Energies, Journal Year: 2025, Volume and Issue: 18(9), P. 2187 - 2187
Published: April 25, 2025
This study investigates the performance and combustion behavior of a spark ignition engine retrofitted to operate on compressed natural gas (CNG), with focus newly developed stratified charge pre-chamber design. The was modified include an auxiliary intake valve that enables partial enrichment mixture without need for dedicated fuel injector. hybrid approach combines mechanical simplicity passive systems enhanced control active pre-chambers. Both experimental tests computational fluid dynamics (CFD) analyses were carried out under load conditions (8 Nm) speeds ranging from 900 1700 rpm. results demonstrate improvements in indicated mean effective pressure (IMEP), stability, flame propagation speed—particularly at lower where effects are more pronounced. However, increasing speed resulted reduced volumetric efficiency elevated exhaust temperatures, indicating potential further optimization via turbocharging or advanced scavenging techniques. Overall, findings validate effectiveness proposed design enhancing thermal stability CNG-fueled engines, especially urban driving conditions.
Language: Английский