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| Effects of Cavity Vacuum Degree on Wind Resistance and Thermal Environment of High-speed Geotechnical Centrifuge |
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| DOI：10.7643/issn.1672-9242.2022.10.016 |
| KeyWord:high-speed centrifuge vacuum degree wind resistance surrounding temperature numerical simulation |
| Author | Institution |
| YAN Jia-ming |
Huadong Engineering Corporation Limited, Hangzhou , China |
| LIN Zhi-yong |
Huadong Engineering Corporation Limited, Hangzhou , China |
| SUN Wen-jing |
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| GAO Qi-hong |
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| ZHANG Jing-zhou |
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| Three-dimensional flow and heat transfer inside the circular cavity wherein centrifuge works were numerically studied with the uses of multi-reference frames (MRF) method, to illustrate the effects of Cavity Vacuum Degree on wind resistance and surrounding temperature of high-speed centrifuge. Under the present research conditions, the results show that with the decrease of vacuum degree, the wind resistance is decreased monotonously. With respect to normal pressure environment, the wind resistance power is decrease more than 90% for vacuum degree of 5 kPa, and 60% for vacuum degree of 30 kPa, respectively. The reduction of vacuum degree leads to the weakening of viscous dissipation and heat generation, but also leads to the weakening of convective heat transfer on the surface of the cavity and the heat transfer ability of the air, which reflects the complex environmental temperature influence mechanism. With respect to normal pressure environment, the maximum temperature in the centrifuge cavity is decreased about 24.7 K for vacuum degree of 5 kPa, and 9.4 K for vacuum degree of 30 kPa, respectively. Under the present research conditions, Decreasing vacuum degree can effectively reduce the ambient temperature, and the temperature drop will be more obvious when vacuum degree is lowered to 10 kPa. |
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