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The precooled jet engine is a concept that … The precooled jet engine is a concept that enables jet engines with turbomachinery, as opposed to ramjets, to be used at high speeds. Precooling restores some or all of the performance degradation of the engine compressor (by preventing rotating stall/choking/reduced flow), as well as that of the complete gas generator (by maintaining a significant combustor temperature rise within a fixed turbine temperature limit), which would otherwise prevent flight with high ram temperatures. For higher flight speeds precooling may feature a cryogenic fuel-cooled heat exchanger before the air enters the compressor. After gaining heat and vapourising in the heat exchanger, the fuel (e.g. H2) burns in the combustor. Precooling using a heat exchanger has not been used in flight, but is predicted to have significantly high thrust and efficiency at speeds up to Mach 5.5. Precooled jet engine cycles were analyzed by Robert P. Carmichael in 1955. Pre-cooled engines avoid the need for an air condenser because, unlike liquid air cycle engines (LACE), pre-cooled engines cool the air without liquefying it. For lower flight speeds precooling can be done with mass injection, known as WIPCC (water injection precompressor cooling) This method has been used for short duration (due to limited coolant capacity) increases to an aircraft's normal maximum speed. "Operation Skyburner", which gained a world speed record with a McDonnell Douglas F-4 Phantom II, and the Mikoyan Ye-266 (Mig 25). Both used a water/alcohol spray to cool the air ahead of the compressor. Precooling (as well as combustion chamber water injection) is used at the lowest flight speeds, i.e. during take off, to increase thrust at high ambient temperatures.rease thrust at high ambient temperatures.
, Il motore a getto preraffreddato è una sol … Il motore a getto preraffreddato è una soluzione studiata per raggiungere alte velocità con motori turbogetto che sfrutta il preraffreddamento dell'aria in ingresso immediatamente a valle della presa d'aria mediante uno scambiatore di calore raffreddato dal combustibile criogenico. Dopo aver sottratto calore all'aria mediante l'evaporazione nello scambiatore, il combustibile (in genere H2) viene bruciato in camera di combustione. Motori a getto preraffreddati non hanno ancora volato, ma, sulla carta, hanno una migliore efficienza e potrebbero raggiungere velocità pari a Mach 5,5. Uno dei primi progetti è stato descritto da Robert P. Carmichael nel 1955. A differenza di un motore con ciclo ad aria liquefatta (LACE), il motore preraffreddato non liquefà l'aria ingerita, ma la raffredda solamente. Possibili applicazioni di turbojet preraffreddato sono il lanciatore ATREX, l'aereo ipersonico A2 o lo spazioplano Skylon con i suoi motori SABRE (Synergetic Air-Breathing Rocket Engine). (Synergetic Air-Breathing Rocket Engine).
, 予冷ターボジェットエンジン（Precooled jet engine）はジェットエンジンの一種。
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| rdfs:comment |
予冷ターボジェットエンジン（Precooled jet engine）はジェットエンジンの一種。
, The precooled jet engine is a concept that … The precooled jet engine is a concept that enables jet engines with turbomachinery, as opposed to ramjets, to be used at high speeds. Precooling restores some or all of the performance degradation of the engine compressor (by preventing rotating stall/choking/reduced flow), as well as that of the complete gas generator (by maintaining a significant combustor temperature rise within a fixed turbine temperature limit), which would otherwise prevent flight with high ram temperatures.prevent flight with high ram temperatures.
, Il motore a getto preraffreddato è una sol … Il motore a getto preraffreddato è una soluzione studiata per raggiungere alte velocità con motori turbogetto che sfrutta il preraffreddamento dell'aria in ingresso immediatamente a valle della presa d'aria mediante uno scambiatore di calore raffreddato dal combustibile criogenico. Dopo aver sottratto calore all'aria mediante l'evaporazione nello scambiatore, il combustibile (in genere H2) viene bruciato in camera di combustione. Motori a getto preraffreddati non hanno ancora volato, ma, sulla carta, hanno una migliore efficienza e potrebbero raggiungere velocità pari a Mach 5,5. Uno dei primi progetti è stato descritto da Robert P. Carmichael nel 1955.escritto da Robert P. Carmichael nel 1955.
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| rdfs:label |
予冷ターボジェットエンジン
, Motore a getto preraffreddato
, Precooled jet engine
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