Temperature and related statistics in turbulent jet flames

This paper describes the use of digitally-compensated thermocouples to characterise the time-resolved behaviour of the temperature field in turbulent non-premixed jet flames for Re?2×10⁴, including the transport of heat and the related temperature dissipation. The experimental procedures used are analysed, including the thermocouple time constant determination and the numerical derivative compensation method, and assessments of accuracy are provided for the cross-correlation techniques used in order to estimate high-order temperature statistics in the flames studied. The results quantify the influence of the spatial resolution of the measuring systems on the accuracy of correlation values, regarding the characteristics scales of the flames studied, and demonstrate the applicability of fine-wire thermocouples to characterise the turbulent transport and the dissipation of temperature in non-premixed jet flames.