The effects of intake backflow on in-cylinder situation and auto ignition in a gasoline controlled auto ignition engine

Nan Li, Hui Xie, Tao Chen, Le Li and Hua Zhao

Applied Energy, 2013, vol. 101, issue C, 756-764

Abstract: The inability to control the auto ignition in CAI combustion is an obstacle against its practical use, and the in-cylinder thermal and component distributions are being investigated in more depth as a way to control auto ignition. A 3D simulation using KIVA code is applied to study the effects of intake backflow on the in-cylinder situation. When the intake backflow is increased, the mean temperature is found to be significantly lower. In addition, the difference in the mean temperature of the cylinder reaches 40K at 320° CA ATDC for a 73–75.8% residual gas fraction. The in-cylinder temperature distribution becomes concentrative and the highest temperature in the cylinder decreases as the intake backflow increases. In this paper, the characteristics of the hot zone are studied, and the superposition ratio of the hot zone and the high residual gas fraction zone is proposed to represent the temperature and residual gas fraction of the mixture in the cylinder. The hot and relatively low residual gas fraction zone increases as the intake backflow increases. Experiments were performed on a single-cylinder engine with a variable valve system. Results indicated that the autoignition timing first delays and then advances as the intake backflow increases. The autoignition changes 3.7° CA at a 58.1–60.6% residual gas fraction. The intake backflow is a potential means of controlling auto ignition timing for CAI.

Keywords: Intake backflow; Distribution; Hot zone; Autoignition; CAI combustion (search for similar items in EconPapers)
Date: 2013
References: View complete reference list from CitEc
Citations: View citations in EconPapers (6)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261912005971
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:101:y:2013:i:c:p:756-764

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2012.07.050

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().