Fine scale turbulence measurements in a plane jet

This paper summarizes results for statistics of spatial derivatives of temperature and longitudinal velocity fluctuations in a turbulent plane jet. Relationships between mean square values of either velocity or temperature derivatives violate isotropy. Statistics that reflect the high wavenumber part of the spectrum are consistent with isotropy. The bahavior of autocorrelations of squares of temperature and velocity derivatives and of band-pass filtered temperature and velocity fluctuations indicate that the fine scale temperature field is more intermittent than the fine scale velocity field. The contribution from the large scale motion to the skewness of the streamwise derivative of temperature is assessed using conditional averages associated with the large scale motion.