Abstract
A combined theoretical and experimental study is decribed in which de-swirl nozzles were attached to the outer part of a rotating cavity and angled so that the angular speed of the air at inlet could be in the opposite direction to that of the cavity. Solutions of the momentum-integral equations are used to predict the resulting radial distributions of pressure throughout the cavity. Flow visualization is used to confirm the flow structure, and transducers attached to one of the rotating discs are used to measure the radial pressure distributions. Theoretical values are compared with measurements made inside a rig in which de-swirl nozzles were used to reduce the swirl fraction of the incoming air. It is concluded that there is good agreement between the theoretical and experimental values of pressure distribution. (R.E.P.)