Porous single expansion ramp

Details Porous single expansion ramp Porous single expansion ramp

1990-10-05

1996-02-13

Dang, Khanh

Acoustics

Sound-modifying means

Muffler, fluid conducting type

F02K 100

Patent

active

054913071

ABSTRACT:
Single expansion ramp to extend from the exhaust opening of a fluid nozzle. A surface of the ramp lying adjacent to fluid flow exhausting the nozzle is porous. The ramp of the present invention reduces the shock wave noise resulting from supersonic flow exhausting the nozzle by causing the formation of weak compression waves in the exhaust plume, which in turn weaken the strength of the standing shock waves in the plume.

REFERENCES:
patent: 2926744 (1960-03-01), Towle et al.
patent: 2959917 (1960-11-01), McGehee
patent: 3437173 (1969-04-01), Ehrich
patent: 3648800 (1972-03-01), Hoerst
patent: 3665007 (1972-04-01), Hilbig
patent: 3819007 (1974-06-01), Wirt et al.
patent: 3821999 (1974-07-01), Guess et al.
patent: 3964568 (1976-06-01), Neumann
patent: 4231447 (1980-11-01), Chapman
SAE Journal, Aug. 1959, pp. 82-84.

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