摘要：针对化工生产领域除尘设备中脉冲喷吹管出口气流参数分布不均匀现象, 设计4种不同型面喷嘴, 定量分析喷嘴结构参数与出口流场品质间的相互关系, 并借助计算流体力学软件进行数值模拟研究。结果表明:喷吹管入口边界条件保持相同, 气流通过扩张型、直角型、收缩型和圆角型喷嘴后, 滞止压力损失率分别为29.28%、22.03%、15.44%、9.10%, 且圆角型喷嘴出口截面各项气流参数的分布均匀性最优;表明喷嘴与喷吹管连接部位型面采用圆角型设计不仅能够减少气流机械能损失, 降低清灰系统能耗, 还可提高喷嘴出口流场各项气流参数的分布均匀性;增大喷嘴与喷吹管连接部位曲面倒圆半径, 以及减小喷嘴开孔直径, 有利于改善喷嘴出口流场各项气流参数分布的均匀性, 优化流场品质。

关键词：喷嘴；型面参数；流场分布；优化；数值模拟

Abstract：Aiming at the non-uniformity distribution phenomenon of airflow parameters in the pulse injection tube of dust removal equipment in chemical production field, four different profile of nozzles were designed to quantitatively analyze the relationship between the nozzle structure parameters and outlet flow field quality, and the numerical simulation study was carried out by means of computational fluid dynamics software. The results show that when inlet pressure boundary conditions are remained the same, the loss rate of the stagnation pressure are 29.28% 、22.03%、 15.44% and 9.10% respectively, after the airflow passes through the divergent nozzle, right angle nozzle, convergent nozzle and fillet nozzle. The distribution uniformity of the airflow parameters of the fillet nozzle outlet cross section is the best. It is shown that nozzle and pulse injection tube connection site profile designed with fillet will not only able to reduce the mechanical energy loss and the energy consumption of the cleaning system, but also improve the distribution uniformity of airflow parameters in the nozzle's outlet flow field. It is helpful to improve the distribution uniformity of airflow parameters and optimize the flow field quality in nozzle's outlet flow field by increasing the radius of nozzle and pulse injection pipe connection site profile and reducing nozzle diameter.

Keywords: nozzle；profile parameters；flow distribution；optimization；numerical simulation