Scramjet
Jet engine where combustion takes place in supersonic airflow
Scramjet
A scramjet (supersonic combustion ramjet) is a variant of a ramjet airbreathing jet engine in which combustion takes place in supersonic airflow. As in ramjets, a scramjet relies on high vehicle speed to compress the incoming air forcefully before combustion (hence ramjet), but whereas a ramjet decelerates the air to subsonic velocities before combustion using shock cones, a scramjet has no shock cone and slows the airflow using shockwaves produced by its ignition source in place of a shock cone. This allows the scramjet to operate efficiently at extremely high speeds and does not require any moving parts. The operating regime and design of the scramjet results in great practical and technical challenges in their implementation. Because they can only operate in hypersonic airflow (>Mach 5), the aircraft to which they are attached must attain a hypersonic airspeed before the scramjet can be enabled. Any craft moving at such velocities is subject to a great deal of aerodynamic heating, necessitating...
Read on Wikipedia · Image Scramjet_operation.png: en:User:Emoscopes derivative work: Luke490 (talk), CC BY-SA 3.0
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