| 风沙流中沙粒相浓度的高频测量 |
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| 引用本文： | 杨斌,王元,刘江,张洋.风沙流中沙粒相浓度的高频测量[J].实验流体力学,2010,24(5). |
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| 作者姓名： | 杨斌 王元 刘江 张洋 |
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| 作者单位： | 1. 西安交通大学流体机械及工程系,西安,710049;西北大学化工学院,西安,710069
2. 西安交通大学流体机械及工程系,西安,710049 |
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| 基金项目： | 国家自然科学基金面上项目(10972176); 新疆自治区科技攻关重大项目(200833121) |
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| 摘 要： | 在大气边界层风洞内采用高速CMOS相机记录了定常来流条件下运动沙粒的图像。根据二进制图像标记像素的连通性,从数字图像中提取相机拍摄区域内沙粒的数量N,由此计算得到风沙流的瞬时含沙量q。获取图像的同时,使用恒温式热线风速仪MiniCTA配合55R49热膜探头测量观测域上方主流位置和跃移层顶部附近的风速变化。实验结果表明,即使在定常风速下,瞬时含沙量也是非稳定的,为了真实的记录瞬时含沙量的变化,测量频率至少需要在100Hz以上。定常风速下,高浓度风沙流含沙量的最大波动幅度可达到其时均值的50%以上;而当定常来流风速值在沙粒起动风速附近时,低浓度风沙流的含沙量具有明显的间歇性。
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| 关 键 词： | 风沙流 含沙量 高速摄影 湍流脉动 起动风速 |
High-frequency measurement of the sand phase's concentration in wind-sand flow |
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| YANG Bin,WANG Yuan,LIU Jiang,ZHANG Yang.High-frequency measurement of the sand phase''s concentration in wind-sand flow[J].Experiments and Measur in Fluid Mechanics,2010,24(5). |
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| Authors: | YANG Bin WANG Yuan LIU Jiang ZHANG Yang |
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| Institution: | YANG Bin1,2,WANG Yuan1,LIU Jiang1,ZHANG Yang1(1.Department of Fluid Machinery and Engineering,Xi'an Jiaotong University,Xi'an 710049,China,2.School of Chemical Engineering,Northwest University,Xi'an 710069,China) |
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| Abstract: | The instantaneous fluctuation of sand concentration in eolian sand transport was investigated experimentally by high-speed photography.CMOS high-speed digital camera was adopted to record transport instants,and specific particle identification method was introduced to count particle number of images.Series of sand concentration under steady wind condition were obtained accordingly.Also,wind speed above saltation layer was measured simultaneously by hot-wire anemometer equipped with hot-film probe.The result... |
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| Keywords: | wind-sand flow sand concentration high-speed photography turbulence fluctuation lift-off velocity |
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