Abstract
Dynamic forced impingement cooling is investigated experimentally. Due to the pulsation of impinging jets, strong ring vortices can be generated. Thereby, pulse parameters, e.g. frequency, amplitude, duty cycle and phase shift as well as geometrical parameters e.g. impingement distance, jet nozzle distance or jet nozzle arrangement, play an important role on maximizing the heat transfer on hot surfaces. In the present paper the local convective heat transfer on an electrically heated flat plate is being investigated, while under the influence of a 7 by 7 inline impinging jet array. The cooling efficiency of pulsed actuation with side wall induced crossflow is determined by comparing local Nusselt numbers to the steady blowing case.
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Acknowledgements
The authors gratefully acknowledge support by the Deutsche Forschungsgesellschaft (DFG) as part of the collaborative research centre SFB 1029 “Substantial efficiency increase in gas turbines through direct use of coupled unsteady combustion and flow dynamics”.
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Haucke, F., Berthold, A. (2018). Experimental Investigation of a Dynamically Forced Impinging Jet Array. In: Dillmann, A., et al. New Results in Numerical and Experimental Fluid Mechanics XI. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 136. Springer, Cham. https://doi.org/10.1007/978-3-319-64519-3_19
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DOI: https://doi.org/10.1007/978-3-319-64519-3_19
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