丙烷多孔闪沸GDI喷雾坍塌特性的实验研究  

Collapse of Propane Flash Boiling Spray From Multi-Hole GDI Injector

作　　者：郭恒杰[1] 李雁飞[1] 张周 马骁[1] 王志[1] 徐宏明[1] GUO Heng-Jie;LI Yan-Fei;ZHANG Zhou;MA Xiao;WANG Zhi;XU Hong-Ming(State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《工程热物理学报》2018年第11期2463-2468,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51636003)

摘　　要：本文研究了从五孔汽油直喷(GDI)喷嘴喷出的丙烷闪沸喷雾的坍塌特性。实验在定容弹内完成,背压为5～1100kPa,油温为30～90℃。结果表明,闪沸条件下喷雾的坍塌不是由高速射流运动导致;随着背压增加,坍塌程度呈现先减弱后增强的趋势,转折点位于101 kPa;当背压低于101 kPa时,喷雾内外部压差随着背压的减弱而降低,导致坍塌程度减弱;而当背压高于101 kPa时,蒸汽膨胀和冷凝受到抑制,导致坍塌程度减弱;当过热度较高时,喷雾坍塌程度随油温变化相对稳定。In this study, the collapse of propane flash boiling sprays discharged from a five-hole gasoline direct injection （GDI） injector was investigated. The tests were conducted in a constant volume vessel. The ambient pressure ranged from 5 kPa to 1100 kPa, and the fuel temperature varied from 30℃ to 90℃. The results indicate that the collapse of flash boiling sprays was not caused by the high-speed jet movement. The intensity of spray collapse increased first and then decreased as the ambient pressure increased from 5 kPa to 1100 kPa. The transitional pressure was around 101 kPa. At ambient pressures above 101 kPa, the expansion and condensation of vapor were limited, which caused the mitigation of spray collapse.

关 键 词：GDI 丙烷 喷雾坍塌 气泡生长 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]