MODELLING CHARACTERISTICS OF SPARK IGNITION ENGINE INJECTION SYSTEM

An experimental study is performed to investigate the combustion characteristics of an ethanol-gasoline, dual fueled, single cylinder spark ignition (SI) engine. A dual fuel injection system with both Direct-Injection (DI) and Port-Fuel-Injection (PFI) is used in this work. The performance of PFI-E85 and DI-gasoline, and PFI-gasoline and DI-E85 systems is presented. E85 is a blend of 85% ethanol and 15% gasoline by volume. In each test, the percentage of E85 is varied from 100 (0% gasoline) to 0 (100% gasoline) to compare the various cases. PFI-gasoline and DI-gasoline (PFI & DI-gasoline) results are also presented to provide a baseline for comparison. The cycle-to-cycle variability is presented using coefficient of variation (COV) of indicated mean effective pressure (IMEP). Mass fraction burned (MFB) and burn duration are determined from the analysis of measured in-cylinder pressure data. The well known Rassweiler and Withrow method (Model 1), with a new linear model for the polytropic index, is used to obtain the MFB curves. The differences are presented for the net pressure method (Model 2) to evaluate the burn rates. It is found that combustion is faster with the increase in PFI percentage for all the three setups with dual fuel injection. The PFI-E85 and DI-gasoline system showed that the burn duration decreases significantly with the increase in PFI percentage; however, the PFI-gasoline and DI-E85 system showed only slight differences with the increase in PFI percentage. Model 2 showed good agreement with Model 1 at high load conditions; however, it predicts slower combustion at light load conditions.

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A comprehensive numerical study of the ethanol blended fuel effect on the performance and pollutant emissions in spark-ignition engine

Thermal Science ◽

10.2298/tsci121005085z ◽

2014 ◽

Vol 18 (1) ◽

pp. 29-38 ◽

Cited By ~ 1

Author(s):

Motlagh Zangooee ◽

Razavi Modarres

Keyword(s):

Numerical Study ◽

Load Condition ◽

Engine Performance ◽

Spark Ignition ◽

Spark Ignition Engine ◽

Pollutant Emissions ◽

Injection System ◽

Thermodynamic State ◽

Point Injection ◽

Blended Fuel

In the present work, the performance and pollutant emissions in a spark ignition engine has been numerically investigated. For this purpose, the coupled KIVA code with CHEMKIN is used to predict the thermodynamic state of the cylinder charge during each cycle. Computations were carried out for a four cylinder, four strokes, multi point injection system (XU7 engine). Numerical cases have been performed up to 30% vol. of ethanol. Engine simulations are carried out at 2000, 2500 and 3000 rpm and full load condition. The numerical results showed that pollutant emissions reduce with increase in ethanol content. Based on engine performance, the most suitable fraction of ethanol in the blend was found to be nearly 15% for the XU7 engine.

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Effect of Water Vapor Injection on the Performance and Emissions Characteristics of a Spark-Ignition Engine

Sustainability ◽

10.3390/su13169229 ◽

2021 ◽

Vol 13 (16) ◽

pp. 9229

Author(s):

Ming-Hsien Hsueh ◽

Chao-Jung Lai ◽

Meng-Chang Hsieh ◽

Shi-Hao Wang ◽

Chia-Hsin Hsieh ◽

...

Keyword(s):

Air Pollution ◽

Water Vapor ◽

Internal Combustion Engines ◽

Spark Ignition ◽

Spark Ignition Engine ◽

Injection System ◽

Intake Manifold ◽

Exhaust Emission ◽

Engine Torque ◽

Vapor Injection

The exhaust emissions from Internal Combustion Engines (ICE) are currently one of the main sources of air pollution. This research presented a method for improving the exhaust gases and the performance of a Spark-Ignition (SI) engine using a water vapor injection system and a Non-Thermal Plasma (NTP) system. These two systems were installed on the intake manifold to investigate their effects on the engine’s performance and the characteristics of exhaust emission using different air/fuel (A/F) ratios and engine speeds. The temperatures of the injected water were adjusted to 5 and 25 °C, using a thermoelectric cooler (TEC) temperature control device. The total hydrocarbons (HC), nitrogen oxide (NOx), and engine torque were measured at different A/F ratios and engine speeds. The results indicated that the adaptation of the water vapor injection system and NTP system increased the content of the combustibles and combustion-supporting substances while achieving better emissions and torque. According to the test results, while the engine torque under 25 °C water+NTP was raised to 7.29%, the HC under 25 °C water+NTP and the NOx under 25 °C water were reduced to 16.31% and 11.88%, respectively. In conclusion, the water vapor injection and the NTP systems installed on the intake manifold could significantly reduce air pollution and improve engine performance for a more sustainable environment.

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