Accession Number : AD0436680

Title :   RECENT FREE-FLIGHT BOUNDARY-SURFACE AERODYNAMIC NOISE MEASUREMENTS,

Corporate Author : ADVISORY GROUP FOR AERONAUTICAL RESEARCH AND DEVELOPMENT PARIS (FRANCE)

Personal Author(s) : Garrick, I. E. ; Hilton, D. A. ; Hubbard, H. H.

Report Date : APR 1963

Pagination or Media Count : 40

Abstract : Recent measurements of fluctuating pressures due to airflow over surfaces are reviewed. Included are data from aircraft, missiles, and space vehicles for wide ranges of dynamic pressure and Reynolds number for both subsonic and supersonic speeds. Several sources of turbulence that result in severe vehicle loads and vibration environments are discussed, including results for surface flow conditions of developed boundary-layer turbulent flows and others for buffeting types of flow. Also included is brief mention of recent information on the large-scale turbulence characteristics of the atmosphere. Correlations based on free-stream dynamic pressure are presented for a variety of flow conditions, including flow separation and possible shock-wave interactions. These results indicate a relatively weak dependence of the surface pressure coefficient on Mach number, but the coefficient may vary markedly depending on the local flow conditions. (Author)

Descriptors :   (*AIRCRAFT NOISE, AIRFRAMES), (*AERODYNAMIC LOADING, VIBRATION), AIRCRAFT, GUIDED MISSILES, SPACECRAFT, BUFFETING, SUBSONIC CHARACTERISTICS, SUPERSONIC CHARACTERISTICS, SOUNDING ROCKETS, TURBULENT BOUNDARY LAYER, PRESSURE, AERODYNAMIC CHARACTERISTICS, NOISE.

Distribution Statement : APPROVED FOR PUBLIC RELEASE