| 孙英杉,王金鹏,葛冀欢.汽油机缸内直喷喷嘴结构参数对雾化特性的影响研究[J].内燃机工程,2020,41(5):9-15. |
| 汽油机缸内直喷喷嘴结构参数对雾化特性的影响研究 |
| Influence of structure parameters of direct injection nozzle on atomization characteristics for gasoline engine |
| DOI：10.13949/j.cnki.nrjgc.2020.05.002 |
| 关键词:发动机 缸内直喷 喷嘴设计 雾化特性 |
| Key Words:GDI, nozzle design bubble distribution atomization characteristics |
| 基金项目:国家创新创业训练计划项目 |
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| 摘要:以某商用涡旋式喷嘴为基础,改变喷孔尺寸对其进行优化设计,并通过试验进行质量流率、喷雾发展过程、雾化角、动作延迟以及粒径分布分析。结果表明：优化设计的喷嘴其质量流率均大于原来喷嘴的质量流率,而质量流率的线性度接近原商用喷嘴。在相同喷射时间5ms及喷射压力9.5MPa下,当喷嘴孔径由 0.55mm增大为 0.7mm时,喷雾发展过程较为快速,燃油流量增加约56%,雾化角增加10度,但喷雾不稳定性也随之提高,雾化粒径增大。在不同喷油压力下的雾化角变化较大,靠近喷嘴的喷雾轮廓与孔口设计有关,喷油压力增加时,其质量流率也会随之增加,当喷油压力上升时,雾化粒径分布在10μm~20μm的体积分数会随之上升,从而提高雾化程度。 |
| Abstract:The nozzle size was changed and designed, based on a commercial electromagnetically driven scroll nozzle, and analyzed the mass flow rate, spray development process, atomization angle, nozzle delay and particle size distribution through experiments. The results show that: The mass flow rate of optimized nozzle is higher than that of original nozzle, and linearity of mass flow rate is close to that of original commercial nozzle. When the nozzle diameter increased from 0.55mm to 0.7mm, the spray development was faster, the fuel flow rate increased by 56%, the atomization angle increased by 10 degrees, but the spray instability increased, and particle size increased, under the same injection time (5ms) and injection pressure (9.5MPa). The atomization angle varies greatly under different injection pressure, and the spray profile near nozzle is related to the design of the orifice, and the mass flow rate will increase with the increase of injection pressure. When the injection pressure rises, the volume fraction of the atomized particle size distribution in range of 10μm~20μm will increase accordingly, which can improve the atomization. |
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