Yingying Lu , Yi Qian , Daochen Zhang , Yufeng Chen , Yiqiang Pei
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引用次数: 0
摘要
实验结合数值模拟研究了前腔容积比(PVR)和喷油质量比(PFR)对重负荷柴油机前腔射流扰动燃烧系统的性能和排放的影响。通过参数优化,得出结论:在压缩冲程期间,前腔内的漩涡可使燃料夹带更多空气,从而使燃烧更充分,减少废气排放;燃烧初期形成的喷射火焰与主燃烧喷流碰撞,促进火焰向四周发展,从而加剧了对周围流场的扰动,提高了指示热效率(ITEg)(减碳);在燃烧后期,喷射动能从预室持续进入主室,使附着在主室壁上的油被剥离到气缸中,然后混合燃烧,有助于提高 ITEg,进一步减少烟尘和 CO 排放。研究发现,与原柴油机相比,通过增加前置室并优化前置室参数(优化 PVR/PFR 为 3%/2%),性能和排放特性都得到了改善:ITEg 提高了 6.41%,氮氧化物、烟尘和 CO 排放分别减少了 2.8%、44.4% 和 46.3%。
Parameters optimization of prechamber jet disturbance combustion system—Effect of prechamber volume and fuel injection mass ratios on performance and exhausts in a diesel engine
Experiment combined with numerical simulation were used to investigate influences of prechamber volume ratio (PVR) and fuel injection mass ratio (PFR) on performance and emissions of a prechamber jet disturbance combustion system in a diesel engine at heavy load. By parameter optimization, the conclusions revealed that, during the compression stroke, the swirl inside the prechamber can make the fuel entrain more air, leading to more complete burn and reduced exhausts; the jet flame formed during early combustion period collides with the main combustion spray, promoting the flame to develop around, which intensifies the disturbance to the surrounding flow field, improving the indicated thermal efficiency (ITEg) (carbon reduction); during late combustion period, the jet kinetic energy continued into the main chamber from the prechamber causes the oil attached to the wall of the main chamber to be peeled off into the cylinder and then mix and burn, helping increase the ITEg, and further decrease the soot and CO emissions. It was found that, compared with the original diesel engine, by adding a prechamber and optimizing the prechamber parameters (the optimized PVR/PFR is 3 %/2 %), the performance and emissions characteristics are improved: the ITEg is improved by 6.41 %, the NOx, soot and CO exhausts are deceased by 2.8 %, 44.4 % and 46.3 %, respectively.
期刊介绍:
The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.