供水管网交叉型节点水质混合规律研究

Study on Mixing Law of Water Quality at Cross Junctions in Water Supply Network

通过装置实验和数值模拟实验,探究邻向入流十字节点和双T节点处水质混合规律。首先基于质量守恒定律,推导节点混合程度评价指标;通过对比装置实验和数值模拟实验的结果,验证十字节点和双T节点数值模型的准确性,并分析混合程度随雷诺数的变化。在此基础上,利用响应曲面法设计实验,回归得到两类节点混合程度计算模型,利用方差分析验证模型显著性;结合响应曲面,对比分析两类节点混合效果,并为管网设计及改扩建提供建议。

The mixing law of water quality at the adjacent inflow cross junction and double-T junction is explored through device experiments and numerical simulation experiments.Firstly,the mixing degree index is derived based on the law of mass conservation.The accuracy of the numerical model of the two junction types is verified by comparing the device experiment results with those of numerical simulation,and the variation of mixing degree with Reynolds number is analyzed.On this basis,the response surface method was used to design the experiment,and the two types of junction mixing degree calculation models were obtained by regression,and the significance of the models was verified by variance analysis.The mixing effect of the two types of junction was compared and analyzed,and suggestions are provided for the design and expansion of the pipe network based on the response surface.