吴正人,石祎炜,彭子春,杨小娜,刘梅.双介质喷嘴雾化特性数值模拟研究[J].包装工程,2023,44(15):184-193.
WU Zheng-ren,SHI Yi-wei,PENG Zi-chun,YANG Xiao-na,LIU Mei.Numerical Simulation of Atomization Characteristics of Dual-medium Nozzle[J].Packaging Engineering,2023,44(15):184-193. |
| 双介质喷嘴雾化特性数值模拟研究 |
| Numerical Simulation of Atomization Characteristics of Dual-medium Nozzle |
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| DOI：10.19554/j.cnki.1001-3563.2023.15.024 |
| 中文关键词: 双介质喷嘴 索特平均直径 雾化扩散角 颗粒均匀度 通流面积 |
| 英文关键词: dual-medium nozzle Sauter mean diameter atomization diffusion angle particle uniformity flow area |
| 基金项目:国家自然科学基金项目(12172129) |
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| 中文摘要: |
| 目的 双介质喷嘴雾化效果直接影响烟卷加料工艺的进一步提升，通过对雾化过程进行数值模拟，方便对雾化特性进行透彻的分析，提升雾化效果。方法 采用数值模拟方法构建两相流连续相流场与DPM离散态双向耦合的数值模型，研究蒸汽压力、液体流量以及双介质喷嘴结构对喷嘴雾化特性的影响。结果 适当增加蒸汽压力，可以在不影响最大流速、颗粒粒径均匀度及颗粒中值粒径的情况下，减小雾化扩散角，小幅度地增加喷射距离，雾化细度变好，进而提高雾化效果。随着有机液流量的增加，雾化扩散角增大，喷射距离增加，雾化粒径均匀度变好，从而使雾化效果变好。液体路通流面积越大喷雾的贯穿距离越小，气路通流面积越大喷雾的雾化扩散角度越大。若需要得到较好的雾化效果，需要保证较小的蒸汽路通流面积，与此同时液路侧保持正常开度。结论 适当地提高有机液流量或者蒸汽压力，以及采用较小蒸汽路通流面积，同时液路侧保持正常开度的结构，有利于提高料液喷洒的均匀性，减少了料液的浪费，提高了烟丝制备的工艺水平。 |
| 英文摘要: |
| The atomization effect of the double-medium nozzle directly affects the further improvement of the cigarette feeding process. The work aims to thoroughly analyze the atomization characteristics and improve the atomization effect through the numerical simulation of the atomization process. The numerical simulation method was used to build a two-way coupling numerical model of continuous two-phase flow field and DPM discrete state, and the effects of steam pressure, liquid flow rate and dual-medium nozzle structure on nozzle atomization characteristics were studied. Properly increasing the steam pressure could reduce the atomization diffusion angle, slightly increase the spray distance, improve the atomization fineness, and enhance the atomization effect without affecting the maximum flow rate, particle size uniformity and particle median size. With the increase of the organic liquid flow rate, the atomization diffusion angle increased, the spray distance increased, and the atomization particle size uniformity became better, thus making the atomization effect better. The larger the flow area of the liquid path was, the smaller the penetration distance of the spray was, and the larger the flow area of the gas path was, the larger the atomization diffusion angle of the spray was. If better atomization effect was required, it was necessary to ensure a small flow area of the steam path, and at the same time, the normal opening of the liquid path side was maintained. Properly increasing the flow rate or steam pressure of organic liquid, and adopting a structure with a small flow area of the steam path and a normal opening at the side of the liquid path are conducive to improving the uniformity of the spray of the liquid feed, reducing the waste of the liquid feed, and improving the technological level of cut tobacco preparation. |
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