MACROSCOPIC EULERIAN DERIVATIVE OF A VOLUME INTEGRAL ENTROPY OF A TURBULENT GAS SOME SPECTRAL MEASUREMENTS OF SPACE-TIME CORRELATIONS

摘要

I. Continuation of development of the statistical equations of a com¬pressible turbulent gas: macroscopic derivative of a volume integral, i.e. following the macroscopic movement. Application to entropy. Statistical equation of entropy.nII. Hew measurements of space-time correlations spectra for velocities in a turbulent boundary layer, with longitudinal and transversal displacement. The maximum maximorum correlation ,1s decreasing when the frequency is in¬creasing, but 1st location is not much affected by the frequency.