| 流速仪在垂直偏角情况下测速误差的研究 |
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| 引用本文： | 杜文成,吴海山,田连生,曲忠如.流速仪在垂直偏角情况下测速误差的研究[J].水文,2000,20(1):31-34. |
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| 作者姓名： | 杜文成 吴海山 田连生 曲忠如 |
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| 作者单位： | 1. 北京市水文总站,北京,100038
2. 河北省水文水资源勘测局,河北,石家庄,050031 |
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| 摘 要： | 悬索缆道测流,往往使流速仪形成垂直偏角,对流速有一定影响.分别率定了LS25-1型旋桨流速仪和LS68-1型旋杯流速仪在不同下倾角时与流速的关系流速仪的垂直偏角对流速有明显影响,并随偏角的加大而增加,偏角在10°以内影响不大;同时也率定了LS68-1型旋杯流速仪自动调整垂直下倾角时与流速的关系,下倾角在10°～30°以内对流速无明显变化,超过30°时,流速系统偏小.解决办法是(1)流速小有偏角时用LS68-1型旋杯流速仪,流速大时用LS25-3型旋桨流速仪,二者均有自动调平的功能;(2)合理选择铅鱼的型式和重量,本文提供了数据.
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| 关 键 词： | 流速仪 偏角 测速 误差 |
| 文章编号： | 1000-0852(2000)01-0031-04 |
Research on Flow Velocity Measuring Error under Vertical Dip Angle of Current Meter |
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| DU Wen-cheng,WU Hai-shan,TIAN Lian-sheng,QU Zhong-ru.Research on Flow Velocity Measuring Error under Vertical Dip Angle of Current Meter[J].Hydrology,2000,20(1):31-34. |
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| Authors: | DU Wen-cheng WU Hai-shan TIAN Lian-sheng QU Zhong-ru |
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| Abstract: | The current meter, when measuring flow velocity with a suspended cableway, always composes a vertical angle which affacts result of velocity measurement.Various relationship between dip angle and flow velocity of M25-1 vertical-axis current meter and LS68-1 horizontal-axis current meter is discussed. The research shows that the larger vertical dip angle results in the larger error of the now velocity. Flow velocity of LS68-1 horizontal-axis current meter is acceptable when dip angel is within 10 to 30 However,the measuring velocity is systematic shifting smaller when the dip angle is over 30 comparing with the actual velocity. Two methods that may narrow the error of measuring flow velocity are discussed.1).The LS68-1 horizontal-axis current meter is recommended when the dip angle is small,and LS25-1 vertical-axis current meter can be used when the dip angle is large.2).Choose suitable lead fish with reasonable type and weight. |
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| Keywords: | velocity meter dip angle effect |
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