Comparative Effectiveness of a Convection-type and a Radiation-type Cooling Cap on a Turbosupercharger

Frederick J. Hartwig

ene 1946 · National Advisory Committee for Aeronautics

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The convection-type cap that employs a jet of air blowing on the rim of the wheel gave temperature reductions of the order of 150 degrees F when the air flow was increased from 0 to 3 pounds per minute (average flow for a flight installation), and further temperature reductions were attained with increased air flow. With the radiation-type cap in which the cooling air never comes in contact with the turbine wheel, maximum reductions in wheel temperature of 20 to 30 degrees F were attained with air flows up to 3 pounds per minute and no additional cooling was obtained with greater flows.