20-03-2012, 03:52 PM
A Reduced Chemical Kinetic Model For The Analytical Investigations On The Oxidation Kinetics And Zero Dimensional Diesel Engine Performance Characteristics Of N-Heptane
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1. INTRODUCTION
Compression ignition engines are currently the most
efficient and practical power plant available for ground
transportation. They are superior to any other power
production device for the transportation sector in terms of
efficiency, torque and overall drive ability.
Recently the use of diesel engine has increased by virtue of
their low fuel consumption and high efficiencies. Diesel
engines are fuel-quality control engines. Unlike petrol
engines, the control of power in diesel engine comes through
the appropriate metering of the fuel quantity, whereas the air
consumption of the engine remains (within the limits of the
variation of the volumetric efficiency) almost constant. The
combustion process in diesel engines seriously affects engine
life. Compression ignition engines suffer from inferior
performance in terms of noise, particulate emissions and
exhaust emissions. The majority of particulates originate with
soot particles which are formed in fuel – rich regions of
burning diesel jets [1].
KINETIC MODELING
Kinetic modelling is the process by which the combustion
process can be formulated mathematically. It can be regarded
as a tool to analytically describe the complex process taking
place during the combustion process.
3.VALIDATION OF REACTION MECHANISM
The proposed reaction mechanism should be validated by
comparison with an experimental data or those from the
literature. Using the proposed reaction mechanism (767
reactions among 158 species) for n-heptane,
EMISSION CHARACTERISTICS
The perfect combustion would give in the exhaust only
CO2 and H2O (vapor). But such perfect combustion is never
obtainable. The tail pipe exhausts emission form a major
source of emissions. The imperfect combustion gives CO
which is a very poisonous gas and the deadliest pollutant. The
cause of CO formation is obviously the burning of fuel under
rich conditions. Carbon is first converted to CO and it is then
converted to CO2, provided sufficient oxygen is available.