Velocity and concentration characteristics and their cross correlations for coaxial jets in a confined sudden expansion. I - Experiments

An experimental method was developed to measure the mean and fluctuating velocity and concentration distribution and their cross correlations for a variety of flow applications including recirculating flows. The experimental technique uses a laser Doppler velocimeter to measure velocities, a laser-induced fluorescence technique to measure the concentration of a fluorescent trace material in one stream, and a minicomputer-based data handling system. The data obtained by this technique can be used to evaluate the turbulent transport models currently used in computational procedures by comparing the calculated parameters directly with the experimentally measured values.