Abstract
The article contains a thermodynamic analysis of a new combustion system that allows the combustion of stratified gas mixtures with mean air excess coefficient in the range 1.4-1.8. Spark ignition was used in the pre-chamber that has been mounted in the engine cylinder head and contained a rich mixture out of which a turbulent flow of ignited mixture is ejected. It allows spark-jet ignition and the turbulent combustion of the lean mixture in the main combustion chamber. This resulted in a two-stage combustion system for lean mixtures. The experimental study has been conducted using a single-cylinder test engine with a geometric compression ratio e = 15.5 adapted for natural gas supply. The tests were performed at engine speed n = 2000 rpm under stationary engine load when the engine operating parameters and toxic compounds emissions have been recorded. Analysis of the results allowed to conclude that the evaluated combustion system offers large flexibility in the initiation of charge ignition through an appropriate control of the fuel quantities supplied into the pre-chamber and into the main combustion chamber. The research concluded with determining the charge ignition criterion for a suitably divided total fuel dose fed to the cylinder.
Highlights
Urbanization and industrialization have led to a sharp increase in transportation demand worldwide
Fuel dose inflammability investigation using a new combustion system, such as a single-fuel gas powered engine equipped with a prechamber and a main chamber, has been carried out
The most preferred initial dose inflammability range irrespective of the main dose is observed for doses ranging from 1-2 mg/inj; in this range Coefficient of Variation (CoV) (IMEP) reaches values up to 3%;
Summary
Urbanization and industrialization have led to a sharp increase in transportation demand worldwide. Full engine optimization resulted in the specific fuel consumption being reduced to 200 g/kWh for gas fuelled engine compared to the 240 g/kWh during a conventional gasoline direct injection test. Tests of a prechamber system coupled to the main chamber intended for use in engines of PC or LDV vehicles was presented by Attard et al [17] In this injection system, both indirect gas injectors (into the intake manifold) and direct gas injectors (to the prechamber) were used. Additional simulation studies conducted in [23] demonstrate that the air/fuel ratio of 1/1.09 achieves the lowest combustion time, with a 5.7% variation of the maximum combustion pressure This confirms the hypothesis that the maximum laminar flame velocity in methane combustion is within the air excess coefficient range of = 1/1.05 to 1/1.10 [24]. The temperature value in the vicinity of this phenomenon was estimated to be at the level of 2400-2500 K
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