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High-Speed Jet Facility  The IIT/FDRC High-Speed Jet Facility (HSJF) is a subsonic/supersonic air jet flow facility which is currently being used for research into the physics of a phenomenon known as screech. The maximum stagnation pressure attainable with the present compressed air system is approximately 200 psig which corresponds to a fully expanded Mach number of 2.4 and a Reynolds number of 5.4 million. The jet is designed in a modular fashion to allow replacement of nozzle types and modification of flow conditioning elements. The design of the HSJF isolates the nozzle exit from structure borne vibrations and flow borne acoustic noise. An anechoic chamber surrounds the exit plume region of the jet to simulate a free-field acoustic environment. The chamber has a ducted configuration to allow for the high entrainment rates and to prevent local areas of recirculation which can reintroduce shear-layer disturbances. The HSJF has a proportional-integral-derivative (PID) active feedback controller which maintains a constant stagnation pressure as the supply tank pressure is depleated at supersonic velocities. At low jet velocities the stagnation pressure can be maintained indefinitely through compressor augmentation of the air supply. A high-speed laser shadowgraph/schlieren system has been developed for the HSJF to study the shock cells and disturbances involved in the screech phenomenon. Several photographs produced by this system can be downloaded below.
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