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Unstart
In supersonic aerodynamics, unstart refers to a generally violent breakdown of the supersonic airflow. The phenomenon occurs when mass flow rate changes significantly within a duct. Avoiding unstarts is a key objective in design of the engine air intakes of supersonic aircraft.
== Etymology ==
The term originated during the use of early supersonic wind tunnels. “Starting” the supersonic wind tunnel is the process in which the air becomes supersonic; ''unstart'' of the wind tunnel is the reverse process. The shock waves that develop during the starting or unstart process may be visualized with schlieren or shadowgraph optical techniques.
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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