Methods and apparatus for suppressing engine test cell howl

Details Methods and apparatus for suppressing engine test cell howl Methods and apparatus for suppressing engine test cell howl

1999-06-29

2000-07-25

Ro, Bentsu

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181217, 181220, 181221, 23926511, 23926513, 23926515, 23926517, B64F 126

Patent

active

06092621&

ABSTRACT:
Methods and apparatus for suppressing cell howl with negligible impact on engine test conditions are described. The apparatus, in an exemplary embodiment includes a flow distorter configured to be positioned close to a nozzle exit of an engine nozzle, and a flow distorter support for maintaining the flow distorter at a selected location. The flow distorter is adjustably secured to the support so that a distance at which a tip of the distorter is located relative to support is adjustable.

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patent: 3613996 (1971-10-01), Tanner
patent: 3899923 (1975-08-01), Teller
patent: 4168763 (1979-09-01), White et al.
Jones et al., The Acoustic Response Of Altitude Test Facility Exhaust Systems To Axisymmetric And Two-Dimensional Turbine Engine Exhaust Plumes, DGLR/AIAA 92-02-131, May, 1992.
Seiner et al., Experiments Of Shock Associated Noise On Supersonic Jets, AIAA 79-1526, Jul., 1979

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