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Experimental investigations of flow field and heat transfer characteristics due to periodically pulsating impinging air jets

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Abstract

The paper concentrates on increasing convective heat transfer due to periodically pulsating impinging air jets. A maximum enhancement rate of cooling effectiveness up to 20% could be detected at an excitation Strouhal number of Sr = 0.82 when using a high pulsation magnitude. Reductions up to 5% occured at low Strouhal numbers with coincident high pulsation magnitudes as well. The thermal results were completed with phase-locked flow field investigations by means of PIV and surface visualizations using the oil film method.

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Abbreviations

A :

flow pulsation magnitude (nozzle exit) (–)

d :

nozzle diameter (m)

f :

frequency of excitation (Hz)

l :

nozzle length (m)

N :

number of time traces (–)

n :

number of samples per time trace (−)

Re :

Reynolds number (–)

Sr :

Strouhal number of excitation (–), \(Sr=\frac{f\cdot{d}}{v}\)

s :

thickness of the impingement plate (m)

T aw :

adiabatic wall temperature (°C)

T Cold :

cooling air temperature (°C)

T D :

dimless nozzle-to-nozzle spacing T D  = x D /d (–)

T Hot :

heater temperature (°C)

T Wall :

wall temperature of impingement plate (°C)

w :

mean jet exit velocity (m/s)

x D :

nozzle-to-nozzle distance (m)

y :

nozzle-to-plate distance (m)

ɛ:

cooling effectiveness (–), \(\varepsilon=\frac{T_{\rm Wall}-T_{\rm Hot}}{T_{\rm Hot}-T_{\rm Cold}}\)

Δɛ:

uncertainty of cooling effectiveness (–)

λ:

impingement plate thermal conductivity (W/mK)

Ω:

vorticity (1/s)

0 Hz:

without excitation

d :

diameter

EX:

Excitation

f :

with excitation

max:

Maximum

P :

periodic

SP:

Stagnation Point

th:

theoretical

′:

fluctuation

−:

mean

\(\widehat{ }\) :

ensemble averaged

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Acknowledgments

This research was supported by the German Ministry of Economics and Technology (Project no. 10024592) in cooperation with Rolls-Royce Germany Ltd & Co KG. Thanks to Dr. Andre Brunn for PIV-System support.

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Authors and Affiliations

  1. Institut für Luft- und Raumfahrt, Technische Universität Berlin, Marchstrasse 12, 10587, Berlin, Germany

    T. Janetzke & W. Nitsche

  2. Rolls-Royce Germany Ltd & Co KG, Turbine Aerodynamics and Cooling, Eschenweg 11, 15827, Blankenfelde-Mahlow, Germany

    J. Täge

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  1. T. Janetzke
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  2. W. Nitsche
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  3. J. Täge
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Correspondence to T. Janetzke.

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Janetzke, T., Nitsche, W. & Täge, J. Experimental investigations of flow field and heat transfer characteristics due to periodically pulsating impinging air jets. Heat Mass Transfer 45, 193–206 (2008). https://doi.org/10.1007/s00231-008-0410-8

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