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为计算给水管网中非恒定流动运行工况,使系统可以快速平稳地完成工况转换,以非恒定流动理论为基础,分别利用重分阻尼系数法划分时间步长的特征线法和引入摩阻附加项的玻尔兹曼网格法计算给水管网非恒定流动的数学模型,并应用于某小区给水管网的非恒定流动工况分析中.结果表明,在管网非恒定流工况下,当Re≤7 000时利用玻尔兹曼网格法计算,否则利用特征线法计算将提高计算的准确性和计算效率.
In order to calculate the working condition of unsteady flow in the water supply network, the system can quickly and smoothly complete the transition of working conditions. Based on the unsteady flow theory, the method of dividing the time step with the method of re-dividing damping coefficient is introduced respectively, The Boltzmann grid method with additional items is used to calculate the unsteady flow mathematical model of water supply network and to analyze the unsteady flow conditions of water supply network in a district.The results show that in unsteady flow conditions When Re≤7000, it is calculated by Boltzmann mesh method. Otherwise, the method of characteristic line method will improve the accuracy of calculation and calculation efficiency.