| 庞斌,廉子凡,张洋洋,等.喷射参数对甲醇进气道喷雾液滴粒径分布的影响[J].内燃机工程,2025,46(4):10-18. |
| 喷射参数对甲醇进气道喷雾液滴粒径分布的影响 |
| Influences of Injection Parameters on the Droplet Size Distribution of Methanol Intake Port Spray |
| DOI：10.13949/j.cnki.nrjgc.2025.04.002 |
| 关键词:甲醇进气道喷射 液滴粒径分布 喷射压力 喷孔直径 喷醇方向 |
| Key Words:methanol port injection droplet size distribution injection pressure orifice diameter methanol injection direction |
| 基金项目:国家自然科学基金项目（52222604，T2341001） |
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| 摘要:建立了甲醇进气道喷射三维数值模拟模型，开展了喷醇压力、喷孔直径、喷醇方向、来流速度等关键参数对甲醇喷雾粒径分布的影响研究。结果表明，随着喷醇压力的升高，甲醇喷雾粒径分布向液滴粒径减小的方向偏移，同时索特平均直径和特征直径DV10、DV50、DV90（DVX指喷雾液滴群中累计粒度分布百分数达X%时所对应的粒径）也降低。随着喷孔直径减小，甲醇喷雾液滴粒径索特平均直径和特征直径减小，液滴粒径跨度降低，产生的附壁油膜质量减少。当喷射角度与逆向来流呈45°时可产生更多数量的小粒径液滴。增加来流速度会使喷雾粒径分布向减小方向偏移，并使索特平均直径和特征直径减小。 |
| Abstract:A three-dimensional numerical simulation model was developed to investigate the impact of key parameters including injection pressure， orifice diameter， injection direction， and incoming flow velocity on the droplet size distribution of methanol spray. The results reveal that increased injection pressure leads to a shift of the droplet size distribution towards smaller droplet sizes， accompanied by reduction in Sauter mean diameter （SMD） as well as characteristic diameters DV10， DV50 and DV90 （DVX refers to the droplet size of the droplets which accounts for X% of the spray dropet cluster）. As the orifice diameter decreases， SMD and characteristic diameters of methanol spray droplets decrease， and the span of droplet size （SDS） and wall film quality also decrease. When the injecting angle is 45° against reverse incoming flow， more small-sized droplets are generated. Increasing the incoming flow velocity causes the spray droplet size distribution to shift towards smaller sizes， resulting in decreased SMD and characteristic diameters. |
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