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Numerical simulations were performed to better assess the effect of plasma produced ozone assisted combustion. The effects of ozone (O3) addition from 0 to 7000 ppm in the intake manifold on cylinder pressure history, ignition delay, cylinder temperature history, and formaldehyde unburned methanol emission of a direct injection spark ignition (DISI) methanol engine during cold start and steady state...
Numerical simulations were performed to assess the relationship between carbon monoxide (CO) and formaldehyde and unburned methanol-unregulated emissions in cylinders and a tailpipe with ozone (O3) addition from a direct-injection spark-ignition methanol engine. This simulation study was performed during cold-start and steady-state modes with O3 addition of 3000 and 7000 ppm. The initial phase of...
The effects of overall equivalence ratio, injection timing, and ignition timing on formaldehyde and unburned methanol emissions, cylinder temperature histories, and formaldehyde emission histories of a spark ignition direct injection stratified charge methanol engine during cold start and steady state conditions were simulated using computational fluid dynamics coupling the methanol chemical kinetics...
A non-uniform spray-line distribution nozzle was used to form a stratified charge distribution of methanol-air mixture in-cylinder. Computational fluid dynamics were employed to simulate the methanol chemical kinetics reaction mechanism. The effects of an overall methanol-air equivalence ratio on the mixture distribution of the in-cylinder, cylinder pressure, heat release rate, cylinder temperature,...
Experiments were conducted on a four-cylinder direct-injection spark-ignition (DISI) methanol engine under homogenous combustion mode and light load. The measurement methods in which combine with gas chromatography and liquid chromatography were used to separate and measure formaldehyde (HCHO) and unburned methanol unregulated emissions. The effects of methanol injection timing, ignition timing, excess...
The effect of injector configuration parameters on performance, combustion process and exhaust emissions characteristics from a direct injection spark ignition (DISI) methanol engine was investigated. The experimental results show that the brake thermal efficiency and maximum in-cylinder pressure of injector nozzle A are higher than those of injector nozzles B and C. The total hydrocarbon compounds...
The effects of injection and ignition timings, engine speed and load, compression ratio and injector configuration on cycle-by-cycle combustion variation in a direct-injection spark ignition (DISI) engine fueled with methanol have been studied experimentally. The coefficient of variation (COV) of the maximum in-cylinder pressure was used to evaluate the cycle-by-cycle combustion variation. The results...
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