The aerodynamic noise resulting from the subsonic flow over a flat rigid plate at zero incidence has three origins. “Surface” noise due to fluctuating surface pressure is postulated to vanish by the author's image argument, except near the edges of the plate, where it is more appropriately called edge noise. Of dipole nature, its acoustic power depends on the velocity raised to between the fourth and fifth power, and consequently is to be expected to be of prime importance at low enough speeds. The contribution from fluctuating shear stresses is likely to be much smaller and so has been neglected. Quadrupole radiation takes place from from the turbulence of the boundary layer, producing layer noise and also from the turbulent wake, producing wake noise. Together, the latter two are suggested to have a spectrum with a single peak, bounded by slopes like f2 and f−7/4. Their noise power depends on nearly the eighth power of velocity, so is of increasing importance with speed. Analytical details rest on similarity concepts; the spectra in particular are subject to certain conditions. Also, the convection effects on the acoustical power and spectra are excluded on empirical grounds stemming from considerations of jet noise.
Skip Nav Destination
Article navigation
December 1959
December 01 1959
On the Aerodynamic Noise of a Rigid Flat Plate Moving at Zero Incidence
Alan Powell
Alan Powell
Department of Engineering, University of California, Los Angeles 24, California
Search for other works by this author on:
Alan Powell
Department of Engineering, University of California, Los Angeles 24, California
J. Acoust. Soc. Am. 31, 1649–1653 (1959)
Article history
Received:
September 01 1959
Citation
Alan Powell; On the Aerodynamic Noise of a Rigid Flat Plate Moving at Zero Incidence. J. Acoust. Soc. Am. 1 December 1959; 31 (12): 1649–1653. https://doi.org/10.1121/1.1907674
Download citation file:
Pay-Per-View Access
$40.00
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Citing articles via
Focality of sound source placement by higher (ninth) order ambisonics and perceptual effects of spectral reproduction errors
Nima Zargarnezhad, Bruno Mesquita, et al.
Related Content
Experimental determination of probe‐length requirements for studies of the turbulent wake behind a cylinder
Rev. Sci. Instrum. (May 1979)
Line and plane arrays of resonant monopole scatterers
J. Acoust. Soc. Am. (March 1990)
Detection of Signals in Noise: A Comparison between the Human Detector and an Electronic Detector
J. Acoust. Soc. Am. (July 1956)
American Standard Method for the Coupler Calibration of Earphones Z24.9—1949 (Abridged)
J. Acoust. Soc. Am. (September 1950)
Subharmonics in Forced Oscillations in Dissipative Systems. Part II
J. Acoust. Soc. Am. (July 1935)