Abstract
Rotation effects on variable-density co-axial jet mixing in an axisymmetric sudden-expansion geometry are investigated experimentally. A central air jet surrounded by an annular helium/air jet is injected into a circular tube with an enlarged cross-sectional area. Two cases are examined in detail; one stationary and another with a constant speed of rotation of 840 r.p.m. about the tube axis. Results show that mixing between helium and air is greatly enhanced by rotation. Consequently, the recirculation region downstream of the sudden expansion is reduced and the reattachment length is decreased by about a factor of three. However, the flow at 30 step heights downstream of the sudden expansion is essentially identical for both the stationary and rotation cases.
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