摘要
为了提高灌区内的量水准确度,利用横向摆杆在水流冲击及扭转弹簧共同作用下产生的水平转动角度θ与渠道过水断面流速v之间存在的数学关系,提出一种基于流速面积法的明渠测流方法。通过对横向摆杆式明渠测流装置在矩形渠道中进行物理实验,并在FLUENT计算流体力学软件中采用VOF两相流模型和标准k-ε湍流模型对测流过程进行模拟仿真,综合分析该装置的测流性能及在测流过程中渠道水流的水力特性。对物理实验结果进行分析,发现测流公式的测流误差小于5%;对模拟仿真结果进行处理,发现矩形渠道过水断面中垂向流速分布随着水深的增加呈现出先增大后减小的趋势,最大流速位于水面以下;横向流速分布特点为中间大,两侧小,且边壁处的流速为0,符合水力学中的基本原理。研究结果表明该测流方法的测流精度符合取水计量的规定且横向摆杆装置对流场的扰动较小。
In order to improve the measurement accuracy in irrigation area,an open channel flow measurement method based on velocity area method is proposed by using the mathematical relationship between the horizontal rotation angle of transverse swing rod under the combined action of flow impact and torsion spring and the velocity of channel flow section. Through the physical experiment of the lateral swing rod open channel flow measuring device in the rectangular channel,and the simulation of the flow measuring process by using the VOF two-phase flow model and the standard k-ε turbulence model in the FLUENT computational fluid dynamics software,the flow measuring performance of the device and the hydraulic characteristics of the channel flow in the flow measuring process are comprehensively analyzed.The analysis of the physical experiment results shows that the flow measurement error of the flow measurement formula is less than 5%. After processing the numerical simulation results,it is found that the vertical velocity distribution in the cross section of rectangular channel increases first and then decreases with the increase of water depth,and the maximum velocity is below the water surface. The transverse velocity distribution is characterized by large in the middle and small on both sides,and the velocity at the side wall is 0,which is in line with the basic principle of hydraulics. The results show that the flow measurement accuracy of this method meets the requirements of water intake measurement and the transverse swing rod device has little disturbance to the flow field.
作者
范恬
周义仁
FAN Tian;ZHOU Yi-ren(College of Water Resources Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《节水灌溉》
北大核心
2022年第1期62-66,73,共6页
Water Saving Irrigation
基金
山西省自然科学基金面上项目(201701D121108).
关键词
明渠测流
横向摆杆
模拟仿真
测流精度
水面线
open channel flow measurement
lateral swing rode
simulation
flow measurement accuracy
water surface line
作者简介
范恬(1996-),女,硕士研究生,研究方向为水利信息化。E-mail:346954000@qq.com;通讯作者:周义仁(1969-),男,教授,主要从事新型传感器及水利信息化研究工作。E-mail:46571938@qq.com。
