【摘要】：針對聲學(xué)多普勒流速儀(ADV)運(yùn)用于清澈水質(zhì)的水流中精度較低的問題,采用了一種向清澈水流中摻混適量懸浮顆粒物的方法顯著提高ADV的測量精度。通過對比摻混懸浮顆粒物與清澈水質(zhì)中ADV的流速測量結(jié)果,發(fā)現(xiàn)摻混適量懸浮顆粒物后,流速測量數(shù)據(jù)明顯更穩(wěn)定,符合水槽流場的實(shí)際情況。給出了懸浮顆粒物的推薦含量為106 g/m~3。采用該方法,在水槽中沿垂向布置10個流速測點(diǎn),通過調(diào)整水泵變頻器頻率來改變流速,測量了不同流速時的水槽斷面垂向流速分布。發(fā)現(xiàn)流速沿垂向分布不均勻,呈線性剪切流分布。水槽出流口的布置方式和水槽壁面及底面摩阻是產(chǎn)生斷面流速沿垂向分布不均勻性的原因。最后,通過最小二乘法擬合給出了水泵變頻器的頻率與斷面平均流速的線性關(guān)系。
[Abstract]:In order to solve the problem of low accuracy of acoustic Doppler velocimeter (ADV) in clear water flow, a method of mixing proper amount of suspended particles into clear water flow is adopted to improve the measurement accuracy of ADV. By comparing the velocity measurement results of ADV in mixed suspended particles and clear water quality, it is found that the velocity measurement data are obviously more stable after mixing proper amount of suspended particles, which is in line with the actual situation of flume flow field. The recommended content of suspended particles is 106 g 路m ~ (- 3). By using this method, 10 velocity measuring points are arranged vertically in the flume, and the vertical velocity distribution of the flume section is measured by adjusting the frequency of the pump frequency converter to change the velocity. It is found that the velocity distribution along the vertical direction is uneven and shows a linear shear flow distribution. The arrangement of the flume outlet and the friction of the wall and bottom of the flume are the reasons for the uneven distribution of the cross section velocity along the vertical direction. Finally, the linear relationship between the frequency of pump frequency converter and the average velocity of section is given by least square fitting.
【作者單位】： 大連理工大學(xué)海岸和近海工程國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金項(xiàng)目(51409041) 遼寧省博士科研啟動基金項(xiàng)目(20141024)
【分類號】：TV131.6

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本文編號：2507439