Geometric and aero-thermal influences on multiholed plate temperature: application on combustor wall

The increase in turbomachine performance implies the augmentation of pressures and working temperatures. Therefore, for the combustion chambers walls, high thermal stresses are involved. Thermomechanical metal properties require the improvement of parietal cooling methods. The multihole cooling method seems to present great potential and interest. By means of infrared thermography, we have studied the geometrical parameters and aero-thermal conditions to determine the optimal multiholed plate geometry, necessary in different combustion zones of combustor walls. For the same air consumption, we can obtain different cooling characteristics in terms of temperature gradient, efficiency and film cooling effect.