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Diffuser (thermodynamics) A diffuser is a device for reducing the velocity and increasing the static pressure of a fluid passing through a systemâ. Diffusers are used to slow the fluid's velocity while increasing its static pressure. The fluid's static pressure rise as it passes though a duct is commonly referred to as pressure recovery.
Supersonic Diffusers. A supersonic diffuser is a duct that decreases in size in the direction of flow. As the duct decreases in size, fluid temperature, pressure, and density increase, while velocity decreases. Compressible flow is responsible for these changes in pressure, velocity, density, and temperature.