Influence of Engine Speed and Injection Phasing on Lean Combustion for Different Dilution Rates in an Optically Accessible Wall-Guided Spark Ignition Engine

2018 ◽  
Vol 11 (6) ◽  
pp. 1343-1369 ◽  
Author(s):  
Adrian Irimescu ◽  
Simona Merola ◽  
Santiago Martinez
Keyword(s):  
Engine Speed ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Lean Combustion

Comparative assessment of stoichiometric and lean combustion modes in boosted spark-ignition engine fueled with syngas

2021 ◽  
Vol 239 ◽  
pp. 114224
Author(s):  
Hyunwook Park ◽  
Junsun Lee ◽  
Narankhuu Jamsran ◽  
Seungmook Oh ◽  
Changup Kim ◽  
...  
Keyword(s):  
Spark Ignition ◽  
Comparative Assessment ◽  
Spark Ignition Engine ◽  
Lean Combustion ◽  
Combustion Modes

Lean-Combustion Spark-Ignition Engine Exhaust Aftertreatment Using Non Thermal Plasma

1998 ◽  
Author(s):  
G. Lepperhoff ◽  
K. Hentschel ◽  
P. Wolters ◽  
W. Neff ◽  
K. Pochner ◽  
...  
Keyword(s):  
Thermal Plasma ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Exhaust Aftertreatment ◽  
Engine Exhaust ◽  
Lean Combustion ◽  
Non Thermal Plasma

scholarly journals Efficiency characteristics of a new quasi-constant volume combustion spark ignition engine

2013 ◽  
Vol 17 (1) ◽  
pp. 119-133 ◽  
Author(s):  
Jovan Doric ◽  
Ivan Klinar
Keyword(s):  
Engine Speed ◽  
Combustion Process ◽  
Spark Ignition ◽  
Constant Volume ◽  
Spark Ignition Engine ◽  
Si Engine ◽  
Piston Mechanism ◽  
Si Engines ◽  
Ic Engines ◽  
Engine Concept

A zero dimensional model has been used to investigate the combustion performance of a four cylinder petrol engine with unconventional piston motion. The main feature of this new spark ignition (SI) engine concept is the realization of quasi-constant volume (QCV) during combustion process. Presented mechanism is designed to obtain a specific motion law which provides better fuel consumption of internal combustion (IC) engines. These advantages over standard engine are achieved through synthesis of unconventional piston mechanism. The numerical calculation was performed for several cases of different piston mechanism parameters, compression ratio and engine speed. Calculated efficiency and power diagrams are plotted and compared with performance of ordinary SI engine. The results show that combustion during quasi-constant volume has significant impact on improvement of efficiency. The main aim of this paper is to find a proper kinematics parameter of unconventional piston mechanism for most efficient heat addition in SI engines.

Reformed Hydrous-Ethanol Application in Spark Ignition Engine

2011 ◽  
Vol 84-85 ◽  
pp. 269-273
Author(s):  
Fu Bing You ◽  
Xin Tang Zhang ◽  
Zhi Xiang Pan ◽  
Ge Sheng Li
Keyword(s):  
Fossil Fuel ◽  
Gasoline Engine ◽  
Waste Heat ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Power Performance ◽  
Engine Exhaust ◽  
Rich Mixture ◽  
Lean Combustion ◽  
Hydrous Ethanol

Hydrous-ethanol is reformed to hydrogen-rich mixture gas which is an excellent fuel for engines. The advantages of this approach are that fossil fuel consumption and CO2 emissions are reduced, and the waste heat from engine exhaust can be used as energy source for hydrous-ethanol evaporating and reforming. The experiment is carried out on a gasoline engine as primary engine with only modest changes. The results indicate that the hydrogen-rich mixture gas allows operation at much higher compression ratio due to its intrinsic octane number which could contribute to the power performance, and the NOx, CO, THC emissions are reduced remarkably because of lean combustion realized in the cylinder.

Impacts of combustion phasing, load, and speed on soot formation in spark-ignition engines

2019 ◽  
Vol 21 (3) ◽  
pp. 514-539
Author(s):  
Mitchell D Hageman ◽  
David A Rothamer
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Residence Time ◽  
Engine Speed ◽  
Soot Formation ◽  
Direct Injection ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
The Impact

The premixed prevaporized engine operation method was used to study the effects of main combustion thermodynamic properties and residence time on soot formation in a spark-ignition engine. Select cases were repeated under early-injection, nearly homogeneous, spark-ignition direct-injection operation to determine if the impact of the investigated parameters was the same or if the impact of in-cylinder liquid fuel injection and the resulting heterogeneous fuel-air mixture alters the trends. The original premixed prevaporized study hypothesized that soot is more likely to form after main combustion than during the main combustion event under completely homogeneous conditions. This hypothesis was tested in this study by performing premixed prevaporized combustion phasing sweeps at equivalence ratios (Φs) of 1.35 and 1.40. Both sweeps showed low sensitivity of the particle size distribution to significant changes in peak temperature and pressure during combustion, providing supporting evidence for the original hypothesis. This information was then used to design experiments to isolate the impacts of pressure (engine load) and residence time (engine speed). A premixed prevaporized load sweep showed that particulate emissions increase as a function of load/pressure. A spark-ignition direct-injection load variation showed similar pressure dependence for cases with in-homogeneous in-cylinder fuel-air distributions. A premixed prevaporized residence time variation (performed by changing engine speed) demonstrated an increase in soot formation with increased residence time. The results for identical spark-ignition direct-injection residence-time variations suggest a trade-off in soot formation between the effects of increased mixing time and increased residence time for spark-ignition direct-injection operation. The premixed prevaporized load and speed points were each investigated using Φ sweeps to determine the critical enrichment threshold for soot formation (ΦC) and the dependence of soot formation for Φ > ΦC. The spark-ignition direct-injection investigations were performed at Φ = 0.98, such that any soot formation above the non-fuel-related baseline particle size distribution could be attributed either to mixture heterogeneity or in-cylinder fuel films.

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