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Study on three-dimensional expansion characteristics of four wall combustion-gas jets in confined liquid space

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Abstract

To explore further the launch mechanism of the new underwater launching technology proposed in this paper, the expansion characteristics of four wall combustion-gas jets in confined liquid space must be studied firstly. The experimental device is designed, and the high-speed digital photographic system is adopted to obtain the expansion sequence processes of Taylor cavities formed by the four wall jets. Meanwhile, the influence of the injection pressure on the axial expansion property of the four wall jets is discussed. Based on the experiments, a three-dimensional unsteady mathematical model is established to simulate the turbulent flow process of the four wall jets expanding in liquid, and the temporal and spatial distribution laws of phase, pressure, temperature, and velocity and the evolution rules of vortices are illustrated in detail. Results show that, accompanied by the jets expanding downstream, the four wall combustion-gas jets get close to each other and achieve convergence eventually under induction of the interference effect between multiple jets. Meanwhile, the heads of the Taylor cavities separate from the observation chamber wall and offset to the central axis of the observation chamber with time going on. The numerical simulation results of the four wall combustion-gas jets coincide well with the experimental data.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant 11372139).

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Authors and Affiliations

  1. School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Zhitao Hu & Yonggang Yu

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  1. Zhitao Hu
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  2. Yonggang Yu
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Correspondence to Yonggang Yu.

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Hu, Z., Yu, Y. Study on three-dimensional expansion characteristics of four wall combustion-gas jets in confined liquid space. Acta Mech. Sin. 33, 341–355 (2017). https://doi.org/10.1007/s10409-017-0641-3

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  • DOI: https://doi.org/10.1007/s10409-017-0641-3

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