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Aeroacoustics of a High Aspect-Ratio JetCirculation control wings are a type of pneumatic high-lift device that have been extensively researched as to their aerodynamic benefits. However, there has been little research into the possible airframe noise reduction benefits of a circulation control wing. The key element of noise is the jet noise associated with the jet sheet emitted from the blowing slot. This jet sheet is essentially a high aspect-ratio rectangular jet. Thus, to fully understand the noise of a circulation control wing, the noise of high aspect-ratio rectangular jets must also be understood. A high aspect-ratio nozzle was fabricated to study the general characteristics of high aspect-ratio jets with aspect ratios from 100 to 3000. The jet noise of this nozzle was proportional to the 8" power of the jet velocity. It was also found that the jet noise was proportional to the slot height to the 312 power and slot width to the 1/2 power.
Document ID
Acquisition Source
Langley Research Center
Document Type
Munro, Scott E.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Ahuja, K. K.
(Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
August 21, 2013
Publication Date
May 31, 2003
Publication Information
Publication: Application of Circulation Control Technology to Airframe Noise Reduction
Subject Category
Funding Number(s)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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