Droplet characteristics of multi-plume flash boiling spray evaluation using SLIPI-LIEF/Mie planar imaging technique
Droplet characteristics of multi-plume flash boiling spray evaluation using SLIPI-LIEF/Mie planar imaging technique
复制标题
DOI：
10.1016/j.energy.2023.128876
复制
发表时间：
2023-08
期刊：
影响因子：
9
通讯作者：
Shuyi Qiu;B. Yao;Shangning Wang;Weixuan Zhang;D. Hung;Min Xu;Xuesong Li
中科院分区：
文献类型：
--
作者：
Shuyi Qiu;B. Yao;Shangning Wang;Weixuan Zhang;D. Hung;Min Xu;Xuesong Li
闪蒸雾化是一种很有前途的方法，其主要分解很大程度上依赖于喷嘴内的相变。液滴尺寸测量对于闪蒸喷雾的基础研究至关重要。然而，气相的干扰和液滴密集区域的多重散射显着影响喷雾液滴尺寸测量的准确性。在这项工作中，我们利用三相结构激光照明平面成像、激光诱导激基复合物荧光/米氏散射 (3p-SLIPI-LIEF/Mie) 方法来评估两孔燃油喷射器和 ECN Spray G 喷射器的液滴尺寸分布。考察了不同温度和压力边界条件下燃料喷雾的SMD特性，并强调了闪蒸喷雾崩溃条件。结果表明，所提出的 SLIPI-LIEF/Mie 方法优于 PDI 技术，可以提供更全面的结果，同时保持令人满意的精度。 SLIPI-LIEF/Mie 结果表明，近场羽流膨胀和 SMD 分布与闪蒸相变过程密切相关。塌陷区域中的液滴比初级羽流区域中的液滴大。然而，无论喷雾是否塌陷，喷雾的SMD都会随着燃料温度的升高、环境压力的降低以及喷射压力的升高而降低。
Flash boiling atomization is a promising approach whose primary breakup heavily relies on the phase change inside the nozzle. Droplet size measurement is crucial for fundamental studies of flash boiling sprays. However, the interference of the vapor phase and multiple scatterings in droplet-dense regions notably impact the accuracy of spray droplet size measurement. In this work, we utilized a three-phase structured laser illumination planar imaging, laser-induced exciplex fluorescence/Mie scattering (3p-SLIPI-LIEF/Mie) method in evaluating the droplet size distribution for a two-hole fuel injector and an ECN Spray G injector. The SMD characteristics of the fuel spray under various temperature and pressure boundary conditions were examined, and flash boiling spray collapse conditions were emphasized. The results show that the proposed SLIPI-LIEF/Mie method is superior to PDI techniques in providing more comprehensive results while maintaining satisfactory accuracy. The SLIPI-LIEF/Mie results show that the near-field plume expansion and SMD distribution strongly correlate with the flash boiling phase transition process. The droplet in the collapsed region was larger than that in the primary plume regions. However, whether or not the spray collapses, the SMD of the spray reduces as the fuel temperature increases, ambient pressure decreases, and injection pressure increases.