Experimental study on the effect of nozzle geometry on string cavitation in real-size optical diesel nozzles and spray characteristics

被引:70
作者
Chen, Zhou [1 ]
He, Zhixia [2 ]
Shang, Weiwei [1 ]
Duan, Lian [2 ]
Zhou, Han [1 ]
Guo, Genmiao [1 ]
Guan, Wei [1 ]
机构
[1] Jiangsu Univ, Sch Energy & Power Engn, Zhenjiang 212013, Peoples R China
[2] Jiangsu Univ, Inst Energy Res, Zhenjiang 212013, Peoples R China
基金
中国国家自然科学基金;
关键词
Diesel injector nozzle; Visualization experiment; String cavitation; Nozzle geometry; Spray characteristics; FLOW CHARACTERISTICS; INJECTOR NOZZLES; DIFFERENT FUELS; ENGINE; COMBUSTION; PARAMETERS; PRESSURE; IGNITION; BLENDS; LENGTH;
D O I
10.1016/j.fuel.2018.05.132
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Cavitation is quite important for the diesel spray atomization and the combustion of air-fuel mixture. In this study, a high-speed CMOS camera equipped with a long-distance microscope was utilized to capture the transient cavitating flow and spray characteristics in real-size optical nozzles with needle motion. The transient cavitation images, including geometry-induced cavitation and vortex-induced string cavitation, were captured clearly in cylindrical-orifice nozzles and tapered-orifice nozzles, respectively. Besides, the agglomerated phenomenon of geometry-induced cavitation was visually captured and analyzed for the first time. It was found that the string cavitation in nozzle excites the instability of spray cone angle and it is synchronized with increase of spray cone angle. In addition, it is the string cavitation but not geometry-induced cavitation has a much larger contribution to the increase of spray cone angle. It is interesting that the influence of agglomerated geometryinduced cavitation on spray cone angle was prominent. Furthermore, both the nozzle orifice L/D ratio and sac types have significant influences on string cavitation and spray characteristics. The smaller L/D ratio and VCO-type nozzles are prone to incur the stronger string cavitation, and then spray cone angle is obviously larger.
引用
收藏
页码:562 / 571
页数:10
相关论文
共 36 条
[1]   Vortex flow and cavitation in diesel injector nozzles [J].
Andriotis, A. ;
Gavaises, M. ;
Arcoumanis, C. .
JOURNAL OF FLUID MECHANICS, 2008, 610 :195-215
[2]  
[Anonymous], SAE INT J ENGINES
[3]  
[Anonymous], 2002, SAE T
[4]   Investigation of cavitation in real size diesel injection nozzles [J].
Badock, C ;
Wirth, R ;
Fath, A ;
Leipertz, A .
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 1999, 20 (05) :538-544
[5]   Microscopic imaging of the initial stage of diesel spray formation [J].
Crua, Cyril ;
Heikal, Morgan R. ;
Gold, Martin R. .
FUEL, 2015, 157 :140-150
[6]   Initial dynamic development of fuel spray analyzed by ultra high speed imaging [J].
Ding, Haichun ;
Wang, Ziman ;
Li, Yanfei ;
Xu, Hongming ;
Zuo, Chengji .
FUEL, 2016, 169 :99-110
[7]   Characterization of string cavitation in large-scale Diesel nozzles with tapered holes [J].
Gavaises, M. ;
Andriotis, A. ;
Papoulias, D. ;
Mitroglou, N. ;
Theodorakakos, A. .
PHYSICS OF FLUIDS, 2009, 21 (05)
[8]  
Hayashi T., 2012, AUTOMIZATION J ILASS, V21, P92
[9]   Visual experiment of transient cavitating flow characteristics in the real-size diesel injector nozzle [J].
He, Zhixia ;
Zhang, Zhengyang ;
Guo, Genmiao ;
Wang, Qian ;
Leng, Xianying ;
Sun, Shenxin .
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 2016, 78 :13-20
[10]   Experimental study of cavitating flow inside vertical multi-hole nozzles with different length-diameter ratios using diesel and biodiesel [J].
He, Zhixia ;
Shao, Zhuang ;
Wang, Qian ;
Zhong, Wenjun ;
Tao, Xicheng .
EXPERIMENTAL THERMAL AND FLUID SCIENCE, 2015, 60 :252-262