Spark-ignition engine

About: Spark-ignition engine is a research topic. Over the lifetime, 4352 publications have been published within this topic receiving 66550 citations.

Lean Combustion and Emission Characteristics of Bioethanol and Its Blends in a Spark Ignition (SI) Engine

Abstract: Lean combustion and exhaust emission characteristics in a spark ignition engine (SI engine) with variation of the ethanol–gasoline blending ratio and the excess air ratio were investigated in this research. To investigate the influence of the excess air ratio and ethanol blends, the lean combustion characteristics such as brake torque, cylinder pressure, and the rate of heat release (ROHR) were analyzed under the various excess-air ratios. In addition, the reduction effects of exhaust emissions such as carbon monoxide (CO), unburned hydrocarbon (HC), oxides of nitrogen (NOx), and carbon dioxide (CO2) were compared with those of gasoline fuel. The results showed that the peak combustion pressures and the ROHR of all test fuels linearly decreased as the excess air ratio (λ > 1.0) increased. As compared with gasoline fuel (G100) at each given excess air ratio, there were slight improvements in combustion pressure for ethanol blended fuels (E20–E100). The power output and brake mean effective pressure (BMEP) ...

Comparison of burning rates in a natural gas fuelled spark ignition engine

Abstract: A series of tests were conducted on a Toyota, 4-cylinder, spark ignition engine which was modified to run on either gasoline or natural gas. The aim of the experiment was to investigate the performance and combustion behaviour of natural gas, with particular emphasis on its low burning velocity. A pressure transducer installed in the cylinder head was used to obtain pressure vs. crank angle curves from which mass burn rates and burning velocities were calculated, using a heat release analysis program. Results indicate that the low laminar burning velocity of natural gas extends its ignition delay period (time to 1% burned) by up to 100% compared with gasoline. This contrast with the remainder of the combustion period which is dominated by turbulence effects that produce very similar burning velocities for the two fuels.

Operating Limits for Ammonia Fuel Spark-Ignition Engine

Abstract: The objective of this paper is to provide new data about the possibility of using ammonia as a carbon-free fuel in a spark-ignition engine. A current GDI PSA engine (Compression Ratio 10.5:1) was chosen in order to update the results available in the literature mainly obtained in the CFR engine. Particular attention was paid to determine the lowest possible load limit when the engine is supplied with pure ammonia or a small amount of H2, depending on engine speed, in order to highlight the limitation during cold start conditions. It can be concluded that this engine can run stably in most of these operating conditions with less than 10% H2 (of the total fuel volume) added to NH3. Measurements of exhaust pollutants, and in particular NOx, have made it possible to evaluate the possibility of diluting the intake gases and its limitation during combustion with pure H2 under slightly supercharged conditions. In conclusion, the 10% dilution limit allows a reduction of up to 40% in NOx while guaranteeing stable operation.