The design and numerical simulation of a radial inflow turbine for a micromachining spindle is described. The spindle design specifications require the turbine stage to produce approximately 120W of power at a nominal design speed of 100,000 rpm. The aerodynamic and structural performance of the turbine stage is assessed using Computational Fluid Dynamics (CFD) and Finite Element (FE) simulations. A number of options to reduce rotor weight and inertia while maintaining high efficiency are investigated. Finally, as machine tool spindles are typically required to operate over a wide range of torque loads and speeds, the part-load aerodynamic performance of the turbine is also assessed.

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