Expansion Tube Tunnel

A wind tunnel for conducting tests at hypervelocity. The fluid (normally air) at high pressure, and usually involving rapid combustion to increase energy, is released by rupturing a diaphragm and accelerating through an evacuated working section containing the model.

The major difference between a shock tube and an expansion tube is that in an expansion tube the isentropic flow is exact.

See also: Hypervelocity, Shock Tunnel, Wind Tunnel.

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Subjects: Aerodynamics