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Numerical study of impinging jets with heat transfer-inlet conditions effects
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2009 (English)In: 47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2009, 2009-1578- p.Conference paper (Refereed)
Abstract [en]

Inflow conditions for time dependent flow configurations are of major importance for the developing flow field and mixing characteristics. The wall heat transfer rates for impinging jets may be significantly affected by perturbations at the jet nozzle. This effect, however, depends on the plate distance to nozzle spacing. For large enough distance to nozzle spacing the influence of the inlet conditions is less significant at the target plate. By applying active forcing at the velocity inlet the wall heat transfer at the impingement plate may be controlled. The forcing here is sinusoidal and it is applied only in the streamwise direction at the velocity inlet of a circular nozzle. The computations included a range of Reynolds numbers (4500 to 30 000) and a range of nozzle-to-plate spacings (0.5 to 12). Here, we consider mainly a case of Re = 20000 and plate distance of two jet diameters. The Turbulent flow and mixing is modeled using Large Eddy Simulation (LES). The results are obtained on rather fine grids and some of the results are compared to relevant experimental data. The sensitivity of the results to inlet conditions shows that direct comparison with experimental results may not be easy or conclussive. However, the LES results agree well with the experimental ones, i.e. within the expected variations (due to uncertainties in inlet conditions) in the different results.

Place, publisher, year, edition, pages
2009. 2009-1578- p.
Keyword [en]
Circular nozzles, Developing Flow, Experimental data, Fine grids, Impinging jet, Inflow conditions, Inlet conditions, Jet diameter, Jet nozzle, Mixing characteristics, Nozzle-to-plate spacing, Numerical studies, Streamwise directions, Target plates, Time-dependent flow, Wall heat transfer, Aerospace engineering, Atmospheric boundary layer, Heat transfer, Intake systems, Reynolds number, Nozzles
National Category
Vehicle Engineering
URN: urn:nbn:se:kth:diva-152368ScopusID: 2-s2.0-78549281425ISBN: 978-156347969-4OAI: diva2:750833
47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 5 January 2009 through 8 January 2009, Orlando, FL, United States

QC 20140930

Available from: 2014-09-30 Created: 2014-09-26 Last updated: 2014-09-30Bibliographically approved

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