Abstract
An experimental study was made on the promotion and control of turbulent mixing of hot and cold airflows in a T-junction with rectangular cross sections. A delta-wing row was attached on the bottom wall of the main channel before the flow merging to promote and control the turbulent thermal mixing. The mean temperature and velocity distributions were measured in several cross sections after the flow merging by thermocouples and PIV, respectively. The development of the thermal mixing layer could be promoted effectively by the delta wings and the thermal mixing could be controlled by changing the angle of attack of wings. Longitudinal vortices produced by the delta wings disappeared just after the merging of two flows. High turbulence generated by the interaction of those vortices and branch flow was, however, maintained to further downstream cross sections and contributed to the promotion of the thermal mixing.
