properties

′:

Stochastic fluctuating component

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Acknowledgments

Paolo Gaetani and Giacomo Persico from Politecnico di Milano are gratefully acknowledged for their support and manufacturing and calibration of the FRAPP. The authors would like to thank H. P. Pirker and E. Göttlich for operating the compressor station. Thanks to M. Moser for his support. Further, the EU project VITAL, Contract No. AIP4-CT-2004-012271, is acknowledged in which the stage was designed, manufactured and operated.

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Author notes

  1. Davide Lengani

    Present address: DIME, Università di Genova, 16145, Genoa, Italy

Authors and Affiliations

  1. Institute of Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Inffeldgasse 25/A, 8010, Graz, Austria

    Davide Lengani, Thorsten Selic, Andreas Marn & Franz Heitmeir

  2. Industrial Mathematics Institute, Johannes Kepler University Linz, 4040, Linz, Austria

    Stefan Kindermann

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  1. Davide Lengani
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Correspondence to Andreas Marn.

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Lengani, D., Kindermann, S., Selic, T. et al. Measurement and decomposition of periodic flow structures downstream of a test turbine. Exp Fluids 55, 1632 (2014). https://doi.org/10.1007/s00348-013-1632-1

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