CFD study on the flow distribution of an annular multi-hole nozzle
CFD study on the flow distribution of an annular multi-hole nozzle
复制标题
环形多孔喷嘴流量分布的CFD研究
DOI：
10.1002/cjce.23602
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发表时间：
2019
影响因子：
2.1
通讯作者：
Li Xiwen
中科院分区：
文献类型：
--
作者：
He Yu;Sun Zhibin;Shen Baojun;Guo Fang;Yang Yili;Zhan Xiaobin;Li Xiwen
采用大涡模拟（LES）方法结合VOF（volume of fluid）模型，研究了进口体积流量、孔径和喷嘴下游距离对喷嘴流量分布的影响。为了量化流量分布的均匀性，引入了非均匀性参数、润湿面积和均匀性指数。从喷嘴喷出的喷雾根据其结构分为两种模式，即部分撞击喷雾（PIS）和完全撞击喷雾（FIS）。与其他三种喷嘴相比，孔径为400 μm的喷嘴出口流量分布最均匀。此外，具有较大孔和较高入口体积流量的喷嘴可以容易地实现大的润湿面积。然而，具有较小孔和相对较低的入口体积流量的喷嘴更倾向于实现均匀的流量分布。入口体积流量越大，应采用的孔越大，以实现相对均匀的流量分布。
Annular multi‐hole nozzles are commonly used to disperse one or more types of material in chemical processing, agricultural irrigation, firefighting, and so on. In this study, the LES (large eddy simulation) method combined with the VOF (volume of fluid) model was employed to investigate the impacts of inlet volume flow rate, hole diameter, and distance downstream of nozzle on the flow distribution of the nozzle. To quantify the uniformity of the flow distribution, the non‐uniformity parameter, wetted area, and uniformity index were introduced. The sprays ejected from the nozzle are separated into two modes in accordance with their structure, namely partially impinging sprays (PIS) and fully impinging sprays (FIS). Compared with the three other types of nozzles investigated in this study, the nozzles with a 400 μm hole diameter can achieve the most uniform flow distribution of the nozzle outlet. In addition, the nozzle with larger holes and a higher inlet volume flow rate can easily achieve a large wetted area. However, the nozzle with smaller holes and a relatively low inlet volume flow rate is more inclined to achieve a uniform flow distribution. The larger the inlet volume flow rate, the larger the holes that should be adopted to achieve a relatively uniform flow distribution.