A thermal-flow coupling calculation of stator-rotor narrow gap 3 D model was carried out by computational fluid dynamics method in the paper. The effects of stator slots,axial cooling flow and rotational speed on the windage loss were taken into account respectively,and the rotor surface heat transfer coefficients were obtained. It shows that the windage loss will increase due to stator slots and axial cooling flow. For the case with an axial cooling flow,the rotor surface heat transfer coefficient is the h...
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