Combustion and Emission Characteristics of SI Engines under Special Stroke/Bore Ratios
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Keywords:
Spark Ignition Engine, Cycle Model, Stroke To Bore Ratio, Combustion, EmissionsAbstract
Effects of stroke to bore ratio (rsb) on combustion and emission characters of spark
ignited (SI) engines are investigated numerically in this work. With the intention of achieving this
goal, two–zone quasi–dimensional cycle model for the SI engines was used, omitting detailed
computation of the fluid dynamics. Using empirical correlations, thermodynamic characteristics
during the suction and exhaust periods are estimated. SI cycle model’s turbulent flame entrainment
model was used to imitate the combustion phenomena, allowing for determination of combustion’s
properties, including temperature, cylinder pressure, burnt mass fraction, delay period, and duration.
To look into the emission characteristics of the SI engines, the cycle model was also used to
compute emissions for instance carbon monoxide (CO), nitrogen oxide (NO), and carbon dioxide
(CO2). Based on the study’s findings, the characteristics of combustion and emissions were
significantly impacted by adjusting the rsb ratio. With a rising rsb, the cylinder pressure and
temperature rose along with a reduced ignition delay and combustion duration. There was a
decrease of approximately 29.2% and 37.5% in the ignition delay and combustion time,
respectively, when the rsb rose from 0.7 to 1.3. Contrarily, CO and NO emissions dropped while
CO2 emissions remained mostly same as the stroke to bore ratio rose. When the rsb rose from 0.7 to
1.3, CO and NO emissions decreased by almost 41% and 52.8%, respectively.
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