Showing 6 results for Ethanol
S. K. Kamboj, M. N. Karimi,
Volume 3, Issue 2 (6-2013)
Abstract
Alcohols have been used as a fuel for engines since 19th century. Among the various alcohols, ethanol and
methanol are known as the most suited renewable, bio-based and ecofriendly fuel for spark-ignition (SI)
engines. The most attractive properties of ethanol and methanol as an SI engine fuel are that it can be
produced from renewable energy sources such as sugar, cane, cassava, many types of waste biomass
materials, corn and barley. In addition, ethanol has higher evaporation heat, octane number and
flammability temperature therefore it has positive influence on engine performance and reduces exhaust
emissions. In this study, the effects of unleaded iso-octane, unleaded iso-octane–ethanol blend (E10) and
isooctane-methanol blend (M10) on engine performance were investigated experimentally in a single
cylinder four-stroke spark-ignition engine. The tests were performed by varying the throttle position,
engine speed and loads. Three sets of observations were recorded at (1301 rpm, 16.8 Kg load), (1468 rpm,
15.8 Kg load) and (1544 rpm, 10 Kg load) for all tested fuels. The results of the engine test showed that IP,
IMEP, Volumetric efficiency and thermal efficiency was higher for the E10 fuel and BSFC was lower. In
general, most suited blend for SI engines has been specified as a blend of 10% ethanol. It was also observed
that better performance was recorded during second set of observation for all the tested fuels. It was also
found that ethanol–gasoline blends allow increasing compression ratio (CR) without knock occurrence.
M. Iranmanesh,
Volume 3, Issue 2 (6-2013)
Abstract
In this study, various percentage of DEE was added to the optimum selected ethanol-diesel blend (D-E10)
and optimized its blending ratio to overcome the poor ignition quality of ethanol when utilized in a single
cylinder DI diesel engine. Some physicochemical properties of test fuels such as heating value, viscosity,
and density and distillation profile were determined in accordance to the ASTM standards. The heating
value of the blends was reduced with addition of DEE. Front-end volatility of the blends was improved by
addition of DEE, which in turn improves the cold starting property. The uncertainty associated with
measurements was also measured. The data were analyzed statistically for 95% confidence level. The
results have shown that addition of biofuels, ethanol and diethyl ether, have improved the combustion and
emissions characteristics of the engine. Addition of ethanol and DEE improved smoke and NOx emissions
simultaneously. It was found the 8% DEE add to the D-E10 blend is the optimum combination based on the
performance and emission analysis with the exception of smoke opacity in which 15% DEE addition made
the lowest smoke opacity. At this optimum ratio the minimum peak heat release rate, the lowest NOx
emissions and the maximum BTE were occurred at full load condition. Meanwhile the lowest level of CO
and HC emissions were obtained at all the load conditions with the same blending ratio.
A. Elfasakhany,
Volume 4, Issue 1 (3-2014)
Abstract
The effects of unleaded gasoline and unleaded gasoline–ethanol blends on engine performance and pollutant emissions were investigated experimentally in a single cylinder, four-stroke spark-ignition engine with variable engine speeds (2600–3500 rpm). Four different blends on a volume basis were applied. These are E0 (0% ethanol + 100% unleaded gasoline), E3 (3% ethanol + 97% unleaded gasoline), E7 (7% ethanol + 93% unleaded gasoline) and E10 (10% ethanol + 90% unleaded gasoline). Results of the engine test indicated that using ethanol–gasoline blended fuels improve output torque, power, volumetric efficiency and fuel consumption of the engine it was also noted that fuel consumption depends on the engine speed rather than the ethanol content for ethanol less than 10% blended ratio. CO and unburned hydrocarbons emissions decrease dramatically as a result of the leaning effect caused by the ethanol addition CO2 emission increases because of the improved combustion.
S. Mohammadi, H. Rabbani, S. Jalali Honarmand3,
Volume 5, Issue 3 (9-2015)
Abstract
Among human activities, motor vehicles play the most important role in air pollution. Air pollution has negative impacts on people and on the environment. In this paper the effect of oxygen-enriched air (20.8%, 21.8%, 22.8%, 23.8% and 24.8%) and different bioethanol-gasoline blends (zero, 5%, 10%, 15%, 20% and 25%) in different engine speeds (1000 rpm, 2000 rpm and 3000 rpm) on the amount of pollutants, particles, and fuel consumption were studied. To do so, a four-cylinder, four-stroke gasoline engine with Siemens fueling system was used. The results showed that when oxygen percentage in the inlet increased from 20.8% to 24.8%, the average amount of UHC, CO, fuel consumption and the number of fine and coarse particles decreased 126.75%, 11.25%, 17.02%, 77.37% and 243.25%, respectively, while the amount of CO2 and NOX increased 5.36% and 113.27%, respectively. Also the results showed that when bioethanol percentage in the mixture increased from zero to 25%, the average amount of UHC, CO2, CO and the number of fine and coarse particles decreased 104.53%, 3.45%, 34.57%, 41.42% and 96.09%, respectively, while the amount of NOX and fuel consumption increased 163.41% and 15.75%, respectively.
Dr. Ali Mirmohammadi, Eng. Amin Kalhor,
Volume 9, Issue 4 (12-2019)
Abstract
According to the global air pollution Crisis, it seems necessary to finding a way for cars pollutions. The Combination of alcoholic fuels with gasoline is one of the methods to reduce pollutions. For optimizing engine performance, fuel availability, toxicity and political advantage, a blend of ethanol, methanol and gasoline is likely to be preferable to using any of these individual substances alone. So the purpose of this paper is studying methanol, ethanol and gasoline blend effect on engine emissions at different engine speed. The simulated model was validated in different RPMs of gasoline engine at full load condition. The effect of combined fuel injection in the simulated model was investigated and compared with the experimental results. The results of simulation have good agreement with experiments. The results show that by ethanol and methanol with gasoline blend CO and HC emissions are lower than gasoline mode, but the NOx and CO2 pollutants increases.
Dr Ali Qasemian, Mr Sina Jenabihaghparast, Mr Pouria Azarikhah,
Volume 12, Issue 3 (9-2022)
Abstract
In the current study, the hydrogen-addition influence on the performance of an SI engine using a gasoline-ethanol blend is investigated numerically. The simulation and validation of the model are carried out in order to evaluate the engine performance using conventional gasoline (G100) and the blend of gasoline and ethanol (G75E25). Furthermore, the hydrogen is added to the gasoline–ethanol blend (G50E25H25) to improve the engine thermal efficiency and reduce the amount of brake specific fuel consumption (BSFC) which leads to the reduction in greenhouse gas (GHG) emissions. The brake specific carbon dioxide (BSCO2) is also studied in this paper. Results show that the addition of hydrogen increases the brake power and thermal efficiency, moderates the BSFC, and decreases the maximum temperature of combustion chamber which reduces the production of greenhouse gases as well as BSCO2. In comparison with pure gasoline, by using G50E25H25, the maximum temperature of in-cylinder gas decreased by 12.55%, 10.82%, and 13.43% at 2000, 4000, and 6000 rpm, respectively. It is also evaluated that the lowest amount of BSCO2 is related to G50E25H25 in most of the engine speeds. The bio-fuel of G75E25 and pure gasoline are placed in next positions, respectively.
