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COMBINED LOA-CARS MEASUREMENTS OF VELOCITY-TEMPERATURE CORRELATIONS IN TURBULENT FLAMES

Mark J. Tummers
Section of Transport Phenomena, Department of Chemical Engineering, Faculty of Applied Sciences Delft University of Technology and J. M. Burgerscentre for Fluid Dynamics Julianalaan, 2628 BL Delft

E. H. van Veen
Delft University of Technology Faculty of Applied Sciences Section Thermal and Fluids Sciences P.O. Box 5046,2600 GA Delft, The Netherlands

N. George
Delft University of Technology Faculty of Applied Sciences Section Thermal and Fluids Sciences P.O. Box 5046,2600 GA Delft, The Netherlands

R. Rodink
Delft University of Technology Faculty of Applied Sciences Section Thermal and Fluids Sciences P.O. Box 5046,2600 GA Delft, The Netherlands

Kemal Hanjalic
Department of Physics, Novosibirsk State University (NSU), 1, Pirogov Str., Novosibirsk, 630090, Russia; Faculty of Applied Sciences, Delft University of Technology (TU Delft), Building 58, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands

Résumé

Simultaneous measurements of velocity and temperature were conducted in a turbulent jet diffusion flame. Temperatures were measured by using Coherent Anti-Stokes Raman Spectroscopy (CARS) whereas Laser Doppler Anemometry (LDA) was used for the velocity measurements. The temperature and velocity samples were processed to form (time-dependent) velocity-temperature correlation functions. The measured correlation functions indicated that the gradient-diffusion hypothesis is reasonably accurate for the radial direction. However, for the axial direction the gradient diffusion hypothesis is accurate only in the central region of the flame while counter-gradient diffusion is found in the outer region.