Behaviours of supersonic oxygen jet with various Laval nozzle structures in steelmaking process |
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| Authors: | Kai Dong Rong Zhu Fuhai Liu |
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| Affiliation: | 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, People’s Republic of China;2. Beijing Key Laboratory of Research Center of Special Melting and Preparation of High-end Metal Materials, University of Science and Technology Beijing, Beijing, People’s Republic of China;3. Beijing Key Laboratory of Research Center of Special Melting and Preparation of High-end Metal Materials, University of Science and Technology Beijing, Beijing, People’s Republic of China;4. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, People’s Republic of China |
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| Abstract: | The top-blowing supersonic oxygen jet is now used widely in steelmaking and metal refining processes. However, the ambient temperature and oxygen flow rate is changed during top-blowing process, making the flow field of supersonic oxygen jet unstable. Hence, it is very important to research the behaviour of supersonic oxygen jet in high ambient temperature. In the present study, the supersonic coherent jet flow fields with 2 kinds of Laval nozzle structures were analysed at various ambient temperature conditions. The total temperature and axial velocity were measured by experiment to verify simulation results. Based on the results, the design method of characteristic-line equation could be more effective in the control the velocity vector of oxygen jet, compared with the one-dimension isoentropic flow theory. As a result, the Laval nozzle designed by characteristic-line equation could suppress the forming of shock wave, reduce the radial velocity and increase the stirring ability of oxygen jet under various ambient conditions. |
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| Keywords: | Laval nozzle supersonic jet numerical simulation steelmaking |
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