Accession Number:

AD0832715

Title:

PREDICTION OF BOUNDARY LAYER PRESSURE FLUCTUATIONS

Descriptive Note:

Research staff rept. Jan-Oct 1967

Corporate Author:

WYLE LABS INC HUNTSVILLE AL TESTING DIV

Personal Author(s):

• Lowson, Martin V.

Report Date:

1968-04-01

Pagination or Media Count:

41.0

Abstract:

The pressure fluctuations beneath equilibrium boundary layers at subsonic and supersonic speeds are reviewed. Empirical formulae are presented for the intensity, spectra, and cross spectra of the fluctuations. The formulae are intended for direct use in structural response calculations. A simple theoretical model to predict intensities at supersonic speeds is put forward, and the effects of nonequilibrium boundary layers are discussed in general terms. An appendix gives theoretical justification for negative exponential correlation curves at large spacings. Author

Descriptors:

• *TURBULENT BOUNDARY LAYER
• MATHEMATICAL MODELS
• MATHEMATICAL PREDICTION
• PRESSURE
• SUBSONIC CHARACTERISTICS
• NONEQUILIBRIUM FLOW
• MACH NUMBER
• STATISTICAL PROCESSES
• SUPERSONIC CHARACTERISTICS
• SONIC FATIGUE
• AIRCRAFT NOISE
• EQUILIBRIUM(PHYSIOLOGY)

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE