Abstract
An experimental study was made on the effect of a delta-wing row on the promotion and control of turbulent mixing of hot and cold airflows in a T-junction with rectangular cross sections. The wing row was attached on the upstream wall of the branch, and the influence of the angle of attack of the wings on the turbulent mixing was examined in detail by mean temperature measurement, PIV and flow visualization. The thermal mixing is promoted by strong turbulence produced by the delta wings and its promotion can be well controlled with the backward tilting arrangement of the wings. It was found that, in this arrangement, the flow separation at the back of the wings and the reversal of main flow in this separated region played a major role in the promotion of turbulent mixing of two flows.
