缸内直喷发动机燃油喷射压力对闪沸喷雾特性的影响研究

袁志远; 崔明利; 李雪松; 王森

doi:10.3969/j.issn.1001-2222.2020.05.002

车用发动机 >

2020 , Vol. 0 >Issue 5: 11 - 14

DOI: https://doi.org/10.3969/j.issn.1001-2222.2020.05.002

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缸内直喷发动机燃油喷射压力对闪沸喷雾特性的影响研究

袁志远 ,
崔明利 ,
李雪松 ,
王森

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（上海交通大学智能汽车研究所，上海 200240）

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Influence of Fuel Injection Pressure on Flash Boiling Spray Characteristics for GDI Engine

YUAN Zhiyuan ,
CUI Mingli ,
LI Xuesong ,
WANG Sen

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(Institute of Intelligent Vehicle,Shanghai Jiao Tong University,Shanghai 200240,China)

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摘要

闪沸喷雾可以在较低的喷射压力下有效提升燃油蒸发和雾化效率，为了研究喷射压力对闪沸喷雾破碎的具体影响及相关机理，基于一款单孔直喷喷油器，利用背光法完成了不同喷射压力和不同过热度下喷雾形态的高速成像试验。对比了喷射压力及过热度对喷雾形态及喷雾破碎的影响，并分析了不同工况下喷雾的破碎机理。研究表明：增加燃油过热度，单孔喷油器喷雾宽度显著增加，喷雾贯穿距明显缩短；对于冷态喷雾，增加燃油喷射压力，喷雾的贯穿距减小，喷雾宽度增加不明显；对于过热喷雾，增加燃油喷射压力，喷雾的宽度显著下降，贯穿距有所增加。

关键词： 过热度; 喷射压力; 贯穿距; 闪沸喷雾

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袁志远 , 崔明利 , 李雪松 , 王森 . 缸内直喷发动机燃油喷射压力对闪沸喷雾特性的影响研究[J]. 车用发动机, 2020 , 0(5) : 11 -14 . DOI: 10.3969/j.issn.1001-2222.2020.05.002

Abstract

Flash boiling spray can increase fuel evaporation and spray atomization efficiency effectively despite under the low injection pressure. However, in order to study the detailed influences of fuel injection pressure on the breakup process of flash boiling sprays and related mechanisms, the highspeed imaging experiments under different fuel injection pressures and overheat degrees were conducted by using the shadowgraph method on a single-hole fuel injector. Then the impacts of injection pressure and overheat degree on spray morphology and spray breakup were compared and the breakup mechanisms were also analyzed under different conditions. The research shows that the width of spray increases obviously and the penetration shortens remarkably after increasing the overheat degree of fuel. Besides, the spray penetration decreases and the spray width increases unobviously in the cooling spray and slightly increases and obviously reduces in the overheating spray.

Key words： overheat degree; injection pressure; penetration; flash boiling spray

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