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Computational Investigation of Swirling Supersonic Jets Generated Through a Nozzle-Twisted Lance

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Abstract

The dynamic characteristics of supersonic swirling jets generated through a nozzle-twisted lance are numerically studied. The essential features of the swirling jets are identified by defining a deviation angle. The effects of nozzle twist angle (NTA) on swirling flow intensity, coalescence characteristics, and dynamic parameter distributions of the jets are discussed. The rotational flow characteristics are revealed. The results show that the jets from the nozzle-twisted lance are imparted to a circumferential rotating movement around the lance axis, and such swirling flow is enhanced by increasing NTA. The enhanced swirling flow causes weaker coalescence of the jets, faster attenuations of the axial velocity, and higher heat transfer rate between the jets and surroundings. The supersonic core length, however, is found to be less sensitive to the swirling flow intensity. The radial spreading of the jets, changing non-monotonically with NTA, arrives at its maximum at 5 deg of NTA. Furthermore, the swirling flow induces a considerable tangential velocity component, and as a result, a holistic and effective horizontal swirling flow field develops. The y-vorticity distribution range and the corresponding magnitude turn larger with increasing NTA, which promote the vortex motion of the local fluid element and thus intensify the local mixing.

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Acknowledgments

The authors are grateful for the financial support provided by the National Natural Science Foundation of China (Grant 51104037), and the Fundamental Research Funds of the Central Universities of China (Grants N120402010, N140204008).

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Authors and Affiliations

  1. Laboratory of Multiphase Transport and Reaction Engineering, Department of Ferrous Metallurgy, School of Metallurgy, Northeastern University, 3-11 Wenhua Road, Heping District, P. O. Box 312, Shenyang, 110819, Liaoning, P.R. China

    Mingming Li (PhD Student), Qiang Li (Associate Professor) & Zongshu Zou (Professor)

  2. Department of Ferrous Metallurgy, School of Metallurgy, Northeastern University, 3-11 Wenhua Road, Heping District, Shenyang, 110819, Liaoning, P.R. China

    Xizhong An (Professor)

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  1. Mingming Li
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  2. Qiang Li
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  3. Zongshu Zou
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Correspondence to Qiang Li.

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Manuscript submitted May 22, 2016.

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Li, M., Li, Q., Zou, Z. et al. Computational Investigation of Swirling Supersonic Jets Generated Through a Nozzle-Twisted Lance. Metall Mater Trans B 48, 713–725 (2017). https://doi.org/10.1007/s11663-016-0851-2

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