The annular gap between rotor and stator is an inevitable flow path of a throughflow ventilated electrical machine,but the flow entering the rotor-stator gap is subjected to the effects of rotation.The pressure loss a...The annular gap between rotor and stator is an inevitable flow path of a throughflow ventilated electrical machine,but the flow entering the rotor-stator gap is subjected to the effects of rotation.The pressure loss and volumetric flow rate across the rotor-stator gap were measured and compared between rotating and stationary conditions.The experimental measurements found that the flow entering the rotor-stator gap is affected by an additional pressure loss.In the present study,the rotational pressure loss at the entrance of rotor-stator gap is characterised.Based upon dimensional analysis,the coefficient of entrance loss can be correlated with a dimensionless parameter,i.e.rotation ratio.The investigation leads to an original correlation for the entrance loss coefficient of rotor-stator gap arisen from the Coriolis and centrifugal effects in rotating reference frame.展开更多
文摘The annular gap between rotor and stator is an inevitable flow path of a throughflow ventilated electrical machine,but the flow entering the rotor-stator gap is subjected to the effects of rotation.The pressure loss and volumetric flow rate across the rotor-stator gap were measured and compared between rotating and stationary conditions.The experimental measurements found that the flow entering the rotor-stator gap is affected by an additional pressure loss.In the present study,the rotational pressure loss at the entrance of rotor-stator gap is characterised.Based upon dimensional analysis,the coefficient of entrance loss can be correlated with a dimensionless parameter,i.e.rotation ratio.The investigation leads to an original correlation for the entrance loss coefficient of rotor-stator gap arisen from the Coriolis and centrifugal effects in rotating reference frame.
