Abstract
The special burner structure of oxy-fuel heating furnace can realize the dispersive combustion effect, so as to achieve the uniform combustion temperature and realize the industrial heating application. Studies have shown that the essence of diffuse combustion is a new mixed combustion phenomenon formed by the return of flue gas to entrain fuel and combustion aid, a large number of turbulent vortex structures exist in the process of mixed flow, the effect of diffuse combustion is determined by the characteristics of the vortex structure. In this paper, by numerically simulating the experiment of oxygen dispersion heating furnace, analyzing the influence of vortex structure characteristics in the furnace on the mixing, it is found that the reflux mixing process of oxygen dispersion combustion is mainly concentrated from the nozzle outlet to the three molecules in the furnace. Therefore, this paper focuses on the Q criterion and the Liutex vortex identification method to analyze the formation characteristics of the vortex structure in the front half of the furnace and the relationship with the diffuse combustion, and verify it with the Ω method. The results show that the Q criterion is basically the same as the Liutex method in identifying large eddies, but the small eddies are not recognized by the Q criterion. Therefore, the Liutex method is more accurate in identifying the vortex structure.
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Acknowledgments
This study was financially supported by National Natural Science Foundation of China (Grant Nos. 51964039, 51464041, 51164025) and National Natural Science Foundation of Inner Mongolia (Grant No. 2018MS05009).
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Guo, C., Wu, Y., Liu, Z., Zhang, D. (2021). Eddy Current Research of Oxy-Fuel Heating Furnace Based on Third Generation Vortex Recognition Method. In: Liu, C., Wang, Y. (eds) Liutex and Third Generation of Vortex Definition and Identification. Springer, Cham. https://doi.org/10.1007/978-3-030-70217-5_29
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DOI: https://doi.org/10.1007/978-3-030-70217-5_29
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