水利水电科技进展2016，Vol.36Issue(3)：20-25,6.DOI:10.3880/j.issn.1006-7647.2016.03.005
射流孔间距对横流中两孔射流稀释特性的影响
Effect of spacing of nozzles on dilution properties of two tandem jets in cross-flow
摘要
Abstract
In order to study the effects of the spacing of nozzles on the dilution efficiency of a multi-hole diffuser, the realizable k-ε model of the Computational Fluid Dynamics ( CFD) software Fluent was used to simulate the effective cross-flow velocity, the jet concentration trajectory, the velocity field, and the concentration field of two tandem jets in cross-flow with different spacing. The results show that, as the spacing of nozzles increases, the sheltering effect of the first jet weakens, the effective cross-flow velocity increases, and the degree of curvature of the jet concentration trajectory increases. Near the jet, there is an exponential relationship between the concentration trajectory and the distance downstream of the nozzle with an exponent of 1/2, and an exponential relationship between the concentration trajectory and the spacing of nozzles with an exponent of -0. 27. At more distance from the jet, there is an exponential relationship between the concentration trajectory and the distance downstream of the nozzle with an exponent of 1/3, and an exponential relationship between the concentration trajectory and the spacing of nozzles with an exponent of -0. 18. The spacing of jets has little influence on the concentration of the first jet. However, the concentration of the second jet decays faster in the direction of flow when the spacing of nozzles decreases, and the concentration grows more stable when the distance from the nozzle is greater than eight times the nozzle diameter.关键词
多孔射流/射流间距/稀释特性/横向有效流速/浓度轨迹线/浓度场Key words
multiple tandem jets/spacing of nozzles/dilution property/effective cross-flow velocity/concentration trajectory/concentration field分类
数理科学引用本文复制引用
肖洋,梁嘉斌,李志伟..射流孔间距对横流中两孔射流稀释特性的影响[J].水利水电科技进展,2016,36(3):20-25,6.基金项目
国家自然基金(51179055) （51179055）
江苏高校优势学科建设工程项目(SYS1401) （SYS1401）
