Experimental study on scour and flow field in a scour hole around a T-shape spur dike in a 90° bend |
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作者姓名: | Masoud GHODSIAN Mohammad VAGHEFI |
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作者单位: | Masoud GHODSIAN(Water Engineering Research Center, Tarbiat Modares University, Tehran, Iran);Mohammad VAGHEFI(Persian Calf University, Bushehr, Iran) |
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摘 要: | In this paper results of experimental study on scour and flow field around a T-shape spur dike in a 90 degree channel bend are presented. Experiments were conducted in a laboratory channel to measure the variations of bed topography under a clear water condition. The three dimensional flow field was measured by an Acoustic Doppler Velocimeter in a scour hole due to a T-shape spur dike. It was found that by increasing the Froude number and length of spur dike the amount of scour increases. Increasing the wing length of spur dike decreases the scour. The amount of scour at the upstream of spur dike is much more as compare to that at the downstream of spur dike. By increasing the wing length of spur dike the zone of flow separation expands. As a result the sizes of vortex increase. Details of flow field are also addressed in the paper.
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关 键 词: | 三维流场测量 弯曲通道 冲刷坑 丁坝 T型 冲刷试验 声学多普勒流速仪 Froude数 |
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