Numerical analyses study is reported on the flow characteristics in a conical diffuser with a helical tape insert. In this study, a rectangular tape of 5 mm width and 2 mm thickness is used inside the inner wall of the diffuser to induce additional recirculation. The numerical results are achieved for different Reynolds numbers (58035, 116072, 174108 and 232144) based on the inlet hydraulic diameter. The simulations are carried out with constant inlet condition considering the flow turbulent and incompressible. Air is used as a working fluid and maintained at constant room temperature. From a similar inlet condition, the results indicated that the velocity distribution is well enhanced.