|Water Science and Engineering 2020, 13(3) 233-242 DOI: https://doi.org/10.1016/j.wse.2020.09.001 ISSN: 1674-2370 CN: 32-1785/TV|
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Influence of flow rate and baffle spacing on hydraulic characteristics of a novel baffle dropshaft
Xi-chen Wang a, b, Jian Zhang a, *, Zong-fu Fu a, Hui Xu a, Ting-yu Xu a, Chen-lu Zhou a, b
a College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
Due to limited flow capacity and the instability of the asymmetric structure of traditional baffle dropshafts, a novel baffle dropshaft with a symmetric structure, adopting the construction shield well directly, is proposed for large-range flow discharge in deep tunnel drainage systems. In this study, a two-phase flow field of the novel baffle dropshaft with three different baffle spacings was simulated at seven different flow rates with a three-dimensional (3D) numerical model verified with experiments, to study hydraulic characteristics of this novel baffle dropshaft. The results show that the novel baffle dropshaft has a remarkable energy dissipation effect. Baffle spacing of the novel baffle dropshaft has a greater effect on flow patterns and baffle pressure distributions than the comprehensive energy dissipation rate. Flow rate is a critical issue for the selection of baffle spacing in the design. Some guidance on baffle spacing selection and structure optimization for the application of this novel baffle dropshaft in deep tunnel drainage systems is proposed.
|Keywords： Deep tunnel drainage system Baffle dropshaft CFD Experiments 3D Two-phase flow field|
|Received 2019-09-20 Revised 2020-04-08 Online: 2020-09-30|
This work was supported by the National Natural Science Foundation of China (Grants No. 51709087 and No. 51839008) and the Fifth “333 Project” of Jiangsu Province (Grant No. BRA2018061).
|Corresponding Authors: Jian Zhang|
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