EXPERIMENTAL STUDY OF THE MEAN FLOW CHARACTERISTICS OF SWIRLING JET

In the present investigation, the axial mean flow characteristics of a swirling jet are compared with that of a plane circular jet. The
swirling effect is imparted by installing a twisted plate at the nozzle exit as swirl generator. The effect of swirl on the velocity profiles and spread rates of both the jets are studied. It is found that the influence of swirl is significant in the near flow field where it shifts the velocity maxima away from the jet centreline forming an annular potential core. The swirl increases the jet spread rate resulting its earlier diffusion than the plane circular jet. This phenomenon is found by observing the decay of centreline velocity of both the jets.