In this paper is presented a study of a new centrifugal blower where the mass flow variation is controlled by mobile ante rotor and not by speed variation of the electrical motor. A 3-D analysis of the centrifugal blower is involved, where is studied the interaction between rotor, stator and scroll, with a special attention on losses done by each component. Also an optimization of the stator geometry is also done to maximize the efficiency of the blower. It is known that the wall functions

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... t accurately predict the separation and reattachment regions. For this reason, the fine mesh of impeller has the averaged y+ nearly 1, to properly capture the separation flows near leading edge at off-design regimes.