Effect of Merging Angle on Turbulent Mixing Layers

Experimental investigations have been conducted on the two types of mixing layer's produced from two streams merging at 0 and 20. each type of mixing lauers was produced with velocity ratios of 0.7, 0.8 and 0.9, and mecsuremen is wt'if done at six streamwise locations . the boundary layers were untripped and the initial boundary layers were turbulent in all the cases. the results show that the splitter wake play a dominant role in the development of the mixing layers. both types of mixing lau ers attain ed se lj-similatity fo r ve loci ty ratiosof 0. 7 an d 0.8. but failed f or 0.9 within the measurement domain. with the increasing velocity ratio. development distance was increased and growth. was decreased for both types of mixing layers, but the mixing lasjers with non-zero merging angles have higher growth than the zero angle one for the same velocity ratio , both types of mixing layers were f ound to spread more and more into the high speed region with the increasing velocity ratio.