Experimental study on temperature control of scaled model of ultra-large geotechnical centrifuge based on helium replacement
A temperature control method was proposed using helium to replace the air in the machine room,and a heat transfer model for distinguishing different heat sources was established to address the temperature control issue of the centrifugal hypergravity and interdisciplinary experiment facility(CHIEF)under normal pressure.By reducing the windage power,the heat generation was reduced from the source.A scaled model experiment facility of the CHIEF was constructed(the diameter reduction ratio of the machine room is 1∶20),the windage power and the machine room temperature under air or helium medium were measured respectively.Experimental results showed that with the helium replacement of air,the windage power dropped by 82.4%,and the highest temperature in the machine room decreased from 56.4℃to 32.9℃,while the maximum temperature difference decreased from 6.8℃to 4.1℃.Analysis results of the heat transfer model indicated that the friction between the air and the sidewall was the chief cause of the temperature rise in the machine room,and the temperature of the machine room was controlled at 25.7℃in the case of helium replacement,achieving the temperature control target of the maximum temperature in the machine room not exceeding(40±5)℃.
centrifugal hypergravity and interdisciplinary experiment facility(CHIEF)geotechnical centri-fugetemperature controlwindage powerhelium replacement
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维普
