2021
DOI: 10.1051/e3sconf/202131207012
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Jet ignition in small two-stroke engines: an experimental survey on benefits and challenges

Abstract: Increasingly stringent policy on carbon dioxide have proved to be a severe constraint on the design of light two-stroke (2S) engines. The enhancement of efficiency is claimed to be the main target to make these devices compliant with future regulations. Low-Pressure Direct Injection (LPDI) was found to be effective in the reduction of fuel short circuit, thus improving efficiency and mitigating pollution. Innovative combustion technologies are required to exploit further the fuel potential. Jet Ignition (JI), … Show more

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Cited by 4 publications
(2 citation statements)
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“…This increase is aimed at enhancing volumetric efficiency while maintaining a 2 % CO level, consequently leading to a reduction in indicated efficiency and an increment in fuel consumption. As explained in [20] to achieve this enhanced efficiency, a delay in the ignition advance (IGA) is required. Such a delay, in turn, shifts the point of peak pressure away from the ideal timing, thus resulting in a reduction of the useful work provided by the piston and an increase in the temperature of exhaust gases.…”
Section: Resultsmentioning
confidence: 99%
“…This increase is aimed at enhancing volumetric efficiency while maintaining a 2 % CO level, consequently leading to a reduction in indicated efficiency and an increment in fuel consumption. As explained in [20] to achieve this enhanced efficiency, a delay in the ignition advance (IGA) is required. Such a delay, in turn, shifts the point of peak pressure away from the ideal timing, thus resulting in a reduction of the useful work provided by the piston and an increase in the temperature of exhaust gases.…”
Section: Resultsmentioning
confidence: 99%
“…In the more traditional case of slow natural gas engines for power generation, where the size of valves is not so relevant, the pre-chamber shape is usually stumpy [14] and can fit easily above the engine's head. Large and flattened shapes are also used in two-stroke engines, thanks to the absence of head valves [15,16]. Having a low height-to-diameter ratio, they seem to facilitate the scavenging process [17], especially when using multiple orifices.…”
Section: Introductionmentioning
confidence: 99%