NDLI: Wall Pressure Phase Velocity Measurements in a Turbulent Boundary Layer

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Wall Pressure Phase Velocity Measurements in a Turbulent Boundary Layer

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Teresa, S. Miller Mark, J. Moeller
Abstract	The turbulent boundary layer that forms on the outer surfaces of vehicles can be a significant source of interior noise. In automobiles this is known as wind noise, and at high speeds it dominates the interior noise. For airplanes the turbulent boundary is also a dominant noise source. Because of its importance as a noise source, it is desirable to have a model of the turbulent wall pressure fluctuations for interior noise prediction. One important parameter in building the wall pressure fluctuation model is the convection velocity. In this paper, the phase velocity was determined from the streamwise pressure measurements. The phase velocity was calculated for three separation distances ranging from 0.25 to 1.30 boundary layer thicknesses. These measurements were made for a Mach number range of 0.1 < M < 0.6. The phase velocity was shown to vary with sensor spacing and frequency. The data collapsed well on outer variable normalization. The phase velocities were fit and the group velocity was calculated from the curve fit. The group velocity was consistent with the array measured convection velocities. The group velocity was also estimated by a band limited cross correlation technique that used the Hilbert transform to find the energy delay. This result was consistent with the group velocity inferred from the phase velocities and the array measured convection velocity. From this research, it is suggested that the group velocity found in this study should be used to estimate the convection velocity in wall pressure fluctuation models.
Sponsorship	Noise Control and Acoustics Division
Starting Page	61
Ending Page	69
Page Count	9
File Format	PDF
ISBN	9780791845325
DOI	10.1115/NCAD2012-0195
Volume Number	ASME 2012 Noise Control and Acoustics Division Conference
Conference Proceedings	ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012
Language	English
Publisher Date	2012-08-19
Publisher Place	New York City, New York, USA
Access Restriction	Subscribed
Subject Keyword	Noise (sound) Turbulence Delays Velocity measurement Automobiles Pressure Aircraft Convection Boundary layers Boundary layer turbulence
Content Type	Text
Resource Type	Article

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