| 热膜式剪应力传感器在破碎波作用下的应用初探 |
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| 引用本文： | 郝思禹,夏云峰,徐华,蔡喆伟.热膜式剪应力传感器在破碎波作用下的应用初探[J].实验流体力学,2017,31(3):60-65. |
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| 作者姓名： | 郝思禹 夏云峰 徐华 蔡喆伟 |
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| 作者单位： | 1.南京水利科学研究院, 南京 210029 |
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| 基金项目： | 国家重大科学仪器设备开发专项项目2013YQ040911国家自然科学基金项目51309158 |
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| 摘 要： | 破波区床面剪应力的正确认知对于揭示海岸泥沙输运以及地貌演变的机理具有重要意义。波浪破碎以后带来的紊动和涡旋会对床面剪应力产生显著的影响。采用MEMS柔性热膜式壁面剪应力传感器在波浪水槽中开展了破碎波作用下的床面剪应力测量应用测试。实验结果表明该壁面剪应力传感器可以应用于破碎波作用下的床面剪应力测量。在破波点之前可以根据近底流速辅助该传感器判断床面剪应力的方向。床面剪应力在波浪破碎之前变化较为平缓，在波浪破碎之后床面剪应力的波动和极值都会增大。斜坡上沿程最大床面剪应力均值的极值出现于卷破水舌入射点之后。
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| 关 键 词： | 波浪破碎 壁面剪应力传感器 床面剪应力 卷破波 |
| 收稿时间： | 2017-03-06 |
Preliminary application of hot-film wall shear stress sensor under breaking waves |
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| Affiliation: | 1.Nanjing Hydraulic Research Institute, Nanjing 210029, China2.College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China3.The State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering, Nanjing 210098, China4.Key Laboratory of Port, Waterway and Sedimentation Engineering of Ministry of Transport, Nanjing 210024, China |
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| Abstract: | The knowledge of the bed shear stress under breaking waves is essential for understanding the sediment transport and beach morphology in the surf zone. The turbulence and vortexes generated by breaking waves have a significant effect on the bed shear stress. Application tests of the bed shear stress measurement under breaking waves by the MEMS flexible hot-film shear stress sensor are conducted in a wave flume. The experimental results show that the sensor can be applied to the measurement of the bed shear stress under breaking waves. Before the breaking point, the direction of the bed shear stress can be determined by the near-bed velocity. The change of the bed shear stress is gentle before wave breaking. The fluctuations and the peak value of the bed shear stress increase after wave breaking. The extreme value of the average maximum bed shear stress along the slope appears after the plunging point. |
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