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precooled jet engine
A precooled jet engine is a concept for high speed jet engines that features a cryogenic fuel-cooled heat exchanger immediately after the air intake to precool the air entering the engine. After gaining heat and vapourising in the heat exchanger system, the fuel (e.g. H2) burns in the combustor. Precooled jet engines have never flown but are predicted to have much higher thrust and efficiency at speeds up to Mach 5.5. Precooled jet engines were described by Robert P. Carmichael in 1955.〔(NASA history Other Interests in Hydrogen )〕
Precooled engines avoid needing an air condenser because, unlike Liquid air cycle engines (LACE), precooled engines cool the air without liquefying it.
A precooled engine could be in the powerplant for a space launcher vehicle or for a very long range, very high speed aircraft.
==Advantages of precoolers==
One main advantage of precooling is that, for a given overall pressure ratio, there is a significant reduction in compressor delivery temperature (T3), which delays the onset of the T3 limit as flight speed increases. Consequently, sea-level conditions (corrected flow) can be maintained after the precooler over a very wide range of flight speeds, thus maximizing net thrust even at high speeds.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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