Abstract
Abstract High-speed electric drives and compact turbo compressors allow to increase efficiency and decrease size of gas supply systems. A new high-speed drive platform using highly loaded electrical components and passive gas bearings is introduced. Aiming at a large variety of gas supply applications (e.g. general air supply, fuel cell gas supply, refrigeration), the required mass flow, pressure ratio and power also greatly varies. To cover all applications, the full design space of axial, mixed, and radial flow compressors is relevant. In this paper, general design considerations for electrically powered, compact compressors are presented along with exemplary compressor designs. These designs are investigated with computational fluid dynamics (CFD) as well as experimental tests. Using test data, it is shown that the numerical predictions in terms of compressor performance agree well with the experimental results. The test data confirm that gas supply system efficiencies above 55% are possible with compact turbo compressors.
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