明满流过渡的数值模拟及工程应用

Numerical Simulation and Engineering Application of the Transition Process Between Free surface and Pressure flow

为了模拟明流到满流的过渡过程,利用HydroInfo水利信息系统软件、采用圣维南方程组和Preissmann狭缝法建立了明渠和管道相结合的一维非恒定流水动力计算模型,并通过具有解析解或试验结果的算例,验证方法的可行性。最后将其应用到北京市南水北调来水调入密云水库调蓄工程(简称密云水库调蓄工程),并模拟加压工况,通过模拟结果得知产生明满过渡流时管道中水位、流量的变化过程,能够提前采取相应措施降低明满过渡流对输水管道的影响。结果表明对实际工程的安全运行有指导意义。

In order to simulate the transition process from free surface flow to pressure flow,one-dimensional unsteady hydrodynamic calculation model combining open channel and pipeline was established by using Hydroinfo water information system software,saint-venant equations and Preissmann slit method,and the feasibility of the model was verified by an example with analytical solution or test results.Finally,it is applied to the regulation and storage project of Beijing south-to-north water diversion project,and the pressure condition is simulated.Through the simulation results,the change process of water level and flow in the pipeline when the open-filled transition flow is generated can be calculated,and the corresponding measures can be taken in advance to reduce the influence of the open-filled transition flow on the water transmission pipeline.The results show that it is instructive to the safe operation of practical engineering.