Abstract
The time-averaged flows in a 14 deg conical diffuser with and without vortex generator jets (VGJs) have been studied numerically by solving the RANS equations with the κ-ε turbulence model. The diffuser performance was investigated associated with the velocity ratio (ratio of the jet speed to the mainstream velocity). The results indicated that the Cp-VR curve is reasonably simulated. However, the separation point in the diffuser without VGJs was not predicted satisfactorily. Further, attempts have been made to correlate the pressure recovery and longitudinal vortices in the diffuser.
