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This paper will present the results of the experimental investigation of heat  transfer in a non-annular channel between rotor and stator similar to a real  generator. Numerous experiments and numerical studies have examined flow and  heat transfer characteristics of a fluid in an annulus with a rotating inner  cylinder. In the current study, turbulent flow region and heat transfer  characteristics have been studied in the air gap between the rotor and  stator of a generator. The test rig has been built in a way which shows a  very good agreement with the geometry of a real generator. The boundary  condition supplies a non-homogenous heat flux through the passing air  channel. The experimental devices and data acquisition method are carefully  described in the paper. Surface-mounted thermocouples are located on the  both stator and rotor surfaces and one slip ring transfers the collected  temperature from rotor to the instrument display. The rotational speed of  rotor is fixed at three under: 300rpm, 900 rpm and 1500 rpm. Based on these  speeds and hydraulic diameter of the air gap, the Reynolds number has been  considered in the range: 4000<Rez<30000. Heat transfer and pressure drop  coefficients are deduced from the obtained data based on a theoretical  investigation and are expressed as a formula containing effective Reynolds  number. To confirm the results, a comparison is presented with Gazley’s  (1985) data report. The presented method and established correlations can be  applied to other electric machines having similar heat flow characteristics

Heat transfer and flow region characteristics study in a non-annular channel between rotor and stator