数字农科院2.0

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： Chuan Wang;Hao Yu;Hao Li;Li Zhang

作者机构：

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

期刊名称： Ocean Engineering

ISSN： 0029-8018

年卷期： 2025 年 320 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

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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