Experimental Study on Nystrom Streamline Measuring Flume in Rectangular Channel
In order to explore the performance and applicability of the flow metering flume in rectangular channels,the hydraulic performance tests were carried out by constructing the flow metering flume with different shrinkage ratios with Nystrom drip line.By analyzing the water depth of upstream and the critical water depth of throat section,the flow measurement formula of measuring flume was established,and the measuring characteristics of measuring flume,such as measuring accuracy,upstream Froude number,backwater height and head loss were discussed.The results show that the water depth in front of the measuring tank has a high correlation with the discharge,and the average error of measuring flow is 1.74%,which has a high measuring accuracy.The hydraulic factors of upstream Froude number,backwater height and head loss are all affected by the shrinkage ratio of water tank and overflow.Under the test conditions,the upstream Froude number is smaller than 0.4,the water flow is gentle,the height of backwater and head loss are small,and they all decrease with the increase of the shrinkage ratio of the water tank,and increase with the increase of the channel overflow.
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