Morphology Evolution of Three-Dimensional Scours Under Submerged Jets
Morphology Evolution of Three-Dimensional Scours Under Submerged Jets
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DOI：
10.3389/feart.2022.917447
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发表时间：
2022-07
期刊：
影响因子：
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通讯作者：
Ke Chen;Wang-ru Wei;Jun Deng
中科院分区：
文献类型：
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作者：
Ke Chen;Wang-ru Wei;Jun Deng
通过物理模型试验，测量了浸没斜射流冲刷均匀颗粒床表面的三维形态特征及其尺度随时间的变化规律，并进行了对比分析。研究了不同流速和水垫深度对冲刷孔深度、长度和宽度的影响。在冲刷形成初期，形态尺度变化更为剧烈，相对于水垫层深度，射流冲击流速对冲刷孔的影响更为显著；对于冲刷三个方向的最终尺度，相对于冲刷的长度和宽度，冲刷深度以更显著的速率发展。根据冲刷孔尺度的时域变化规律，得到了冲刷孔形成深度、长度和宽度之间的相关性。随着射流速度的增大和水垫层深度的减小，冲刷由宽浅形态逐渐向窄深形态发展；冲刷的三维形态特征对孔深的影响逐渐显现，似乎抑制了冲刷深度的发展。本文的试验结果为探讨三维形态特征对射流冲刷形成的影响提供了探索性研究，为水利工程水力运行耗能的更合理分析和评价奠定了基础。
Through physical model tests, the three-dimensional morphological features and their scale changes with time were measured and comparatively analyzed during the scouring of a homogeneous granular bed surface using submerged oblique jets. The effects of various flow velocities and water cushion depths on the depth, length, and width of the scour hole were studied. At the early stage of scour formation, the morphological scales changed more dramatically, and the jet impact flow velocity had a more significant effect on the scour hole relative to the depth of the water cushion; for the final scales in all three directions of the scour, the scour depth developed at a more significant rate relative to the length and width of the scour. The correlation between the depth, length, and width of scour hole formation was achieved based on the time-domain variation pattern of scour hole scales. As the jet velocity increased and the depth of the water cushion decreased, the scour gradually developed from a wide-shallow morphology to a narrow-deep morphology; the impact of three-dimensional morphological features of the scour on hole depth gradually became obvious, appearing to inhibit the development of scour depth. The results of the present experimental tests offered an exploratory study of the effect of three-dimensional morphological features on the formation of jet scours, having constituted the basis for more rational analysis and evaluation of energy dissipation for the hydraulic operation in water conservancy projects.