Abstract
In supersonic aircraft engines, a suction air is heated aerodynamically, and it causes a deterioration of the fuel efficiency. If liquid hydrogen is used as fuel, its cryogenic heat can be used to precool the suction air prior to the compressor stage. Therefore, the compression work can be reduced. In the present study, authors have considered the ideal precooled engine cycle and analysed the effect of suction cooling thermodynamically. In addition, the characteristics of precooler is discussed by introducing a new efficiency based on the second law of thermodynamics.
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