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A turbine rotor fan spins at 10,000 RPM. With a diameter fan of 123 inches, it has a circumference (Pi x diameter) of 386 inches meaning it spins so fast on it's outer circumference it goes thru the air at 3,600+ miles per hour (Mach 4.8) , that's a huge amount air displacement and sound comes from air displacement


Briefly: inside a jet engine's core or within its fan shroud, huge quantities of air get sucked through while their flow directions get rapidly changed up. This causes parcels of air to bounce off the walls of the engine passages and off their neighbors, a process that generates random (roaring) noise. In addition, in the center of the engine's core, ...

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