SIMULTANEOUS VELOCITY AND TEMPERATURE-MEASUREMENTS IN A PREMIXED DUMP COMBUSTOR

Experimental measurements of velocity and temperature were made in a low-speed turbulent flowfield following an axisymmetric sudden expansion with and without combustion. The combustion case considered here used a lean, completely premixed propane-air mixture whose flame was stabilized by the recirculation zone present in this flow. Simultaneous two-component laser velocimeter measurements were made giving the mean axial and radial velocities and the Reynolds stresses throughout the flowfield. In addition, simultaneous time-resolved temperature measurements were made in the reacting flow using a fast response thermocouple. Velocity-temperature correlations were formed from the velocity and temperature measurements. The reacting flow case was found to have a shorter and stronger recirculation zone, and the turbulence intensity level was found to be suppressed over most of the flowfield when compared with the cold flow case.