考虑动态摩阻的管道泄漏水力瞬变数值模拟

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...

Numerical simulation of hydraulic transient in a leakage pipe considering unsteady friction

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.