H型节点作为供水管网重要组成部分,来流在其中的不完全混合特性尚不清楚。本文研究供水管网中H型节点的不完全混合现象及其影响因素,旨在改善现有的水质模拟方法。结合计算流体力学(CFD)数值模拟和实验室实验,探讨多个因素(包括管径、三通间距、入口雷诺数比和出口雷诺数比)对H型节点不完全混合的影响。结果显示,管径对混合影响不大,而三通间距和出入口雷诺数比对混合程度有显著影响。此外,实验室实验结果与CFD模拟结果吻合良好,证实模拟的准确性,并为建立H型节点的不完全混合经验模型提供数据。最终,提出针对不同三通间距下的H型节点不完全混合经验模型,并建议在实际应用中根据具体情况选择合适的混合模型,以提升供水管网水质模拟的准确性,这对于保障水质安全和优化调度具有重要的实践意义。

As an important component of water supply networks, the H-junctions exhibit unclear characteristics of income-flow incomplete mixing. This paper investigates the phenomena and influencing factors of incomplete mixing at H-junctions within water supply networks, intending to improve existing water quality simulation techniques. By combining computational fluid dynamics (CFD) numerical simulations and laboratory experiments, the effects of various factors such as pipe diameter, spacing of tees, and inlet and outlet Reynolds number ratios on incomplete mixing at H-junctions were explored. The findings suggested that while pipe diameter has minimal influence on mixing, spacing of tees and inlet/outlet Reynolds number ratios significantly affect the degree of mixing. Moreover, the experimental results aligned well with CFD simulations, validating their accuracy and providing data for establishing an empirical model for incomplete mixing at H-junctions under different spacings of tees. Ultimately, an empirical model for H-junction incomplete mixing based on the specific spacing of tees conditions was proposed. Selecting appropriate mixing models in practice to enhance the accuracy of water quality simulations in water supply networks was recommended, which is crucial for ensuring water safety and optimizing operational scheduling.

TU991.33

国家重点研发计划项目(2022YFC3203803)；揭榜制科研项目(CE602022000203)；黑龙江省重点研发计划项目(2022ZX01A06)；2023年度新一轮黑龙江省“双一流”学科协同创新成果项目(LJGXCG2023-018)