The present study uses the self-similar approach, developed by Pistiner (2020), for solving the water hammer equation during the process of valve closure in infinite long pipeline. The obtained solution shows that the transient flow in the pipeline is characterized by three zones: the “near zone” located near the closing valve and is characterized by a positive flow; the “far zone” in the pipeline lying at an infinite distance from the valve where the flow is also positive and the “intermediate backflow zone”, which is lying among the above-mentioned zones and is characterized by reverse flow. The results obtained in this study may be useful to give some insights into the understanding of transient flow process in pipes as well as provide approximate estimation for transient waves in pipes and finally, the applicability of the model to predict head distribution in the pipeline has been shown.

本研究使用由Pistiner（2020）开发的自相似方法来求解无限长管道阀门关闭过程中的水锤方程。所获得的解决方案表明，管道中的瞬变流具有三个区域：位于关闭阀附近的“附近区域”，并具有正向流动；位于“近区”的区域具有正向流动。管道中的“远区”与流量同样为正的阀门相距无穷远，而“中间回流区”位于上述区域之间，其特点是逆流。这项研究获得的结果可能有助于深入了解管道中的瞬态流动过程，并为管道中的瞬态波提供近似估计，最后，