Flanged Diffuser is a collecting-accelerating device that shrouds a turbine. Forgiven rotary engine diameter, the power augmentation may be achieved by a brimmed diffuser, popularly known as wind lens. the current numerical investigation deals with the result of the low region created by wind lens to analyze the sturdy vortices shaped by brim connected to the shrouded diffuser at the exit. additionally, during this analysis, a comparative numerical prediction of mass flow rates the turbine has been allotted with numerous sorts of wind lens that successively helps to optimize the torque augmentation. it's been well-tried that there's an important increase within the vortex strength & wake formation once the brimfull effect is added to a diffuser.