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Turbulence in the Wake of a Thin Airfoil at Low SpeedsExperiments have been made to determine the nature of turbulence in the wake of a two-dimensional airfoil at low speeds. The experiments were motivated by the need for data which can be used for analysis of the tail-buffeting problem in aircraft design. Turbulent intensity and power spectra of the velocity fluctuations were measured at a Reynolds number of 1.6 x 10(exp 5) for several angles of attack. Total-head measurements were also obtained in an attempt to relate steady and fluctuating wake properties. Mean-square downwash was found to have nearly the same dependence on vertical position in the wake as that shown by total-head loss. For this particular wing, turbulent intensity, integrated across the wake, increased roughly as the 3/2 power of the drag coefficient. Power-spectrum measurements indicated a decrease in frequency as wing angle of attack was increased. The average frequency in the wake was proportional to the ratio of mean wake velocity to wake width.
Document ID
20040034247
Acquisition Source
Headquarters
Document Type
Other - NACA Technical Memorandum
Authors
Campbell, George S. (California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 1957
Subject Category
Aerodynamics
Report/Patent Number
NACA-TM-1427
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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