Prediction of the thermal behavior of blast-cooled generators by use of a digital computer

The electrical rating of a blast-cooled aircraft generator depends on the flow rate and the temperature of the cooling air supplied. At the present time the nature of this dependence, for any particular machine, is obtained by correlating measurements of the thermal characteristics of the generator of that machine. Each distinct design requires a separate set of measurements. In this paper a different approach is discussed whereby a digital computer is programmed to compute the rating of any blast-cooled generator, given a complete description of the machine geometry. The advantage of this approach is that such a computer routine may be used to predict rating data for machines in the design stage.