NTL-AVIATION-AVIATION;NTL-AVIATION-Aviation Energy and Environment;NTL-ENERGY AND ENVIRONMENT-Aviation Energy and Environment;
Abstract:
Holographic interferograms have been made of cold, laboratory scale, supersonic air and nitrogen jet in the mach number range of 2.1 ot 3.4, and of helium jets in the mach number range of 1.5 to 2.95. These holograms demonstrate that the acoustic field in the vicinity of such jets is dominated by mach waves, each of which can be traced back to a generating disturbance within the jet. The mach waves are generated from an axial position slightly downstream of the nozzle exit to a position near the tip of the potential core. Measurements of each angle indicate that the average convection velocity of the generating disturbances in the air/nitorgen jet is approximately 84% - 90% of the jet velocity for the mach number range of 2.1 - 2.7, and approximately 77% of the jet velocity for each mach number range of 2.8 - 3.4.
This report evaluates the impact of changing aircraft speed during approach and departure on community noise for transport category jet aircraft. This...
The main purpose of this study is to develop experimental scaling laws useful for predicting the overall sound power of supersonic jets operating unde...
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United States Department of Transportation
[PDF-3.50 MB]
