Hypergolic Ignition by Off-Center Binary Collision of Monoethanolamine-NaBH4 and Hydrogen Peroxide Droplets

被引:0
|
作者
Zhang, Dawei [1 ]
Song, Siduo [1 ]
Yu, Dehai [2 ]
Yuan, Yueming [2 ]
Liu, Hongmei [1 ,3 ]
Liu, Xuedong [1 ]
Fan, Xuejun [2 ]
机构
[1] Changzhou Univ, Sch Mech Engn & Rail Transit, Changzhou 213164, Peoples R China
[2] Chinese Acad Sci, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
[3] Jiangsu Prov Engn Res Ctr Intelligent Mfg Technol, Changzhou 213164, Peoples R China
来源
SYMMETRY-BASEL | 2024年 / 16卷 / 06期
关键词
droplet collision; hypergolic ignition; hydrogen peroxide; droplet vaporization; MEA; HEAD-ON COLLISION; COALESCENCE; SEPARATION;
D O I
10.3390/sym16060682
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Hypergolic ignition of H2O2 and MEA-NaBH4 by off-center collision of their droplets was experimentally studied, focusing on the characteristics and mechanism of droplet mixing, droplet heating and evaporation, and gas-phase ignition. The whole collision ignition process was divided into five stages, which were compared, respectively, with that of head-on collision. Under the condition of a slightly off-center collision (for cases where B < 0.35), H2O2 droplets penetrate MEA-NaBH4 droplets after the collision and coalesce with it, but the internal H2O2 drop inside the MEA-NaBH4 droplet does not form a stable sphere. Instead, it rotates and expands inside the mixed droplet. With B increasing to 0.59, the droplets no longer coalesce after collision but separate away, forming satellite droplets. In such cases, multi-ignition mode is observed. When B increases to a certain extent, specifically, 0.85, a grazing collision is observed such that no mass transfer exists during the interaction of droplets, which leads to ignition failure. A theoretical model quantifying droplet swelling rate was established to calculate the volume change of the droplet. It was found that the swelling can be attributed to the flash boiling of superheated internal H2O2 fluid. Meanwhile, the ignition delay time was found to linearly decrease with B at various Wes until the extent where the chemical reaction takes over control, leading to an almost constant time delay defined as RDT. Additionally, the regime of ignition modes corresponding to different droplet mixing features is summarized in the We-B parametric space.
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页数:15
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