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清华大学学报(自然科学版)  2016, Vol. 56 Issue (4): 387-393    DOI: 10.16511/j.cnki.qhdxxb.2016.24.008
  水利水电工程 本期目录 | 过刊浏览 | 高级检索 |
山地灌溉管道水力特性的数值模拟
刘家宏1, 周晋军1,2, 王浩1,3, 吕宏兴2
1. 中国水利水电科学研究院 流域水循环模拟与调控国家重点实验室, 北京 100038;
2. 西北农林科技大学 水利与建筑工程学院, 杨凌 712100;
3. 水利部 水资源与水生态工程技术研究中心, 北京 100044
Numerical simulation of the hydraulic characteristics of hilly irrigation systems
LIU Jiahong1, ZHOU Jinjun1,2, WANG Hao1,3, LV Hongxing2
1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China;
2. College of Water Resources and Architectural Engineering, Northwest Agriculture and Forestry University, Yangling 712100, China;
3. Research Center for Water Resources and Hydro-ecological Engineering, Ministry of Water Resources, Beijing 100044, China
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摘要 有压管道的水力特性是管道设计工作的依据和前提。为研究山地灌溉输水管道水力特性,该文建立山地灌溉输水管道水动力学数学模型,运用计算流体动力学数值模拟方法,对有压灌溉管道中凸起管段的水力特性进行模拟。该文以输入流量为控制变量,计算管道水流能量损失,分析了Re与管道凸起段135°弯头局部阻力系数的关系;研究输水管道凸起段水压和流速分布特性。结果表明:当Re<5.0×104时弯头局部阻力系数随着Re增大而迅速减小,当Re>7.0×104时弯头局部阻力系数趋于稳定,当2.3×104 4时,弯头Ⅰ、弯头Ⅱ、弯头Ⅲ、弯头Ⅳ局部阻力系数变幅范围为4.12~0.37;弯头处静压分布均表现出外侧压力大,内侧压力小;速度值的大小均表现为弯头外侧速度小,内侧速度大。
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刘家宏
周晋军
王浩
吕宏兴
关键词 山地灌溉管道局部阻力系数Reynolds数计算流体动力学    
Abstract:The hydraulic characteristics of pressurized pipelines are important for irrigation system designs. The hydrodynamics irrigation pipes in a hilly terrain were analyzed here using a computational fluid dynamics model. The energy losses in the pipeline were calculated with the input discharge as the control variable. The relationship between the Reynolds number and flow resistance coefficient of a convex section (a 135° elbow) was analyzed. The pressure and velocity distributions are presented for the pipeline. The results show that:1) when the Reynolds number is less than 5.0×104, the flow coefficient of the elbow decreases rapidly with increasing Reynolds number; 2) when the Reynolds number is more than 7.0×104, the flow coefficient is nearly constant; 3) when the Reynolds number is in the range of 2.3×104 and 7.0×104, the flow coefficient ranges in 4.12~0.37. The pressure on the backside of the elbow is high, while the inside pressure is low. The velocity distribution is just the opposite with a low velocity near the backside of the elbow and higher velocities near the inside.
Key wordshilly irrigation systems    flow coefficient    Reynolds number    computational fluid dynamics
收稿日期: 2015-12-05      出版日期: 2016-05-09
ZTFLH:  TV134  
引用本文:   
刘家宏, 周晋军, 王浩, 吕宏兴. 山地灌溉管道水力特性的数值模拟[J]. 清华大学学报(自然科学版), 2016, 56(4): 387-393.
LIU Jiahong, ZHOU Jinjun, WANG Hao, LV Hongxing. Numerical simulation of the hydraulic characteristics of hilly irrigation systems. Journal of Tsinghua University(Science and Technology), 2016, 56(4): 387-393.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.24.008  或          http://jst.tsinghuajournals.com/CN/Y2016/V56/I4/387
  图1 管段凸起部位管段网格划分图
  图2 弯头I、弯头II、弯头III、弯头IV 网格划分图
  图3 Re 与弯头局部阻力系数的对数相关关系
  图4 弯头Ⅰ、Ⅱ、Ⅲ、Ⅳ局部阻力系数与Re 关系
  图5 管段凸起部位管段静压分布图
  图6 弯头I、弯头II、弯头III、弯头IV 静压分布图
  图7 弯头I、弯头II、弯头III、弯头IV 速度矢量图
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