Engine exhaust/blade interaction noise suppression

Details Engine exhaust/blade interaction noise suppression Engine exhaust/blade interaction noise suppression

1991-07-01

1993-03-30

Look, Edward K.

Rotary kinetic fluid motors or pumps

Selectively adjustable vane or working fluid control means

Upstream of runner

415119, 415183, 415185, F01B 2502

Patent

active

051978555

ABSTRACT:
Noise is reduced on an aircraft engine of the type having aft mounted propeller blades 10 which pass through exhaust gas streams 20 expelled from circumferentially spaced nozzles 14. The nozzles 14 are rotated, or the exhaust flow deflected, such that the high velocity exhaust streams 20a expelled from the nozzles 14 are directed away from their normal axial direction to impact the blades 10 at the same relative angle of attack 36a as the relative angle of attack 34 of the low velocity ambient air stream 22 thereby reducing fluctuations in blade lift and the associated noise.

REFERENCES:
patent: 3613827 (1971-10-01), Labussiere
patent: 4738589 (1988-04-01), Wright
patent: 4864820 (1989-09-01), Wynosky et al.
patent: 4883240 (1989-11-01), Adamson et al.
Metzger, F. B.: "Aerodynamics and Acoustics of Propellers", paper presented at conference of NATO's Advisory Group for Aerospace Research & Development, Oct. 1-4, 1984.

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