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Compressible flow through nozzles and diffusers is a behavior that occurs when the speed of gas reaches or exceeds the speed of sound. Understanding this behavior is important for the proper design of devices and engines.
Compressible gas jets are used in various energy converting units, such as: Steam and gas turbines Compressor installations Jet and rocket engines Gas ejecting devices
The Schlieren system is a method for testing compressible flow through wind tunnels. It uses a light source projected into a parabolic mirror that reflects the light through the wind tunnel's window. The light then reflects off another parabolic mirror and back to the camera lens.
Wind tunnels are classified into four categories based on the speed of the air passing through the test section relative to the speed of sound (Mach 1): Subsonic: Mach <0.8 Transonic: Mach 0.8 – 1.2 Supersonic: Mach 1.2 – 5.0 Hypersonic: Mach >5.0
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