| 浓度梯度引起的固相速度测量误差 |
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| 引用本文： | 石健,郭波,弓扶元,何小刚,李丹勋.浓度梯度引起的固相速度测量误差[J].水科学进展,2011,22(1):67-74. |
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| 作者姓名： | 石健 郭波 弓扶元 何小刚 李丹勋 |
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| 作者单位： | 清华大学水利水电工程系, 水沙科学与水利水电工程国家重点实验室, 北京, 100084 |
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| 基金项目： | 国家自然科学基金资助项目(50779023); 清华大学SRT资助项目(082T0019)~~ |
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| 摘 要： | 用粒子示踪技术测量明渠挟沙水流中固相颗粒的速度时,流速梯度和浓度梯度的存在会引起测量误差.选用典型的垂线流速与浓度分布公式对时均速度测量误差进行分析,得出了误差的解析表达式.对该解析式的理论分析表明,测量误差恒小于零,即速度测量值比实际值偏小.误差的大小与采样窗口的相对位置、尺寸及颗粒的悬浮指数有关.对误差大小随自变量...
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| 关 键 词： | 流速 浓度 梯度 误差 粒子示踪测速 |
| 收稿时间： | 2010-03-22 |
Bias error induced by concentration gradients in the measurement of sediment-laden flows |
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| SHI Jian,GUO Bo,GONG Fu-yuan,HE Xiao-gang,LI Dan-xun.Bias error induced by concentration gradients in the measurement of sediment-laden flows[J].Advances in Water Science,2011,22(1):67-74. |
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| Authors: | SHI Jian GUO Bo GONG Fu-yuan HE Xiao-gang LI Dan-xun |
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| Institution: | State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | The presence of concentration gradients shifts the effective location of the reported mean velocity away from the sampling bin's center in sediment-laden flow measurement with particle tracking velocimetry.Under typical velocity and concentration profiles for open channel flows,the bias error proves to be constantly less than zero,leading to an underestimate of the actual velocity.The error is closely related to three variables which are the relative location of the flow,the size of the sampling bin,and the... |
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| Keywords: | velocity concentration gradient bias error particle tracking velocimetry |
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