Discussion on Kantor Model for Cyclic Variation in Spark-ignition Engines
-
摘要: 为了对Kantor模型进行改进,提出了一个修正的Kantor模型.研究表明,在Kantor模型中忽略的定容放热过程和可变残余废气质量分数可以在很大程度上减小循环变动,然而在Kantor模型中未考虑的来自上一个循环的未燃燃油则明显使下一个循环的循环变动加剧,三者相互作用导致循环变动减弱甚至消失,在合理的参数范围内,没有循环变动出现,只有选取不合理的模型参数,循环变动方出现.即使是Kantor模型,循环变动也只出现在相当极端的模型参数的情况下.Abstract: Kantor proposed a spark ignition engine model to predict engine cyclic variation in terms of some assumptions. In this paper a modified Kantor model is proposed.We show that exhaust blowdown process and variable exhaust residual gas mass fraction, neglected in the Kantor model, significantly reduce cyclic variability. However, prior-cycle unburned fuel not considered in the Kantor model apparently aggravates cyclic variability of next cycle. These three factors interact each other and result in abatement and even disappearance of cyclic variation. No significant cyclic variability is predicted for realistic ranges of these parameters. Only for extremely unrealistic ranges of model parameters cyclic variation reluctantly shows up. Moreover, even using the Kantor model, cyclic variability is predicted only for rather extreme, somewhat contrived choices of the model parameters.
-
Keywords:
- cyclic variation /
- kantor model /
- modeling /
- spark-ignition engine
-
计量
- 文章访问数: 5
- HTML全文浏览量: 0
- PDF下载量: 4
下载:
