高压条件下椭圆孔喷雾破碎雾化分析

doi:10.3969/j.issn.1671-7775.2021.03.007

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摘要为研究椭圆喷孔的雾化机理，采用LES与VOF相耦合的数值模型对椭圆喷孔在背压3 MPa时，不同高喷射压力下（120、140和160 MPa）初次破碎的换轴现象与分解过程进行研究，并结合圆孔与椭圆孔的远场雾化试验，分析了初次破碎对远场喷雾的影响.结果表明：椭圆孔在高喷射压力下也会出现换轴现象，且换轴现象的次数会随着喷射压力的提高而增加；喷射压力的提高并不会影响初次破碎的液相长度，但会加快液相破碎的进程，其中液相的褶皱程度由喷雾的涡量决定；对比椭圆孔和圆孔宏观喷雾试验结果后发现，椭圆孔结合高压能够加剧初次破碎的不稳定性，促进初次破碎并提高二次雾化质量.

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	陆大勇
	贾和坤
	叶泽

关键词 ：柴油喷嘴, 喷雾, 喷射压力, 大涡模拟, 椭圆喷孔

Abstract：The large eddy simulation (LES) and the volume of fluid (VOF) model were coupled to investigate the mechanisms of spray axis-switching phenomenon and breakup process for elliptical orifice at different high injection pressures of 120, 140 and 160 MPa with fixed backpressure of 3 MPa. The effects of primary breakup process on the macro spray were analyzed based on the macro spray tests of circular and elliptical diesel nozzles. The results show that the elliptical orifice undergoes the axis-switching phenomenon even under high injection pressure, and the number of axis-switching phenomena is increased with the increasing of injection pressure. The injection pressure has little effect on the primary elliptical spray liquid core length, while the increasing of injection pressure is helpful to accelerate the liquid core breakup into small droplets.With the increasing of injection pressure, the more vortex structures which promote the formation of spray mushroom-like structures are generated at the spray head. Considering with the characteristics of primary elliptical spray, the turbulence of primary elliptical spray is improved by the increasing of injection pressure, which is helpful to intensify the instability of primary breakup process and improve the quality of macro spray.

Key words： diesel nozzle spray injection pressure large eddy simulation elliptic orifice

收稿日期: 2020-02-28

基金资助:江苏高校优势学科建设工程项目（PDPA）；江苏省研究生实践创新计划项目（KYCX17_1778）

作者简介: 陆大勇(1994—)，男，江苏灌南人，硕士研究生(15751002165@163.com)，主要从事内燃机排放污染物后处理的研究. 贾和坤(1982—)，男，江苏镇江人，副教授(human_cm@126.com)，主要从事内燃机燃烧过程及排放控制的研究.

引用本文:

陆大勇, 贾和坤，叶泽. 高压条件下椭圆孔喷雾破碎雾化分析[J]. 江苏大学学报（自然科学版）, 2021, 42(3): 291-297. LU Dayong, JIA Hekun, YE Ze. Analysis of spray′s breakup and atomization of elliptical diesel nozzle under high injection pressure[J]. Journal of Jiangsu University(Natural Science Eidtion) , 2021, 42(3): 291-297.

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http://zzs.ujs.edu.cn/xbzkb/CN/10.3969/j.issn.1671-7775.2021.03.007 或 http://zzs.ujs.edu.cn/xbzkb/CN/Y2021/V42/I3/291

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