Data to incorporate entrapped air pocket dynamics into SWMM (AirSWMMv2.0)

The paper proposes a novel methodology to locate and quantify entrapped air pockets created during pipe-filling events often found in intermittent water supply systems. Different filling conditions were tested in an experimental pipe with a high point. Measurements were taken and video recordings were carried out to assess air pocket volumes for different air release conditions at the downstream end of the pipe. The stochastic nature of air pocket creation resulted in varying air volumes. A new numerical model capable of simulating the air pocket creation, dragging and entrainment has been proposed. The new model, AirSWMM, was implemented as an extension of the Stormwater Management Model (SWMM) with stochasticity of air pocket formation reproduced by simulations with different air entrainment rates. The obtained numerical results show that the proposed model, even though based on a single-phase one-dimensional flow, can accurately locate and approximately quantify the entrapped air pocket volumes

该论文提出一种全新方法，用于定位并量化间歇性供水系统中管道充水过程所产生的截留气袋（entrapped air pockets）。研究在带有高点的实验管道内开展了多种充水工况测试，并通过采集实测数据与录制视频的方式，针对管道下游端的不同空气释放工况评估气袋体积。气袋生成过程的随机特性会导致气袋体积存在差异。本研究同时提出了一款可模拟气袋生成、拖拽与卷吸过程的新型数值模型。该模型AirSWMM被开发为雨水管理模型（Stormwater Management Model, SWMM）的扩展模块，通过设置不同空气卷吸速率的仿真复现了气袋形成的随机性。最终数值仿真结果表明，尽管该模型仅基于单相一维流动理论，仍可精准定位截留气袋并对其体积实现近似量化。