The purpose of this paper is to investigate a new cooling process of a heated cylinder with confined impacting air jet.
To do this the authors used experience-numerical and numerical-numerical comparisons. The experimental facility, designed and built at the Pau University, consists in air jets impacting around a heated circular cylinder. As the inlet velocity magnitude is low (Vin=4.37 m/s – Machin=0.0125), using a compressible solver for numerical simulations presents a number of difficulties. For this low Mach number configuration, the authors compare the performance of three different solvers in this paper. Two of them are compressible, one based on the finite volume approach and the other on a discontinuous Galerkin method, and the third one is an incompressible solver. Some of the numerical results are compared to experimental data.
Comparisons between the results from 3D and 2D computations support the relevance of 2D models. Some of the numerical results are compared to experimental data.
The confined aspect of the set-up reduces experimental measurement to intrusive measures. It should be noted that the temperature measurement given by thermocouples is always considered as “global” or “average”.
Future aircraft technology will increasingly rely on electrical power. The substitution of mechanical energy by electrical energy will lead to an increasing amount of heat power that need be evacuated. Innovative cooling processes have to be set up according to constraints imposed by the technological design.
The authors thank the University of Pau, Conseil Régional d’Aquitaine and SAFRAN-Turbomeca for their financial support to this work. N. Lantos is acknowledged for his invaluable and daily help in the best use as possible of the elsA software. For her useful help with producing the Gmsh mesh used in the Aghora simulation, the authors wish to express their gratitude to M.-C. Le Pape from ONERA. Part of this research got public financial support from the DGE (Direction Générale des Entreprises) after having been selected by the French clusters Aerospace Valley, ASTech and PEGASE.
Chauchat, N., Schall, E., Mory, M., de la Llave Plata, M. and Couaillier, V.G. (2016), "Cooling of a heating cylinder by confined impacting air jets", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 26 No. 7, pp. 2013-2032. https://doi.org/10.1108/HFF-10-2015-0415
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