Fluctuations de temperature dans un ecoulement turbulent a temperature elevee

The thermal fields are generally studied for only weakly heated turbulent flows.Presented here are thermal field measurements executed in a grid created turbulent air flow. heated to 400°C. The flow is established in a circular section cylindrical tube. The reference dynamic field is characterized by Re = 20. The obtained results indicate that the small eddies' dissipation increases with the mean temperature. The thermal field seems to be more and more structured by big eddies; it is observed that the dimensions of the most energetic eddies and the dissipation micro-scales of the thermal field are growing with the flow mean temperature.