Accession Number : AD0431324


Title :   MEASUREMENTS OF NEAR FIELD PRESSURE OF SUBSONIC JETS,


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


Personal Author(s) : Mollo-Christensen,E


Report Date : Apr 1963


Pagination or Media Count : 10


Abstract : A series of measurements are reported of pressure space-time covariance in the near field of several subsonic jets. The data include measured mean flow data, turbulence levels, and x power spectral densities of the pressure field outside the jet. Among the obvious conclusions is the fact that the far field is first established for high frequencies as the distance between jet and detector is increased. A less expected result is the long correlation distances for the larger eddies and the strong correlation across a diameter observed, both in the transitional regime and in the fully turbulent domain. The correlation measurements show a distinction between phase velocity and group velocity of large scale disturbances. (Author)


Descriptors :   SUBSONIC FLOW , VORTICES , STABILITY , TURBULENCE , PRESSURE , OSCILLATION , ANECHOIC CHAMBERS , NOISE , CORRELATION TECHNIQUES , MEASUREMENT , MATHEMATICAL ANALYSIS , JET FLOW


Distribution Statement : APPROVED FOR PUBLIC RELEASE