Noise reduction device for rotorcraft

Details Noise reduction device for rotorcraft Noise reduction device for rotorcraft

1995-06-02

1996-10-08

Larson, James

Fluid reaction surfaces (i.e., impellers)

With fluid passage in working member communicating with...

Air and watercraft propellers

244 1N, 244199, B64C 2746

Patent

active

055624146

ABSTRACT:
A noise deduction for a rotorcraft includes a unit to produce compressed air, a drive shaft provided with a first air supply passage in which the compressed air from the air-producing unit flows, and rotor blades provided with second air supply passages in which the air from the first air supply passage flows. In order to eject the compressed air supplied from the rotor blades, ejection nozzles having an ejection adjusting mechanism therein are arranged at respective blade tips of the rotor blades and respective trailing edges thereof in the rotational direction. In operation, the ejection nozzles eject the compressed air to the radial direction of the rotor blades, so that, since the blade tip vortex in the vicinity of the blade tip of the preceding rotor blade is relocated outside the blade tip of the following rotor blade, a direct collision thereof on the vortex can be avoided.

REFERENCES:
patent: 3090584 (1963-05-01), Kuchemann et al.
patent: 3692259 (1972-09-01), Yuan
patent: 4040578 (1977-08-01), Yuan
patent: 5158251 (1992-10-01), Taylor

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