| NUCLEAR ENERGY AND NEW ENERGY |
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Flow characteristics of free swirling jet with special structures |
| HU Yu, GONG Yingli, SUN Xinyu, HUANG Xingliang, QI Haiying |
| Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China |
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Abstract Vortex thermal-intensification was studied by measuring the cold flow characteristics of a tornado-like vortex. The experiments measured the effect of the inlet channel area of a vortex generator on the initial vacuum and velocity distribution with strong swirl. The results show that the air mass flow rate strongly influences the initial vacuum with the vacuum increasing with the mass flow rate. All the velocity components of the tornado-like vortex can be described by semi-empirical vortex models with the velocity distribution varying significantly as the swirl intensity decreases. A strong swirl intensity is found crucial to the formation and maintenance of the hollow-core structure. The occurrence of radial entrainment indicates a significant decrease in the swirl intensity. These observations extend the understanding of the tornado-like vortex related to vortex thermal-intensification and provide important reference for exploring these mechanisms in the future.
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| Keywords
vortex thermal-intensification
tornado-like vortex
vortex generator
velocity distribution
vortex model
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Issue Date: 03 March 2020
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2020,
Vol. 60
