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The impact of nozzle spacing on the vortex evolution and dilution characteristics of pulsed jets in crossflow

文献类型： 外文期刊

作者： Wang, Chuan 1 ; Yu, Hao 2 ; Li, Hao 5 ; Zhang, Li 2 ;

作者机构： 1.GongQing Inst Sci & Technol, Int Shipping Res Inst, Jiujiang 332020, Peoples R China

2.Yangzhou Univ, Coll Hydraul Sci & Engn, Yangzhou 225009, Peoples R China

3.Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Peoples R China

4.Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg, Xian 710048, Peoples R China

5.Chinese Acad Agr Sci, Inst Farmland Irrigat, Xinxiang 453002, Peoples R China

6.Suzhou Vocat Inst Ind Technol, Suzhou 215100, Jiangsu, Peoples R China

关键词： Nozzle spacing; Pulse; Triple; Counter-rotating vortex pair; Diffusion

期刊名称：OCEAN ENGINEERING （ 影响因子：5.5； 五年影响因子：5.6 ）

ISSN： 0029-8018

年卷期： 2025 年 320 卷

页码：

收录情况： SCI

摘要： Buoyant jet technology has been widely applied in deep-sea discharge systems within marine engineering. However, research on pulsed buoyant jets in crossflows remains limited. This study systematically investigates the effects of relative nozzle spacing (S/D) on the vortex structures and dilution characteristics of multiple jets in single-nozzle, double-nozzle, and triple-nozzle configurations using unsteady numerical simulations. The findings reveal that, during the development of buoyant jets, the middle jet in odd-numbered nozzle configurations is more prone to bifurcation. Overall, the trajectories of the jets exhibit a logarithmic oscillatory increasing trend as they evolve. The trajectory height of the jets gradually increases with S/D and reaches its maximum significance at a stroke ratio (L/D) of 8.57. As S/D decreases, the inner rotating vortex in the counter-rotating vortex pairs on both sides undergoes progressive stretching deformation along the Z-direction, and the vortex center becomes increasingly indistinct. Furthermore, with increasing S/D, the intrusion depth Zi shows a linear increasing trend, while the intrusion length Xi exhibits a decreasing trend, and the wastewater intrusion volume follows a logarithmic increasing trend. When S/D exceeds 7.14, the wastewater intrusion volume stabilizes. At the same stroke ratio, the rate of decrease in Xi with increasing S/D is significantly greater than the rate of increase in Zi. In conclusion, this study reveals the variation patterns of jet trajectories, vortex structures, and wastewater intrusion characteristics of pulsed jets (1.71 <= L/D <= 8.57) under different nozzle spacings (4.29 <= S/D <= 10). The findings provide valuable guidance for the optimal design of deep-sea discharge diffusion systems and agricultural wastewater dilution projects, while also contributing to the theoretical foundation of pulsed jet dynamics.

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