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Blowing models for cooling surfaces
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DOI：10.1016/S1290-0729(01)01283-2.png)
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Abstract
En 中文
To study the cooling of surfaces exposed to high temperature stress and heat flux, the blowing, or trans pi ration, technique is numerically investigated in the case of a porous circular cylinder. Two models are developed to simulate the blowing impact on the outer flow and an experimental set-up available allows for direct comparison and validation of the numerical simulations. The heat exchange occuring within the porous wall itself between the coolant and the solid part of the wall is accounted. The results show an excellent effectiveness of the blowing in terms of surface temperature reduction, even for low blowing ratii. The incident heat flux exhibits a maximum for medium blowing rates due to a decreasing heat transfer coefficient and a growing temperature difference between the surface and the main flow with the injection rate. Finally, the blowing is demonstrated to be very effective in cooling heavily thermally stressed parts in terms of homogeneity and coolant rate required. (C) 2001 Editions scientifiques et medicales Elsevier SAS.
Keywords:
blowing
cooling
cylinder
numerical simulations
boundary layer
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