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Characterization of hydrodynamics around plates shaped like dragonfly wings as a sediment reduction measure in a sewer system
Water Research ( IF 11.4 ) Pub Date : 2025-01-16 , DOI: 10.1016/j.watres.2025.123152
Zhiwei Li, Bing Wang, Li Zhang, Qiuhua Liang, Bin Sun, Feifei Wang
Water Research ( IF 11.4 ) Pub Date : 2025-01-16 , DOI: 10.1016/j.watres.2025.123152
Zhiwei Li, Bing Wang, Li Zhang, Qiuhua Liang, Bin Sun, Feifei Wang
Sediment control is a major concern in sewer management. Early studies focused on the parameters affecting the efficiency of existing dredging facilities, and novel long-term sediment reduction measures have not been developed. Superior sediment reduction performance has been demonstrated for plates folded at 25° placed in a pipe. In this study, flushing experiments are carried out to validate the efficacy of using hydrodynamic characteristics to analyze sediment reduction performance. A detached-eddy simulation is performed to characterize the hydrodynamics around various plates shaped like dragonfly wings placed in pipes to enhance sediment reduction performance. Experimental results indicate that the maximum sediment reduction efficiency occurs in the middle section of the plates for both coarse and fine sediment beds, where the flushing thickness is extended by 1.3 cm and 3.2 cm, respectively. However, the sediment reduction efficiency is maximized for mixed sediment beds downstream, where the flushing thickness is extended by 2.4 cm. The results of numerical simulations indicate that compared with conventional sediment reduction measures, the plates produce less detrimental effects on the streamwise velocities near the pipe bottom at the plate front and increase the time-averaged vertical and transverse velocities as well as the overall turbulent kinetic energy. Therefore, the use of plates shaped like dragonfly wings is an effective sediment reduction measure.
中文翻译:
描述蜻蜓翅膀形状的板周围的流体动力学特性,作为下水道系统中减少沉积物的措施
沉积物控制是下水道管理中的一个主要问题。早期研究集中在影响现有疏浚设施效率的参数上,并且尚未开发出新的长期沉积物减少措施。对于放置在管道中的 25° 折叠板,已证明具有卓越的沉积物减少性能。在本研究中,进行了冲洗实验,以验证利用水动力特性分析沉积物减少性能的有效性。执行分离涡流模拟以表征放置在管道中的各种形状像蜻蜓翅膀的板周围的流体动力学,以提高沉积物减少性能。实验结果表明,对于粗和细沉积床,板的中段沉积物减少效率最高,冲洗厚度分别延长了 1.3 cm 和 3.2 cm。然而,下游混合沉积物床的沉积物减少效率最高,冲洗厚度延长了 2.4 厘米。数值模拟结果表明,与传统的泥沙减少措施相比,板块对板前部管底附近流向速度的不利影响较小,并增加了时间平均垂直和横向速度以及整体湍流动能。因此,使用蜻蜓翅膀形状的板是一种有效的减少沉积物的措施。
更新日期:2025-01-16
中文翻译:
描述蜻蜓翅膀形状的板周围的流体动力学特性,作为下水道系统中减少沉积物的措施
沉积物控制是下水道管理中的一个主要问题。早期研究集中在影响现有疏浚设施效率的参数上,并且尚未开发出新的长期沉积物减少措施。对于放置在管道中的 25° 折叠板,已证明具有卓越的沉积物减少性能。在本研究中,进行了冲洗实验,以验证利用水动力特性分析沉积物减少性能的有效性。执行分离涡流模拟以表征放置在管道中的各种形状像蜻蜓翅膀的板周围的流体动力学,以提高沉积物减少性能。实验结果表明,对于粗和细沉积床,板的中段沉积物减少效率最高,冲洗厚度分别延长了 1.3 cm 和 3.2 cm。然而,下游混合沉积物床的沉积物减少效率最高,冲洗厚度延长了 2.4 厘米。数值模拟结果表明,与传统的泥沙减少措施相比,板块对板前部管底附近流向速度的不利影响较小,并增加了时间平均垂直和横向速度以及整体湍流动能。因此,使用蜻蜓翅膀形状的板是一种有效的减少沉积物的措施。