| 基于CFD的巴歇尔槽进口连接段结构优化与水动力学特性分析 |
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| 引用本文： | 许虎,吴文勇,王振华,乔长录,王秋良.基于CFD的巴歇尔槽进口连接段结构优化与水动力学特性分析[J].灌溉排水学报,2021,40(2). |
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| 作者姓名： | 许虎 吴文勇 王振华 乔长录 王秋良 |
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| 作者单位： | 石河子大学水利建筑工程学院,新疆石河子832000;石河子大学水利建筑工程学院,新疆石河子832000;中国水利水电科学研究院,北京100048;深圳市水务规划设计院,广东深圳518000 |
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| 基金项目： | “十三五”国家重点研发计划项目(2016YFC0400102,2017YFC0403205);国家自然科学基金项目(51769030)。 |
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| 摘 要： | 【目的】探究巴歇尔槽上游进口连接段最优形式。【方法】采用SolidWorks建模软件对不同进口连接段形式(内接圆弧过渡段、外接圆弧过渡段、直面过渡段、无过渡段)建立物理模型,利用ANSYS18.0软件对模型进行网格划分与数值模拟,运用Tecplot后处理软件,在自由出流情况下,分析不同进口连接段形式对水头损失、水面线、测流误差、流速及压强的变化情况,得出输水效率最高的连接段形式。【结果】采取进口连接段过渡的巴歇尔槽相比无连接段过渡的水流流线更平缓;无连接段过渡的巴歇尔槽局部水头损失最大、内接圆弧过渡段形式巴歇尔槽局部水头损失最小。巴歇尔槽测流精度相对误差随着来流流量的增大而减小;当来流流量为0.01 m3/s时,4种设计方案测流误差分别为:16.3、15.9、15.4、17.7;当来流流量为0.2 m3/s时,4种设计方案测流误差分别为:6、5.9、5.2、5.5。4种设计方案中,直面过渡段形式巴歇尔槽测流精度最高;巴歇尔槽纵剖面速度、压强云图变化梯度明显,流速最大处位于喉道段、静水压强最大处位于上游雍水段。湍动能云图数值最大处位于气相所分布的区域,气相相较于液相具有更强的流动性,分子间的能量交换更加剧烈,内能消耗更大。【结论】测流工作应该在来流流量较大时完成、进口连接段加以衬砌,防止因静水压强导致巴歇尔槽形变而产生测流误差。
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| 关 键 词： | 巴歇尔槽 进口连接段 数值模拟 测流精度 |
Optimizing Structure of Inlet Connection Section of the Parshall Flume and Analyzing Hydrodynamics in It Using CFD |
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| XU Hu,WU Wenyon,WANG Zhenhua,QIAO Changlu,WANG Qiuliang.Optimizing Structure of Inlet Connection Section of the Parshall Flume and Analyzing Hydrodynamics in It Using CFD[J].Journal of Irrigation and Drainage,2021,40(2). |
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| Authors: | XU Hu WU Wenyon WANG Zhenhua QIAO Changlu WANG Qiuliang |
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| Institution: | (College of Water Conservancy and Architectural Engineering,Shihezi University,Shihezi 832000,China;The China Institute of Water Resources and Hydropower Research,Beijing 100048,China;Shenzhen Water Planning&Design Institute Co,Ltd.,Shenzhen 518000,China) |
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| Abstract: | 【Background】Agricultural production in China uses approximately 70%of the total water consumed nationwide and developing sustainable irrigation districts faces many challenges such as channel leakage,inferior and dated irrigation projects,dwindling water supply and low water utilization efficiency.Optimal allocation of water resources is a key to developing water-saving irrigation,in which the Parshall flume has been widely used due to its high accuracy,convenient reading and ease of installation.In water conveyance,selection of a connection form in the flume controls the conveyance efficiency of the channel and its associated water resource allocation.【Objective】The purpose of this paper is to determine the optimal structure of the upstream inlet connection section of the Parshall flume,as well as the associated water pressure loss,water surface line,the measurement errors,velocity and pressure cloud under different inlet connections.【Method】We first used the SolidWorks software to design physical models of four inlet connection sections:interconnected arc transition,external arc transition,direct transition.The control was without transition.The ANSYS18.0 software was then used to generate the meshes and simulate water flow for each design.The simulated data were analyzed using the Tecplot and Origin software.【Result】The filament line in the Parshall flume was smoother with an inlet connection than without one.The local waterhead loss in the flume was the highest in transition without connection section and the lowest in the inner circular transition section.The relative errors of the flow measured by the flume decreased with incoming water flow rate,and when the incoming flow rate was 0.01 m3/s,the errors of the above four designs were 16.3,15.9,15.4 and 17.7 respectively.When the incoming flow rate increased to 0.2 m3/s,the errors of the above four designs reduced to 6,5.9,5.2 and 5.5 respectively.Among the four designs,the rectilinear transition section was most accurate.The change in velocity gradient and pressure cloud in the longitudinal profile of the flume was noticeable,and the highest velocity and water pressure were in the throat section and the upstream hydrosphere,respectively.The largest turbulent kinetic cloud map was in the region of the gas phase distribution,and the gas phase was more fluidic than the liquid phase.The energy exchange between molecules is more intense and consumes internal energy.【Conclusion】The flume is more accurate when the incoming flow rate is high.Adding an inlet connection section can reduce the measurement errors induced by flume deformation caused by water pressure. |
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| Keywords: | Parshall flume inlet connection section numerical simulation flow measurement precision |
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