Gasoline fuels properties for multi-mode operation – Observations in a GDI and the CFR engine

Shah, Ashish; Hoth, Alexander; Kolodziej, Christopher P.; Rockstroh, Toby

doi:10.1016/j.fuel.2020.119680

Cited by 9 publications

(1 citation statement)

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“…A single cylinder gasoline direct injection research engine was utilized for this study. A brief description of the configuration and details relevant to the present investigation is provided here, and the reader is referred to previous publications 18–21 for more details about the experimental facility. A schematic of single cylinder research engine detailing the pre-chamber fueling system is shown in Figure 1.…”

Section: Experimental Configurationmentioning

confidence: 99%

Investigations into EGR dilution tolerance in a pre-chamber ignited GDI engine

Rohwer

Han

Shah

et al. 2022

International Journal of Engine Research

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EGR is a useful means to improve fuel economy in spark-ignited gasoline engines, especially under part-load conditions by means of reducing throttling losses. There is also a significant reduction in NOx emissions due to the reduced peak cylinder temperatures. However, the ability of conventional spark ignition systems to reliably ignite dilute mixtures limits the dilution tolerance due to the onset of combustion instability. In this study, an active pre-chamber system was evaluated at part load condition with various EGR rates using a regular grade full boiling range gasoline. A premixed air-fuel mixture was supplied to the pre-chamber, which assists in scavenging the residual mass fractions to enable reliable ignition of EGR dilute mixtures in the main combustion chamber. A range of pre-chamber injection, air-fuel mixture formulation, and ignition timing strategies were evaluated during the EGR sweeps. In addition, 0-D and 1-D simulations were conducted in GT-Power to assess the thermodynamic state and composition in the pre-chamber, as well as estimate the jet momentum at the various dilution rates. The active pre-chamber extended the EGR dilution limit from 20% for conventional SI to above 30%, with a higher pre-chamber flow rate (more scavenging) resulting in increased combustion stability. A tradeoff between the jet momentum and spark timing was observed when analyzing the GT-Power simulations and the pre-chamber jet momentum was found to decrease with increasing EGR rate. At unstable high EGR operation, no relation could be found between the pre-chamber indicated data and main chamber combustion stability.

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Section: Experimental Configurationmentioning

confidence: 99%