Investigation on superposed flow field in rotating disk system with forced through flow

An important flow phenomenon that a rotator-stator system with large forced through flow could be considered as the flow composition of a rotor-stator system without through flow and a two stator system with large forced through flow is observed according to the experimental investigation applying Particle Image Velocimetry (PIV) to measure turbulent flows in the gap between a rotating and a stationary disk with different Reynilds number Re_Ω, flow coefficient C_w and gap ratio G when the direction of through flow in the gap are both inward and outward. In this paper, numerical investigation for this flow phenomenon is performed. The computational results agree well with the experimental. The distribution formula of velocity in each layer in the gap in the rotating disk system is put forward; it is very useful to guide the design of impeller machine.