Comparative study on alcohols–gasoline and gasoline–alcohols dual-fuel spark ignition (DFSI) combustion for high load extension and high fuel efficiency

Comparative study on alcohols–gasoline and gasoline–alcohols dual-fuel spark ignition (DFSI) combustion for high load extension and high fuel efficiency

Type	Journal Article
Author	Zhi Wang
Author	Hui Liu
URL	http://www.sciencedirect.com/science/article/pii/S0360544215000730
Volume	82
Pages	395-405
Publication	Energy
Date	March 15, 2015
Abstract	Describes a study of alcohols–gasoline and gasoline–alcohols dual-fuel spark ignition (DFSI) combustion for knock suppression and higher engine efficiency using a gasoline engine with high compression ratio. Researchers organized alcohols–gasoline DFSI using a port fuel injection (PFI) of high oxygenated, high latent heat of vaporization, and high octane alcohol fuel to suppress knock and a direct injection (DI) of high energy density and high volatility fuel to extend engine load. They organized gasoline–alcohols DFSI by gasoline PFI and alcohol DI. Their study encompassed three different alcohols, including methanol, ethanol, and hydro-ethanol. The engine was naturally aspirated and operated at stoichiometric condition. In each test, the percentage of alcohol injection was varied from 0 to 100%. The effects of these two combustion modes on knock-limit extension, fuel economy, and combustion characteristics were studied. Both alcohols–gasoline DFSI (dual-fuel spark ignition) and gasoline–alcohols DFSI are promising approaches for use of alternative alcohol fuels in practical gasoline engines with significant improvement in engine efficiency and knock suppression. Gasoline–alcohols DFSI exhibits better anti-knock performance and achieves higher fuel efficiency than alcohols–gasoline DFSI.