This study discusses performance
and exhaust emissions from spark-ignition engine fueled
with ethanol–methanol–gasoline blends. The test results
obtained with the use of low content rates of ethanol–
methanol blends (3–10 vol.%) in gasoline were
compared to ethanol–gasoline blends, methanol–
gasoline blends and pure gasoline test results.
Combustion and emission characteristics of ethanol,
methanol and gasoline and their blends were evaluated.
Results showed that when the vehicle was fueled with
ethanol–methanol–gasoline blends, the concentrations
of CO and UHC (unburnt hydrocarbons) emissions
were significantly decreased, compared to the neat
gasoline. Methanol–gasoline blends presented the lowest
emissions of CO and UHC among all test fuels.
Ethanol–gasoline blends showed a moderate emission
level between the neat gasoline and ethanol–methanol–
gasoline blends, e.g., ethanol–gasoline blends presented
lower CO and UHC emissions than those of the neat
gasoline but higher emissions than those of the ethanol–
methanol–gasoline blends. In addition, the CO and
UHC decreased and CO2 increased when ethanol and/or
methanol contents increased in the fuel blends.
Furthermore, the effects of blended fuels on engine
performance were investigated and results showed that
methanol–gasoline blends presents the highest
volumetric efficiency and torque; ethanol–gasoline
blends provides the highest brake power, while ethanol–
methanol–gasoline blends showed a moderate level of
volumetric efficiency, torque and brake power between
both methanol–gasoline and ethanol–gasoline blends;
gasoline, on the other hand, showed the lowest
volumetric efficiency, torque and brake power among
all test fuels.nox depends on engine condition For
diesesel engine we take test on biodiesel ,diesel blend
,and butanol-diesel blend. Biodiesel has reduced
carbom monoxide emission but incressed NOx emission
Keywords : DI Diesel Engine, Spiral Manifold, Helical Manifold, Helical-SpiralCombined Manifold, Computational Fluid Dynamics (CFD).