热膜式剪应力传感器在破碎波作用下的应用初探

发布时间：2018-05-30 22:21

  本文选题：波浪破碎 + 壁面剪应力传感器　； 参考：《实验流体力学》2017年03期

【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。
[Abstract]:The correct understanding of the shear stress on the bed surface in the broken wave area is of great significance for revealing the mechanism of coastal sediment transport and geomorphologic evolution. The turbulence and vortex after wave breaking will have a significant effect on the shear stress of bed surface. The MEMS flexible hot-film wall shear stress sensor was used to measure the shear stress of bed surface in a wave flume. The experimental results show that the wall shear stress sensor can be applied to the measurement of bed shear stress under the action of broken wave. The direction of bed shear stress can be determined by the near bottom velocity before breaking point. The variation of bed shear stress is relatively gentle before wave breaking, and the fluctuation and extreme value of bed shear stress will increase after wave breaking. The extreme value of the mean value of the maximum bed shear stress along the slope appears behind the incident point of the cracked tongue.
【作者单位】： 南京水利科学研究院;河海大学港口海岸与近海工程学院;水文水资源与水利工程科学国家重点实验室;港口航道泥沙工程交通行业重点实验室;
【基金】：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)
【分类号】：TV148
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本文编号：1957063