压电喷油器在低环境压力下的闪沸空心锥燃油喷射

Q3 Engineering
Zengyang Wu, Libing Wang, Tiegang Fang
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引用次数: 0

摘要

本文研究了在光学可及的定容腔中,由外开式压电喷射器在闪蒸条件下的喷射特性。在闪蒸喷雾状态下,喷淋结构明显,喷淋由空心锥状结构变形为菱形结构,在喷淋下游有一长中心羽流。羽流的液体信号比原来的空心锥形区域弱得多。较高的环境压力导致较短的中心羽流。由于喷雾结构的改变,喷雾穿透长度大大增加。喷油压力和喷油时间对喷雾前缘穿透长度影响较小。特别是,在0.01 bar时观察到的最高喷雾前缘穿透速度预计将接近当地声速。与异辛烷燃料相比,商品汽油由于沸腾范围较宽而产生更强的闪沸,但喷雾结构非常相似。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flash boiling hollow-cone fuel spray from a piezoelectric fuel injector under low ambient pressure
This study investigates the spray characteristics under flash boiling conditions from an outwardly opening piezoelectric injector in an optically accessible constant volume chamber. Distinct spray structure is noticed under flash boiling spray regime and spray deforms from a hollow-cone structure to a diamond-like shape with a long central plume at the downstream of the spray. Liquid signals of the plume are much weaker than the original hollow-cone shape region. A higher ambient pressure leads to a shorter central plume. Spray penetration length is greatly enlarged due to the change in spray structure. Fuel injection pressure and fuel injection duration has little effect on spray front penetration length. Especially, the highest spray front penetration velocity observed at 0.01 bar is expected to approach to the local sound speed. Compared to isooctane fuel, commercial gasoline generates stronger flash boiling due to the wide boiling range, but the spray structures are quite similar.
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来源期刊
International Journal of Powertrains
International Journal of Powertrains Engineering-Automotive Engineering
CiteScore
1.20
自引率
0.00%
发文量
25
期刊介绍: IJPT addresses novel scientific/technological results contributing to advancing powertrain technology, from components/subsystems to system integration/controls. Focus is primarily but not exclusively on ground vehicle applications. IJPT''s perspective is largely inspired by the fact that many innovations in powertrain advancement are only possible due to synergies between mechanical design, mechanisms, mechatronics, controls, networking system integration, etc. The science behind these is characterised by physical phenomena across the range of physics (multiphysics) and scale of motion (multiscale) governing the behaviour of components/subsystems.
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