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| Experiment of Heat Generation Mechanism of GeotechnicalCentrifuge under LowVacuum Degrees |
| Received:September 01, 2019 Revised:October 18, 2019 |
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| DOI：10.7643/issn.1672-9242.2020.03.014 |
| KeyWord:geotechnical centrifuge wind resistance power low vacuum degree heat generation mechanism |
| Author | Institution |
| ZHENG Chuan-xiang |
Zhejiang University, Hangzhou , China |
| CHEN Jian-yang |
Zhejiang University, Hangzhou , China |
| JIANG Jian-qun |
Zhejiang University, Hangzhou , China |
| LIN Wei-an |
Zhejiang University, Hangzhou , China |
| CHEN Yun-min |
Zhejiang University, Hangzhou , China |
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| Abstract: |
| The work aims to provide heat dissipation solution for the large-scale high-speed geotechnical centrifuge of over 1,000 g, so as to ensure its normal operation. The heat generation mechanism of high-speed rotor under low vacuum was studied and the heat dissipation mode was analyzed in combination with experimental research and theoretical analysis. The higher the absolute pressure, the faster the temperature rise in the centrifugal chamber. The input power consumption of centrifuge's driving motor was respectively 2.17, 3.79, 5.17, 7.66 and 11.56 kW under different vacuum (absolute pressure of 10,000, 5,000, 3,000, 2,000 and 1,000 Pa). The heat of super-gravity high-speed geotechnical centrifuge was mainly generated by the first heat source from the friction of air and high-speed rotor, the second heat source from the friction of high-speed rotated air and the centrifugal tank wall, and a small amount of heat from the friction of other mechanism and the friction of air and bottom/top. The wall heat generated by the first heat source can be quickly taken away by arranging a cooling jacket, the heat of the second heat source generated in the center of the centrifugal tank can be cooled by introducing an appropriate amount of cold air, and can also be rapidly evaporated by injecting a coolant and rapidly cooled with latent heat of vaporization. |
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