梯形渠道翼柱型量水槽试验研究与数值模拟

【目的】探究翼柱型量水槽在梯形渠道量水的适用性。【方法】对4种不同收缩比的翼柱型量水槽进行水力性能模型试验,并运用Fluent 17.1软件对其中2种收缩比的量水槽进行了数值模拟。通过对上游水位、流量和收缩比等进行分析,拟合得到了量水槽流量公式,并从测流精度、佛汝德数、临界淹没度以及水头损失等方面对其量水性能进行了分析。【结果】翼柱型量水槽在梯形渠道量水性能优良,水位-流量相关度极好,R2可达0.997 1以上,拟合的流量公式简明易用,测流平均误差为2.41%,上游佛汝德数均小于0.4,临界淹没度达0.85以上,通过数值模拟对量水槽水面线和流量进行误差分析,将实测值与模拟值进行比较,二者平均误差分别为3.80%和3.72%,与试验结果高度吻合,模拟结果准确可靠。【结论】翼柱型量水槽可用于梯形渠道量水,且量水精度满足明渠测流规范相关要求。Fluent软件可用于翼柱型量水槽数值模拟。

Experimental Study and Numerical Simulation of Wing Pillar-shaped Measuring Flume in Trapezoidal Channel

【Objective】The purpose of this study is to explore the applicability of wing pillar-shaped measuring flume in trapezoidal channel.【Method】Hydraulic performance model tests were carried out in trapezoidal channels through four different flume shrinkage ratios, and two of them were numerically simulated. Through the analysis of upstream water level, flow and shrinkage ratio, the flow formula was fitted. The accuracy of flow measurement, upstream Froude number, critical submergence and head loss were also analyzed.【Result】The Hydrometric performance of the wing pillar-shaped measuring flume in trapezoidal channel was great, and the correlation between water level and flow rate was excellent. The square of the correlation coefficient was more than 0.997 1.The fitting flow formula was simple and easy to use. The average error of flow measurement was 2.41%, the Froude number in upstream was less than 0.4, and the critical submergence degree was more than 0.85. The numerical simulation errors of surface line and flow in measuring flume were 3.80% and 3.72% respectively which showed that the simulation results were accurate and reliable.【Conclusion】The performance of the wing pillarshaped measuring flume meets the relevant technical requirements of the open channel flow measurement specification and can be used for water measurement in trapezoidal channels. The results showed that Fluent 17.1 was reliable and feasible for numerical simulation of wing pillar-shaped measuring flume.