On the analysis of temperature dissipation in a turbulent jet propane flame

The analysis of a turbulent jet flame of propane in still air is reported with the aim of contributing to a better understanding of the interaction between chemistry and the turbulent structure of the flow in non-premixed combustion systems. The emphasis is put on time-resolved two-point temperature measurements, from which the dissipation of the temperature fluctuations was obtained. The results quantify the correlation of thermal dissipation with the fluctuations of the temperature, which suggest the likely influence of large scales mixing on the anisotropy of the thermal dissipation rate. In addition, the experiments reported here demonstrate the ability of compensated fine wire thermocouples to measure the dissipation rate of temperature in strongly radiating flames, where the use of optical techniques may be limited. (C) 1998 Published by Elsevier Science Inc. All rights reserved.