无压圆管的水力分析研究

Analysis on Hydraulic Features of Non-pressure Flow in Round Pipe

依据水力学的基本原理,通过对圆形过水断面管道自流状态下不同流量的水力分析,提出了利用过水包角进行圆形过水断面管道水力计算的新方法。与传统的计算方法相比实现3项突破:一是利用数学分析法进行水力计算,消除了计算过程中的误差,提高了求解精度;二是计算过程更加简单便于记忆;三是分门别类总结出圆形断面几种特殊情况下的水力计算方法,在实际工作中有很高实用价值。

Based on the principles of hydraulics,the hydraulic features of water flow at different flow rates under non-pressure status are analyzed systematically,and a new method with central angle as the key factor for calculating hydraulic parameters of water flow in round pipe is given in this paper.Comparing with the existing methods,there are three main advantages for the new method： ①a mathematic model is used to calculate the hydraulic parameters of water flow in round pipe,which is helpful to control error and improve accuracy;②calculating process is more simple and understandable;③suitable models are given for several special situations,which is helpful for the practical utilization of the new method.