DETERMINATION OF DERIVATIVE MOMENTS USING 2 SLANTED HOT-WIRES AND A SPECTRAL METHOD

A method to determine derivative moments using slanted hot-wires and a spectral method has been developed. The general idea is to minimize t he measuring volume by using only two hot-wires, and a post-processing of the measurement data. It is shown that the spectral method is equi valent to conventional determination of correlations. The method devel oped has been tested in the self-preserving region of a plane wake by computing profiles of the Reynolds stresses as well as the derivative moments in the expression for the total energy dissipation. One term i n this expression, which with conventional methods requires two triple -wires or four cross-wires, has been determined using the spectral met hod.