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B03: Impingement cooling by pulsating jet-arrays

Principal investigators:
Dr.-Ing. Frank Haucke ()

Scientist:  Arne Berthold, M.Sc. ()
phone        (030) 314 24426

Summary

The experimental investigation of dynamic impingement cooling employing three-dimensional impingement jet arrays will be continued. The fluid mechanical complexity of the impingement jet interactions will be enhanced by a dynamically forced superimposed crossflow, which will lead to more realistic flow conditions as it is typical for flown through turbine blades. Furthermore, geometrical influence factors, such as curved cooling surfaces and curved flow boundaries, on local convective heat transfer are of special interest as well. In cooperation with the numeric subproject B04 and the controlling subproject B06 a significant reduction of the measurement effort for the parametric variations will be striven for.

1st Funding period 2012 - 2016

Impingement cooling by pulsating jet-arrays

Principal investigators:
Prof. W. Nitsche
Dipl.-Ing. I. Peltzer
Prof. D. Peitsch ()

Summary

Fig. 1: Test rig for dynamic impingement cooling.
Lupe

Dynamic impingement cooling is a promising way for more efficient exploitation of cooling air in highly heat charged environments. In many applications the deployed impinging jets are subjected to cross flow superimposed on the flow field of the transverse jets. The present study describes the initial experimental investigations regarding dynamic heat transfer between a flat surface and an array of up to 49 impingement jets, which are dynamically controlled by changing frequency, duty cycle and phasing. A new test rig was designed and manufactured in order to investigate the interactions of adjacent impingement jets and their impact on forced heat transfer. The test rig satisfies the needs of different measurement techniques. Surface measurements using pressure sensors, thermocouples, hot wires, hot films and liquid crystal thermography are planned for investigating the near wall flow field. Furthermore, the test rig is suitable for efficient flow field measurements between jet orifices and the impingement plate using stereoscopic particle image velocimetry.

Fig. 2: Steady blowing case for 5x5 nozzle jet array: Oil flow visualization VS. wall pressure measurements.
Lupe

Many parameters have to be taken into account during the forthcoming experimental investigations. Among others the following parameters have significant impact on heat transfer and will be varied:

·         nozzle jet arrangement

·         nozzle geometry

·         impingement distance

·         coolant mass flow

·         pulse frequency

·         pulse duty cycle

·         phase shift of excitation of adjacent nozzle jets

The following figures deliver an insight into the complexity of the experimental setup as well as into exemplary results.

Fig. 3: Oil flow visualization for 5x5 nozzle jet array: Steady blowing VS. pulsed blowing.
Lupe
Fig. 4: Snapshots for Liquid Crystal Thermography, 5x5 nozzle jet array: Steady blowing VS. pulsed blowing.
Lupe

Publications

 

Haucke, F.; Nitsche, W.; Wilke, R. & Sesterhenn, J. L., Experimental and Numerical Investigations Regarding Pulsed Impingement Cooling, Deutscher Luft- und Raumfahrt Kongress, Rostock, Germany, 2015

Haucke, F.; Kroll. H.; Peltzer, I. & Nitsche W., Experimental investigation of a 7 by 7 nozzle jet array for dynamic impingement cooling, Active Flow and Combustion Control 2014, 2014, dx.doi.org/10.14279/depositonce-39

Zusatzinformationen / Extras

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Auxiliary Functions

Speaker

Prof. Dr.-Ing. Dieter Peitsch

Managing director

Steffi Stehr
Room ER 102

Office

Steffi Stehr
sec. ER 2-1
Room 107
Hardenbergstr. 36a
10623 Berlin
+49 (30) 314 23110