A nozzle shapes a passage to control the speed and direction of a fluid flow. In compressible flow, converging-diverging passages can accelerate a gas through a sonic flow throat into supersonic flow.
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A nozzle is a device designed to control the direction or characteristics of a fluid flow as it exits an enclosed chamber or pipe. Nozzles are commonly used in various applications, including: 1. **Aerospace and Aviation**: In jet engines, nozzles help to accelerate exhaust gases, providing thrust. In rocket engines, they are critical for directing high-speed gases to create lift-off.