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- Unstart abstract "Unstart, is technical term used in supersonic aerodynamics to refer to a generally violent breakdown of the supersonic airflow. Original use came about as wind tunnels were designed that could drive the airflow supersonic. 'Starting' the supersonic wind tunnel is therefore 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 are often visualized with schlieren or shadowgraph optical techniques.As airplanes began to achieve supersonic flight, an inlet that delivers proper airflow to an engine became a major complicating element to aircraft design. In a simple sense, these supersonic inlets had to be carefully designed like a supersonic wind tunnel. At high supersonic speeds, (usually between Mach 2 to 3), the inlet is designed to have supersonic flow inside (or downstream) of the air inlet's capture plane. Similar to the supersonic wind tunnel, if the mass flow across the inlet's capture plane does not match the downstream mass flow at the engine, the inlet will unstart. Depending on the design, this can be violent to the airplane and pilot.The SR-71 air inlets were designed for exceptional performance but also had the risk of unstart. Another aircraft with unstart risk was the B-70 Valkyrie. The unstart problem became dramatically evident during the development of the F-107 fighter. Resistance to unstart has become an important element that defines propulsion operability and can be considered analogous to compressor stall for a jet engine.".
- Unstart thumbnail Inlet_shock_waves_at_Mach_2.jpg?width=300.
- Unstart wikiPageID "8886080".
- Unstart wikiPageRevisionID "584132246".
- Unstart hasPhotoCollection Unstart.
- Unstart subject Category:Aviation_risks.
- Unstart type AviationRisks.
- Unstart type CausalAgent100007347.
- Unstart type Danger114541044.
- Unstart type Hazard114541852.
- Unstart type PhysicalEntity100001930.
- Unstart comment "Unstart, is technical term used in supersonic aerodynamics to refer to a generally violent breakdown of the supersonic airflow. Original use came about as wind tunnels were designed that could drive the airflow supersonic. 'Starting' the supersonic wind tunnel is therefore the process in which the air becomes supersonic. Unstart of the wind tunnel is the reverse process.".
- Unstart label "Unstart".
- Unstart sameAs m.027n9r7.
- Unstart sameAs Q7897510.
- Unstart sameAs Q7897510.
- Unstart sameAs Unstart.
- Unstart wasDerivedFrom Unstart?oldid=584132246.
- Unstart depiction Inlet_shock_waves_at_Mach_2.jpg.
- Unstart isPrimaryTopicOf Unstart.
