Fluctuating velocity-pressure field structure in a round jet turbulent mixing region

An experimental study of turbulent mixing was conducted to provide detailed insight regarding the turbulent transport processes, especially those involving pressure. The investigation was conducted in the mixing region of a 6.35 cm diameter, isothermal, stationary jet having an exit velocity of 91.4 m/s. The study involved the following related parts: (1) measurements of single-point pressure-velocity correlations and estimation of the error involved in these correlations due to the velocity contamination of the pressure probe; (2) measurements of the three velocity components simultaneously, in order to obtain higher order velocity correlations and to verify the similarity of these correlations so that similarity assumptions can be used in the turbulent kinetic energy balance and in turbulent modeling work; (3) estimation of two dimensional velocity vector patterns representing the large-scale coherent structures from the pressure-velocity correlation measurements using the linear estimation theory; (4) review and experimental verification of velocity and pressure spectra modeling theory based on dimensional analysis and extension of this study to include cross spectra of shear stress and pressure-velocity correlations; and (5) verification of the turbulent kinetic energy balance.