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- W4387616255 abstract "Abstract Rotor internal cooling is a new concept for high power density electric vehicle drives. A turbulent pipe flow is injected into a cylindrical cavity in the rotor shaft of the motor. The flow is deflected in the cavity, accelerated in circumferential direction by the rotor wall and exits through an annular duct with the outer wall rotating. Due to the opposing effects of rotation on turbulence, a complex transitional flow develops. The strong shear layer in the jet region causes high turbulence production. On the other hand, these fluctuations are damped by the centrifugal forces due to the flow rotation. To investigate the influences of the rotation on the turbulence properties and the mean flow, highly resolved large eddy simulations are performed. It is shown that the turbulence production and attenuation due to rotation affect different components of the Reynolds shear stress tensor. This results in highly anisotropic turbulence. In certain areas, where the turbulence attenuation is strongest, the flow even relaminarises. Since the cooling efficiency depends on the turbulent heat transfer of the flow, the local turbulence characteristics are key quantities for the cooling application." @default.
- W4387616255 created "2023-10-14" @default.
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- W4387616255 date "2023-10-13" @default.
- W4387616255 modified "2023-10-15" @default.
- W4387616255 title "Anisotropy and relaminarisation of the turbulent flow near a rotating cylindrical cavity wall" @default.
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- W4387616255 doi "https://doi.org/10.1002/pamm.202300263" @default.
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