Turbulent velocity field structure in a round jet and its relation to fluctuating pressure fields

An experimental examination of the turbulent velocity field structure in a 2.5 inch cold jet was performed. Primary emphasis was given to the description of the structure within the driven shear layer to five diameters downstream. Both single point and two point correlation measurements were made with a special emphasis on the modeling of the two point covariance function with axisymmetric tensor forms. A higher order stochastic analysis of the velocity field was performed using an extended version of the single variate Gram-Charlier expansion of the probability density function. A qualitative examination of the stochastic structure of the velocity field was performed using the Wiener-Hermite expansion theory for turbulence in an extended version to include the effect of mean velocity gradients. Results were to be used in the prediction of fluctuating pressure fields, as in the problem of aerodynamic noise generation, or in the more general shear flow dynamic equations.