摘要
为了提高管道系统泄漏的模拟和判断精度,将瞬态加速类(Brunone模型)和加权函数类(Zielke模型和Vardy模型)两类动态摩阻模型用于水力瞬变泄漏建模和模拟,并将计算结果与已有的试验数据、模拟结果进行对比分析。结果表明:与传统摩阻模型和存在简化误差的Brunone模型相比,Zielke模型和Vardy模型能更加精确地模拟泄漏管中压力和流量信号变化;管道泄漏会引起管道压力和流量畸变,这种畸变是由泄漏导致的压力和流量产生新的信号反射造成的;泄漏流量和泄漏位置均会影响管中压力和流量的畸变、幅值和衰减程度。
To improve the simulation and judgment accuracy of leakage in pipeline systems,two distinct unsteady friction models,including the Brunone model of the transient acceleration type and the weighting function type(Zielke and Vardy models),were introduced to simulate the hydraulic transient leakage,and the results were compared with the experimental and simulation data in the published papers for further analyses.The calculated results show that Zielke model and Vardy model can simulate the pressure and flow signal changes more accurately compared with traditional friction models and the Brunone model due to simplification errors.The leakage leads to the distortion of pressure and flow because of new signal reflection caused by the leakage in the pipeline.Both the leakage discharge and position affect the degree of distortion,amplitude and attenuation of the transient pressure and the flow in the pipeline.
作者
李赟杰
周领
欧传奇
刘德有
LI Yunjie;ZHOU Ling;OU Chuanqi;LIU Deyou(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;International Center on Small Hydro Power,Hangzhou 310002,China)
出处
《水利水电科技进展》
CSCD
北大核心
2021年第1期62-68,共7页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金(51679066,51839008)
霍英东教育基金会青年教师基金(161068)。
关键词
水力瞬变
泄漏检测
动态摩阻
特征线法
hydraulic transient
leakage detection
unsteady friction
method of characteristics
