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 timeresolved temperature measurements were made in the reacting flow using a fast response thermocouple. Velocitytemperature 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.