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  • 1980-1984  (1)
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    Design predictions for noise control in the cryogenic National Transonic Facility (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Noise control in the National Transonic Facility - a cryogenic wind tunnel - has been examined in terms of acoustical design criteria, drive-fan noise and exhaust system noise. A duct lining with two layers of perforated sheeting and a gas-filled honeycomb core was selected for attenuating drive-fan noise. With the exception of attenuation peaks, attenuation of the lining was found to experimentally agree with predicted values at 20 C air temperatures. Exhaust system noise will be attenuated with a large muffler used in conjunction with a 6.1-m high acoustical enclosure. Fan noise from the fan-ejector system will be attenuated by fan silencers and the acoustic enclosure.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: Noise Control Engineering; 17; Sept
    Format: text
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