Blockages are commonly formed in fluid pipelines such as water supply systems, which may greatly affect the internal flow states and conveyance capacities. This paper investigates the transient behavior of a pressured water pipeline with blockage under different transient wave perturbations based on the Computational Fluid Dynamics (CFD) model. To this end, a water pipeline is modeled in a 2D axisymmetric geometry with refined mesh and the blockage is modeled as a small, constricted section. Both the low and high-frequency waves (LFW and HFW), in terms of radial fundamental wave frequency of a pipeline, ∼a/R, with a being acoustic wave speed and R being pipe radius, are injected for the numerical analysis. Through this CFD model, both the axial and radial transient waves have been observed for different frequency wave injections, which are firstly validated by datasets available from former studies. After validations, the local flow characteristics, such as the velocity field, the vorticity field, and its temporal, spatial evolution in the vicinity of blockage during transient wave processes, including before and after transient wavefront passing, are elaborated and analysed in this study. The results indicate the significant influence of blockages on transient behaviors, especially under high-frequency wave conditions.

堵塞通常发生在供水系统等流体管道中，这可能会极大地影响内部流动状态和输送能力。本文基于计算流体动力学 (CFD) 模型研究了在不同瞬态波扰动下的有压水管道堵塞的瞬态行为。为此，将水管道建模为具有精细网格的二维轴对称几何图形，并将堵塞建模为一个小的收缩部分。低频和高频波（LFW 和 HFW），就管道的径向基波频率而言，∼ a / R，其中a是声波速度和R为管道半径，注入进行数值分析。通过该 CFD 模型，已经观察到不同频率波注入的轴向和径向瞬态波，这首先通过以前研究中可用的数据集进行了验证。经过验证，本文详细阐述和分析了瞬态波过程（包括瞬态波前通过前后）阻塞附近的速度场、涡量场等局部流动特征及其时空演变。结果表明阻塞对瞬态行为的显着影响，特别是在高频波条件下。