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Experimental Evaluation of Pilot and Main Injection Strategies on Gasoline Compression Ignition Engine—Part 1: Combustion Characteristics
- Avinash Kumar Agarwal - Indian Institute of Technology Kanpur, Engine Research Laboratory, Department of Mechanical Engineering, India ,
- Vishnu Singh Solanki - Indian Institute of Technology Kanpur, Engine Research Laboratory, Department of Mechanical Engineering, India ,
- M. Krishnamoorthi - Indian Institute of Technology Kanpur, Engine Research Laboratory, Department of Mechanical Engineering, India
Journal Article
03-16-06-0046
ISSN: 1946-3936, e-ISSN: 1946-3944
Sector:
Topic:
Citation:
Agarwal, A., Solanki, V., and Krishnamoorthi, M., "Experimental Evaluation of Pilot and Main Injection Strategies on Gasoline Compression Ignition Engine—Part 1: Combustion Characteristics," SAE Int. J. Engines 16(6):809-832, 2023, https://doi.org/10.4271/03-16-06-0046.
Language:
English
Abstract:
Climate change and stringent emission regulations have become major challenges
for the automotive sector, prompting researchers to investigate advanced
combustion technologies. Gasoline compression ignition (GCI) technology has
emerged as a potential solution, delivering higher brake thermal efficiency with
ultra-low nitrogen oxides (NOx) and particulate emissions. Combustion stability
and controls are some of the significant challenges associated with GCI. This
study investigates the combustion characteristics of a two-cylinder diesel
engine in GCI mode. GCI experiments were performed using a low-octane fuel
prepared by blending 80% (v/v) gasoline and 20% (v/v) diesel (G80). Baseline
experiments were conducted in conventional diesel combustion (CDC) mode. These
experiments investigated the effects of double pilot injection, first pilot fuel
ratio, and the start of main fuel injection timing (10–8°CA before top dead
center, bTDC). The results indicated that the GCI mode produced significantly
lower (~10%) in-cylinder pressure than the CDC mode. Higher pilot fuel
proportions exhibited a lower heat release rate (HRR) at low loads. Retarded
main injection showed a lower heat release in the premixed combustion phase than
the advanced main injection case at all loads. In addition, retarded main
injection timing showed retarded start of combustion (SoC) and end of combustion
(EoC). GCI mode exhibited higher cyclic variations than baseline CDC mode, which
need to be addressed.