为了研究超高压喷射条件下二次破碎喷雾模型对燃油雾化特性的影响，在AVL FIRE软件平台上对燃油喷雾过程进行数值模拟，搭建可视化喷雾闪光摄影试验台架。基于超高的燃油喷射压力对燃油的雾束发展形态进行了图像采集，利用试验结果对二次破碎喷雾模型进行修正，分析模型中主要参数对燃油雾化特性的影响。结果表明：KH波破碎时间常数C2的减小有利于缩短喷雾贯穿距离，同时避免发生燃油撞壁现象；随着RT波波长常数C4的增大，二次破碎新生油滴的直径变大，雾化效果变差；由于首次破碎过程对二次破碎过程的制约作用，导致C4对喷雾计算结果的影响不像C2那样显著。
In order to study the influence of the twice breakup spray model on the atomization characteristics under the condition of super-high pressure injection, the fuel spraying process was simulated on the AVL FIRE software platform. The visual spray flash photography test bench was set up. The image acquisition of the spray development form of fuel was carried out. The twice breakup spray model was modified by the experimental results. The influence of main parameters on the atomization characteristics was analyzed. The results show that the decrease of KH wave breakup time constant C2 is conducive to shorten the spray penetration distance and avoid the fuel impinging wall phenomenon; With the increase of the RT wavelength constant C4, the diameter of the new oil drop of twice breakup becomes larger and the atomization effect becomes worse. Because of the restriction of the first breakup process to the second breakup process, the impact of C4 on the spray calculation results is not as significant as C2.
2016,38(9): 92-95,100 收稿日期：2015-11-5
DOI：10.3404/j.issn.1672-7619.2016.09.018
分类号：TK421
基金项目：国家自然科学基金资助项目（51379212）；国家自然科学基金青年资助项目（51409254）
作者简介：刘琦(1988-),男,博士,研究方向为动力机械及热力系统的设计、仿真与优化。
参考文献：
[1] 许建昌, 李孟良, 李锦, 等. 满足欧IV/V排放法规的柴油机排气后处理技术[J]. 现代车用动力, 2006(2): 12-16.XU Jian-chang, LI Meng-liang, LI Jin, et al. Study on diesel engine exhaust after-treatment technologies meeting euro IV/V standards[J]. Modern Vehicle Power, 2006(2): 12-16.
[2] SU W H, LIU B, WANG H, et al. Effects of multi-injection mode on diesel homogeneous charge compression ignition combustion[J]. Journal of Engineering for Gas Turbines and Power, 2007, 129(1): 230-238.
[3] 李煜晖, 崔可润, 朱国伟. 柴油机超高增压的电控技术[J]. 内燃机学报, 2002, 20(6): 541-545.LI Yu-hui, CUI Ke-run, ZHU Guo-wei. The electronic control technology on ultra-high supercharged diesel engine[J]. Transactions of CSICE, 2002, 20(6): 541-545.
[4] 王站成, 杜慧勇, 李焕. 柴油机喷雾模型的发展及应用[J]. 内燃机, 2009(5): 1-3.WANG Zhan-cheng, DU Hui-yong, LI Huan. Development and application of spray model of the diesel engine[J]. Internal Combustion Engines, 2009(5): 1-3.
[5] AVL-fire reference manual, version8.5[EB/OL].[2006-12-05]. http://www.avl.com.
[6] 李铁. 应用在柴油机喷雾测试研究中的计算机图像处理技术[D]. 大连: 大连理工大学, 2000.
[7] 孙柏刚, 张大鹏, 冯旺聪. 高压共轨燃油喷雾PIV测试方法及结果分析[J]. 北京理工大学学报, 2006, 26(7): 574-576.SUN Bai-gang, ZHANG Da-peng, FENG Wang-cong. Particle image velocimetry test methods for high pressure common rail spray and results of analysis[J]. Transactions of Beijing Institute of Technology, 2006, 26(7): 574-576.
[8] 黄康, 欧阳光耀, 安士杰, 等. 双层交错多孔喷嘴喷雾特性仿真与试验研究[J]. 汽车工程, 2015, 37(5): 506-509.HUANG Kang, OUYANG Guang-yao, AN Shi-jie, et al. Simulation and experimental study on the spray characteristics of double-row staggered multi-hole nozzle[J]. Automotive Engineering, 2015, 37(5): 506-509.
