| 热敏式剪应力仪在波流动力研究中的应用 |
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| 引用本文： | 徐华,夏云峰,蔡喆伟,郝思禹,张世钊.热敏式剪应力仪在波流动力研究中的应用[J].实验流体力学,2017,31(3):78. |
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| 作者姓名： | 徐华 夏云峰 蔡喆伟 郝思禹 张世钊 |
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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： | 河口海岸泥沙运动直接受制于床面剪应力的大小，因此通过床面剪应力来研究泥沙运动基本问题是泥沙运动理论研究的重要途径，然而目前尚未有效形成波流复杂动力作用下床面剪应力的量测计算方法。本文利用基于微纳米技术的热敏式剪应力新型仪器，在波流长直水槽内开展了床面剪应力量测研究工作。研究表明，热敏剪应力仪响应频率高、稳定性好，量测成果较好地反映了波流作用下床面剪应力变化基本规律，热敏剪应力仪可用于波流等复杂动力作用下床面剪应力的量测。根据试验量测成果，提出了波流合成剪应力计算初步方法，可为复杂动力作用下泥沙运动基本理论问题的深入研究提供参考。
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| 关 键 词： | 热敏 剪应力 波流动力 泥沙运动 |
| 收稿时间： | 2017-03-02 |
Application of thermal shear stress gauge in study on wave-current dynamics |
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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 movement of sediment at estuary and coast is directly restricted by the bed shear stress. Therefore, the basic research on the influence of the bed shear stress on the sediment movement is important. However, there is no available method for measuring and computing the bed shear stress under a complicated dynamic condition like the wave current. This paper conducts the measurement and test research on the bed shear stress in a long launder of direct current by the new thermal shearometer based on micro-nanotechnology. As the research results show, the thermal shearometer has high response frequency and strong stability. The measuring result reflects the basic law of the bed shear stress with the wave and wave-current effect, and confirms that the method of measuring bed shear stress under wave-current condition with the thermal shearometer is feasible. Meanwhile, a preliminary method to compute the shear stress compounded by wave-current is put forward. It benefits further research on the basic theory of the sediment movement with complicated dynamic effects. |
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