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Experimental study on multi-point autoignition characteristics and influence factors of diesel spray in a controllable active thermo-atmosphere

查看全文 作　　者：DENG [1]Jun;WU [2]ZhiJun;HUANG [1]ChengJie;FENG [1]Wei;LI [2]LiGuang 高影响力作者 机构地区：[1]Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200030, China;[2]School of Automotive Studies, Tongji University, Shanghai 201804, China高影响力机构 出　　处：《Chinese Science Bulletin》索引2007年第52卷第2期,共7页高影响力期刊 基　　金：the National Key Basic Research Program of China (Grant No. 2001CB209201);the National Natural Science Foundation of China (Grant No. 50546014) 摘　　要：Auto-ignition characteristics of high-pressure diesel spray in the controllable active thermo-atmos-phere (CATA) were studied with a high-speed camera video system. Multi-point autoignition phe-nomenon of diesel spray in the CATA was observed and the influence factors of the autoignition were analyzed. The stabilization mechanisms of the spray flame in different coflow temperatures were also discussed. The stabilization of the flames was controlled by different factors: autoignition phenomenon in low coflow temperature and flame spread in high coflow temperature. The test results also show that the autoignition delay depends strongly on the coflow temperature and has nonlinear relationship with the temperature. Autoignition delay decreases by almost 10 ms from 16.9 to 7.1 ms when the coflow temperature increases from 996 to 1048 K and only 4 ms from 1048 to 1101 K. The injection parameters in terms of nozzle diameter, injection pressure and pump speed, have some effects on autoignition delay while these effects depend on the coflow temperature. The significant effect lies in low coflow temperature. The injection parameters influence the autoignition delay because it can shorten the physical delay by improving the spray quality and enlarging the spray angle or penetration rate to im-prove mixture quality. 关 键 词：柴油机 自燃现象 发动机 燃料
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