慢充水条件下多气阀管道充水排气过程的试验与数值研究,Water

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慢充水条件下多气阀管道充水排气过程的试验与数值研究
Water ( IF 3.0 ) Pub Date : 2019-11-28 , DOI: 10.3390/w11122511
Jintao Liu , Di Xu , Shaohui Zhang , Meijian Bai

本文研究了多气阀管道在慢充水条件下充水排气过程中涉及的物理过程，并建立了全耦合的水-气两相分层数值模型来模拟该过程。该模型分别应用圣维南方程和垂直平均纳维-斯托克斯方程（VANS）来描述管道中的水和空气，并将空气阀模型引入空气的VANS方程作为源项。同时采用有限体积法和二阶精度的隐式双时间步长法（IDTS）求解该数值模型，实现水气运动的全耦合。然后，利用管道内压力演化和气阀风速演化的实验数据对模型进行了验证，分别表征了注水和排气过程。结果表明，该模型在捕捉物理过程方面表现良好，数值与实验结果具有合理的一致性。该协议表明，本文提出的模型提供了一种实用的方法，可以在水缓慢填充条件下模拟具有多个气阀的管道中的注水和排气过程。

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Experimental and Numerical Study on Water Filling and Air Expelling Process in a Pipe with Multiple Air Valves under Water Slow Filling Condition

This paper investigates the physical processes involved in the water filling and air expelling process of a pipe with multiple air valves under water slow filling condition, and develops a fully coupledwater–air two-phase stratified numerical model for simulating the process. In this model, the Saint-Venant equations and the Vertical Average Navier–Stokes equations (VANS) are respectively applied to describe the water and air in pipe, and the air valve model is introduced into the VANS equations of air as the source term. The finite-volume method and implicit dual time-stepping method (IDTS) with two-order accuracy are simultaneously used to solve this numerical model to realize the full coupling between water and air movement. Then, the model is validated by using the experimental data of the pressure evolution in pipe and the air velocity evolution of air valves, which respectively characterize the water filling and air expelling process. The results show that the model performs well in capturing the physical processes, and a reasonable agreement is obtained between numerical and experimental results. This agreement demonstrates that the proposed model in this paper offers a practical method for simulating water filling and air expelling process in a pipe with multiple air valves under water slow filling condition.

更新日期：2019-11-28

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