Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1976-04-21
1978-09-12
Tomsky, Stephen J.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
98 43R, 181222, 181259, 181262, 417198, G10K 1104, F01N 104, F01N 304, F04F 544
Patent
active
041130480
ABSTRACT:
A method of and a device for attenuating the noise radiated by a free-expion gas jet throughout the audible-frequency range as well as in the ultrasonic and infrasonic frequency ranges. Concomitantly with the complete and shock-free expansion of the gas into the atmosphere, the acoustic field of the jet is organized by the substantial diminution of the low-frequency tones by causing them to pass from the annular section of the jet to the narrow annular section of the nozzle slot. This is followed by sound-wave diffraction on emergence from the slot in the presence of a baffle, and by a wave reflection towards the sound-absorption lining of the device housing. The final noise results from an intensive ejection of ambient air by the primary gas which, leving the nozzle slot, entrains the air by means of turbulence, the air entering through the annular channels of the case, reaching the outer orifices of the nozzle, and dividing into two flows, namely inside and outside the nozzle.
REFERENCES:
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patent: 2293632 (1942-08-01), Sauer
patent: 2831548 (1958-04-01), Barkelew
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patent: 3794137 (1974-02-01), Teodorescu et al.
patent: 3815487 (1974-06-01), Teodorescu et al.
patent: 3899923 (1975-08-01), Teller
Institutul National Pentru Creatie Stiintifica Si Tehnica - Incr
Ross Karl F.
Tomsky Stephen J.
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