A micro-scale, high-speed compressor impeller (12mm diameter, 800,000 rpm) was tested for feasibility in regard to aerodynamic performance. The compressor was designed for application in a fist-sized gas-turbine-generator. To survive high stresses at such high temperatures, the rotor was manufactured as a single turbine/compressor/shaft unit in silicon nitride, by the Mold SDM process. Performance testing was conducted in a cold-flow rig at reduced speed of 420,000 rpm. Results from a CFD code compared favorably to measured data at this speed. Extrapolation from test conditions to full design speed was accomplished by application of CFD applied at both speeds.
Micro-Scale Radial-Flow Compressor Impeller Made of Silicon Nitride: Manufacturing and Performance
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Kang, S, Johnston, JP, Arima, T, Matsunaga, M, Tsuru, H, & Prinz, FB. "Micro-Scale Radial-Flow Compressor Impeller Made of Silicon Nitride: Manufacturing and Performance." Proceedings of the ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. Volume 3: Turbo Expo 2003. Atlanta, Georgia, USA. June 16–19, 2003. pp. 779-788. ASME. https://doi.org/10.1115/GT2003-38933
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