Abstract
Turbulent Jet Ignition systems are mainly dedicated to the combustion of lean mixtures of natural gas in heavy duty engines. The use of such a system in combination with lean mixtures leads to an increase in its overall efficiency. The article presents simulation analyzes of the impact of the excess air coefficient occurring in prechamber on the combustion process: combustion indicators and emission indicators. Tests on a single-cylinder engine with a displacement of about 4 dm3 at medium mixture (IMEP = 1.0 MPa) were carried out using the AVL Fire software. It was found that the incineration of global lean mixtures (lambda = 2) is effective when initiating this process (in the prechamber) with a charge of a stoichiometric composition. A strong relationship was found between the thermodynamic indicators in both prechamber and main chamber and the excess air coefficient initiating combustion.
Highlights
Turbulent Jet Ignition (TJI) systems are mainly used in engines running on lean mixtures
He pointed to the possibility of increasing the range of lean mixtures to = 2.5, while using hydrogen as fuel for the prechamber (PC); petrol was fed to the main chamber (MC)
Road tests in the Real Driving Emissions (RDE) test were presented by Roso et al [18] with the use of an engine with the PCIS (Pre Chamber Ignition System) with an air excess coefficient equal to = 1.4
Summary
Turbulent Jet Ignition (TJI) systems are mainly used in engines running on lean mixtures. The solutions of the TJI system analyzed by Attard [3, 4] obtained an indicated thermal efficiency of 42% when burning lean mixtures They find use mainly in large heavy duty (HD) engines [15]. Solutions for TJI systems were presented by Alvarez et al [1] He pointed to the possibility of increasing the range of lean mixtures to = 2.5, while using hydrogen as fuel for the prechamber (PC); petrol was fed to the main chamber (MC). Research on their possible applications in engines with small displacement is noted increasingly more often [4, 12, 17]. Similar scientific papers with the use of internal combustion engines with the TJI system in hybrid drives and Range Extender (REX) were published by Sens et al [19]
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