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Fabrication and Test Results of Cryogenic Blower with Metal 3D Printing Impeller
Y. Kwon(권용현),J. Lee(이재환),K. Kim(김기환),J. Kim(김준일),S. Kim(김석호) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
The demand for cryogenic blowers is increasing as the cooling system using superconducting applications and liquefied hydrogen increases. Cryogenic blowers are used to circulate cooling fluids in the temperature range of 20 to 40 K. Currently, most of the impellers of cryogenic blowers are made through machining, and there are restrictions on their manufacturing shape. If the conventional impeller manufacturing method using machining is replaced with 3D printing, processing cost reduction and variety of shapes can be expected. In this paper, the impeller, a core component of the cryogenic blower, was manufactured with a metal 3D printer to conduct design and performance evaluation. The operating condition of the cryogenic blower was designed at 5 bar, 20 K in gas helium. The output of the cryogenic blower is designed to have a maximum flow output of 12 g/s at 18,000 RPM and a head output of 58 m. The designed cryogenic blower was verified through CFD analysis, and performance test was performed with an impeller manufactured by machining. The impeller manufactured by 3D printing was replaced by the same blower and compared with the performance test results of the machining impeller.