Abstract
Single-point and two-point fluctuating static pressure measurements have been made in the initial mixing and transition regions in a co-annular circular jet. Space scales, correlation and time scales in the convected frame, and convection velocities have been determined for both broad-band and narrow-band frequency components. Analytical functionals describing the structural behavior of the turbulent pressure field have been developed from the data which are suitable for direct application in predicting the sound power level radiated from this turbulent field. Effects of both area and velocity ratios are incorporated in the model. A b BB dc,dEp x> y Nomenclature = anisotropy factor = mixing layer width = broad band = diameter of core or of bypass nozzle = decay coefficients in axial, radial, and lateral directions, respectively = broad-band axial length scale for pressure = narrow-band radial and lateral
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