| 引用本文: | 李 伟,张新燕,刘朝阳.仿舵型量水槽体形模拟研究[J].灌溉排水学报,2022,41(5):118-123. |
| LI Wei,ZHANG Xinyan,LIU Zhaoyang.仿舵型量水槽体形模拟研究[J].灌溉排水学报,2022,41(5):118-123. |
|
| 摘要: |
| 【目的】探索具有水流平顺、流态稳定、测流准确、水头损失小等优良特性的量水槽线形。【方法】针对基于水下装备流线型体构造的量水槽，选取4种量水槽体形，运用数值模拟方法研究不同体形的量水槽在不同流量条件下的流速分布、水面线、佛汝德数、水头损失、壅水高度等水力性能。【结果】流线型体扩散段较陡时，仿舵型量水槽的壅水高度和水头损失相对较小。不同流量条件下，4种体形的量水槽上游佛汝德数均低于0.5；壅水高度均低于3 cm；计算流量与模拟流量的平均误差为2.42%，测流精度较高，且均具有较小的水头损失。【结论】卡克斯仿舵型量水槽在各流量条件下的水面线均较为平稳且流速分布更加均匀，在不同流量条件下其水头损失均小于0.35 cm，测流精度大于98.27%，水力性能最优，可作为仿舵型量水槽的基本体形。 |
| 关键词: 矩形渠道；仿舵型量水槽；数值模拟；流线型体 |
| DOI：10.13522/j.cnki.ggps.2021551 |
| 分类号: |
| 基金项目: |
|
| The Impact of Geometry of Rudder-like Flume on Its Performance and Accuracy |
|
LI Wei, ZHANG Xinyan, LIU Zhaoyang
|
|
1. School of Water Conservancy and Construction Engineering, Northwest A & F University, Yangling 712100, China;
2. Key Laboratory of Agricultural Soil and Water Engineering Ministry of Education Northwest A & F University, Yangling 712100, China
|
| Abstract: |
| 【Objective】Flume is a hydraulic device widely used in hydraulic engineering projects. Its performance depends on many factors. In this paper, we explore the alignment of measuring flume with smooth flow, stable flow pattern, accurate flow measurement and small head loss, based on the streamline structure of underwater equipment.【Method】 Four flumes with different streamline shapes were studied. Numerical simulation was used to study their hydraulic performance under different flow rates, including velocity distribution, water surface profile, Froude number, water head loss and backwater height.【Result】It is found that the backwater height of the flume and the head loss both decreased when the diffusion became steeper. The upper Froude numbers of the four flumes were less than 0.5, regardless of the flow rates. The backwater heights were less than 3 cm. The average error between the measured and simulated flow rate was less than 2.42%, indicating that the flow measurement is accurate, and the head loss is small.【Conclusion】The water surface profile of the KKS type flume is more stable, and the velocity distribution is more uniform under different flow rates, compared to other flumes. Its head loss is less than 0.35 cm, the flow measurement accuracy is more than 98.27%. Its hydraulic performance is hence the best among the flumes we compared. |
| Key words: rectangular channel; rudder-like measuring flume; numerical simulation; streamline shape |
