[en] Experimental and theoretical research undertaken on 2-D axisymmetric geometries under low speed, nonreacting, turbulent, swirling flow conditions is reported. The flow enters the test section and proceeds into a larger chamber (the expansion ratio D/d 2) via a sudden or gradual expansion (sidewall angle alpha 90 and 45 degrees). Inlet swirl vanes are adjustable to a variety of vane angles with values of phi 0, 38, 45, 60 and 70 degrees being emphasized