4.7 Review

Investigation research of gasoline direct injection on spray performance and combustion process for free piston linear generator with dual cylinder configuration

Journal

FUEL
Volume 288, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2020.119657

Keywords

Free piston linear generator (FPLG); Gasoline direct injection (GDI); Port fuel injection (PFI); Spray character; Cylinder combustion

Funding

  1. National Nature Science Foundation of China [51675043]

Ask authors/readers for more resources

The study investigated the spray characteristics and combustion process of FPLG by varying injection pressure, injection timing, and injection angle. The results showed that increasing injection timing improves mixture uniformity and combustion quality, while increasing injection pressure enhances fuel evaporation and mixture formation.
Gasoline direct injection (GDI) properties, including injection pressure (IP), injection timing (IT) and injection angle (IA), have critical impacts on the cycle to cycle combustion variation that directly determines the long term stable operation for free piston linear generator (FPLG) with dual cylinder configuration. Therefore, in this present paper, the spray characteristics and combustion process of FPLG were explored through 9 cases that were designed by adopting orthogonal experimental method at different IP, IT and IA. Furthermore, the spray numerical model at different IP were validated with the spray experiment rig. The results displayed that, when at IT130 degrees CA BTDC, the maximum cylinder pressure is 4.1 MPa and the mixture concentration is 0.98. However, at IT120 degrees CA BTDC, the maximum cylinder pressure is 3.6 MPa and the mixture concentration is 0.94. Meanwhile, at IT100 degrees CA BTDC, the maximum cylinder pressure only reaches 3 MPa and the mixture concentration is 0.86. The results indicated that the increase of IT can make the fuel take advantage of strong airflow movement, so as to improve the mixture uniformity. Thus, the combustion quality and power performance are enhanced. Moreover, at IP12MPa, when we define the maximum mixing uniformity as 1, the mixture uniformity reaches 0.98, 0.94 and 0.86 with IT130 degrees CA BTDC, 120 degrees CA BTDC, 100 degrees CA BTDC, correspondingly. It is much higher than IP15MPa and IP7MPa, individually. It is can be explained by the interaction of high IP that can make fuel evaporation to form a mixture, thus reducing the fuel evaporation with the increase of penetration distance. In addition, IA has no obvious influence on the mixture uniformity, but reasonable IA could improve combustion quality within a certain range.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available