Inflow turbulence control structure

Details Inflow turbulence control structure Inflow turbulence control structure

1979-01-02

1981-03-31

Hix, L. T.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181220, 181222, F02K 1100

Patent

active

042588235

ABSTRACT:
Disclosed is a turbulence control structure for use during static noise testing of jet aircraft engines. A flow transparent substantially spherical geodesic dome defined by a modified 9-frequency icosahedral frame encloses the intake of a jet engine on a test stand. The surface of the dome is covered by flat flow panels constructed of aluminum honeycomb adhesively bonded to stainless steel perforated sheet. The combination of perforated sheet and honeycomb attenuate streamwise and transverse components of inflow distortions in the intake air entering the engine. As a result, clear inflow is achieved, engine speed is stabilized, and engine intake noise approximating that of in-flight operation are achieved.

REFERENCES:
patent: 2807933 (1957-10-01), Martin
patent: 3511337 (1970-05-01), Pease et al.
patent: 3698509 (1972-10-01), Fitting et al.
patent: 4168763 (1979-09-01), White et al.

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