Study of Morphological Collapse on Sub/Supercritical Gasoline Multi-Hole Jets

被引：0
|
作者：
Qin J. [1 ,2 ]
Yuan L. [1 ,2 ]
Pei Y. [2 ]
Ren Y. [2 ]
Wang Z. [2 ]
Liu W. [2 ]
机构：
[1] Internal Combustion Engine Research Institute, Tianjin University, Tianjin
[2] State Key Laboratory of Engines, Tianjin University, Tianjin
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2019年 / 52卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Collapse; Flash boiling; Fuel temperature; Sub/supercritical;
D O I：
10.11784/tdxbz201809096
中图分类号：
学科分类号：
摘要：
Based on the gasoline direct injection(GDI)engine common condition of temperature and pressure in-cylinder, the high-speed photography and schlieren method were used to compare the macro characteristics of the sub/supercritical states of gasoline multi-hole, single-hole, and isooctane multi-hole jets in high-temperature environments. The results demonstrate that when the fuel temperature rises from the subcritical state to the supercritical state, the center of the gasoline multi-hole jet collapses and shows a morphological protrusion of the front surface. This differs from the typical dendritic spray structure and collapse under severe flashing conditions, during which the penetration of the jet continuously increases, the cone angle continuously decreases, and the jet width first decreases and then increases. The development trends of the penetration, cone angle, and width of the sub-critical gasoline single-hole jets differ from those of the multi-hole jet, which indicates that the interference and overlap of the adjacent plumes affect the jet's morphological structure. With gasoline in the subcritical state, this interference and overlap cause the jet contour to shrink inward, thereby reducing its cone angle and width, while in the supercritical state of gasoline, the interference and overlap promote the collapse of the contour center of the multi-hole jet. Compared with one-component isooctane, the difference in the boiling point of multi-component vaporization and gasification leads to a sharp flash boiling in the liquid phase of the gasoline jet, causing airflow entrainment in the low-pressure nuclear region in the direction of the jet axis. This contributes to the eventual collapse of the jet center, which then leads to the gasoline jet width being larger than that of the isooctane jet when the fuel is in the supercritical state. Ultimately, the interference of the adjacent plumes and the airflow entrainment of the low-pressure nuclear region in the axial direction are the main reasons for the collapse of the multi-hole jet's center and the protrusion of the jet front faces of the sub-supercritical gasoline, by contrast with the sub/supercritical gasoline single-hole jet and the isooctane multi-hole jet. © 2019, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.
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页码：1081 / 1089
页数：8
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