CFD Analysis of Forced Air Cooling of a High-Speed Electric Motor

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This paper presents the results of using STAR-CCM+® to simulate the conjugate heat transfer of Forced Air Cooling of a High-Speed Electric Motor.  The CFD modeling uses k-omega SST turbulence model  in order to solve the compressible unsteady conservation equations for the air flow through the small annular gap which is fed at 0.01 kg/sec while the rotor spins at 100,000 rpm and dissipates 200 W. The major objective of this CFD analysis was to ascertain the drag force acting on the rotor. The time traces of the unsteady flow indicate that there is a periodic forcing of the drag force which is comprised of three fundamental harmonic modes. This drag force was post-processed as a drag coefficient and compared to available test data. The flow field developed in the annular gap corresponds to Taylor-Couette flow with crossflow. The large Reynolds number, Taylor number flows considered correspond to the turbulent+vortices region of Taylor-Couette Flow. The heat transfer coefficient obtained from the CFD simulations is compared to available correlations in the literature.

Author Company: 
California State Polytechnic University at Pomona
Author Name: 
Kevin Anderson