Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1982-04-26
1984-10-02
Fuller, Benjamin R.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181213, 60262, F01N 114, F02K 146
Patent
active
044742592
ABSTRACT:
A noise suppressor (24, 76) for a jet engine nozzle (12, 64) is constructed so that the noise suppressor internally ventilates the nozzle jet efflux with ambient air by tubes (26, 78) having ambient inlets (30, 90) upstream of the nozzle discharge end (38, 72). The noise suppressor tubes may be relatively short with respect to the nozzle length but extend downstream of the nozzle so that the gas exhaust jet pumps or aspirates ambient air through the internally ventilating tubes so as to properly mix the air with the gas exhaust to suppress the noise from the jet engine exhaust. The internally ventilating ducts of the noise suppressor extend downstream of the nozzle (38, 40, 72, 84) at least to just beyond a region of high static pressure in the jet and extend in the jet to where a substantial ejected airflow pressure and volume are maintained in the ducts. Where the internally ventilating ducts are arranged concentrically about the axis of the discharged jet, noise is suppressed radially around the nozzle. In other embodiments where the ducts are eccentrically positioned, noise is reduced in a favored or selected direction so as to reduce the total ventilation necessary in comparison with concentric ventilation. In situations where internal ventilation ducts extend into multi-element nozzle tubes or lobes, for example, the internally ventilating ducts may be asymmetrically positioned so as to reduce noise in only a particular direction, such as toward the community below or as to one side of the engine in question.
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Barnard Delbert J.
Fuller Benjamin R.
Heberer Eugene O.
The Boeing Company
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