Accession Number:

AD0712406

Title:

JET NOISE SUPPRESSION BY AN IMPEDANCE SHROUD,

Descriptive Note:

Corporate Author:

BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH

Personal Author(s):

Report Date:

1970-06-01

Pagination or Media Count:

26.0

Abstract:

Jet noise can be attenuated by shielding the observer from the noise sources with a sheet of fluid having a different acoustic impedance to the undisturbed atmosphere. The attenuation due to a heated sheet of gas lying on an arc centered on the axis of a subsonic jet was measured. The maximum noise reduction in certain frequency bands in this experiment was 10 dB. Author

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE