无压流隧洞渐变段局部水头损失系数计算的创新方法研究  

An Innovative Method for Local Head Loss CoefficientCalculation in Gradual Section of Non - pressure Flow Tunnel

作　　者：李江峰 李娟 戚印鑫 朱斌德 惠强 刘敏杰 王豪杰 LI Jiangfeng;LI Juan;QI Yinxin;ZHU Binde;HUI Qiang;LIU Minjie;WANG Haojie(Xinjiang Research Institute of Water Conservancy and Hydropower,Urumqi,Xinjiang 830049,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China)

机构地区：[1]新疆水利水电科学研究院,新疆乌鲁木齐830049 [2]重庆交通大学土木工程学院,重庆400074 [3]新疆农业大学,新疆乌鲁木齐830052

出　　处：《水利与建筑工程学报》2023年第2期51-59,共9页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目“鱼鳃式沉沙系统水沙运动特性与除沙机理的研究”(51969030);新疆维吾尔自治区公益性科研院所基本科研业务经费资助项目“新疆某长距离引水隧洞的水流特性研究”(KY2022131)。

摘　　要：在长距离无压输水隧洞设计计算过程中,往往很难准确把握渐变段局部水头损失的大小,这就为实现精准输水设计增大了难度。为了探寻一种无压输水隧洞不同尺寸渐变段的局部水头损失系数的计算方法:过流面积比法,根据渐变段两个断面之间的水流能量方程,依托水工模型试验,应用“四点法”分别对于渐变段4个测点的水位、流速进行测试,利用局部水头损失的测算观测数据,分别采用比拟法、面积比法、直接法计算得出隧洞渐变段局部水头损失系数,与现行标准、文献进行相互对比,分析得出实用性与相关性,并得到结论认为,过流面积比法作为一种创新方法,具有一定的实用价值,为解决类似流态的渐变段局部水头损失系数计算提供借鉴。In the design and calculation process of long-distance unpressurized water transmission tunnel,it is often difficult to accurately determine the size of the local head loss in the gradual phase,which increases the difficulty to realize the accurate water transmission design.In order to explore a kind of non-pressure water conveyance tunnel of different size calculation method of local head loss coefficient of the gradual-flow area ratio method,based on the energy equation of flow between the two section of the gradual,relying on the hydraulic model test,the application of“four point”,respectively,for the gradual,the water level,velocity test in four points,based on the observation data of local head loss.The methods of analogy,gradual change section area ratio method,direct method calculated tunnel local head loss coefficient,compared with current standards and literature,practicality and correlation analysis,and concluded that the flow area ratio method is a innovation method for solving similar gradual change section of flow pattern which could provide reference for calculating local head loss coefficient.

关 键 词：无压流 渐变段 局部 计算 创新 

分 类 号：TV674[水利工程—水利水电工程]