Monday, 26 Oct 2020
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Computer simulation of vortices

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Computer simulation of vortices
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Reduced pressure on the top of the blade draws air upwards; this produces a vortex – the blade tip vortex – that is then directed downwards. When other rotor blades subsequently come into contact with these vortices, the 'chopping' or throbbing noise characteristic of helicopters is produced.
Credit: DLR (CC-BY 3.0)