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Effect of Inlet Swirl on the Performance of S-Shaped Circular Diffuser

Experimental investigations are carried out to establish the effect of inlet swirl on the performance characteristics of an Sshaped circular diffuser having an area ratio of 1.9, length to inlet diameter ratio (L/D,) of 11.4 and turning angle of 22.5Ύ22.5 with the centerline being formed by joining two equal circular arcs as tangent to each other at the plane of inflexion. Pressure and velocity distribution are measured using a five-hole probe and the turbulence intensity is measured using a constant-temperature hot-wire probe. The performance parameters, evaluated on the basis of mass-averaged quantities, show a significant improvement in the static pressure recovery coefficient for swirl flow, with the improvement being nearly same for both clockwise and anti-clockwise swirl flow. The flow at the exit has reasonable presence of swirl but has no pair of contra rotating vortices.