Sound shield

Details Sound shield Sound shield

1981-05-28

1982-12-14

Swisher, S. Clement

Measuring and testing

Wind tunnel: aerodynamic wing and propeller study

G01M 900

Patent

active

043632378

ABSTRACT:
An improved test section 16 for a supersonic or hypersonic wind tunnel 10 is disclosed wherein the model tested is shielded from the noise normally radiated by the turbulent tunnel wall boundary layer. A vacuum plenum 23 surrounds spaced rod elements 28 making up test chamber 16 to extract some of the boundary layer as formed along the rod elements during a test to thereby delay the tendency of the rod boundary layers to become turbulent. Novel rod construction involves bending each rod slightly prior to machining the bent area to provide a flat segment 29 on each rod for connection with the flat entrance fairing 31. Rods 28 and fairing 31 are secured to provide a test chamber incline on the order of 1.degree. outward from the noise shield centerline to produce up to a 65% reduction of the root-mean-square (rms) pressure over previously employed wind tunnel test sections at equivalent Reynolds numbers.

REFERENCES:
patent: 3027760 (1962-04-01), Holderer
patent: 3602920 (1971-09-01), Davis
patent: 3853003 (1974-12-01), Sorensen
patent: 3952590 (1976-04-01), Howard

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