Combustion characteristics of compression ignition engine operating on rapeseed oil-diesel fuel blends
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2019
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The effect of biofuels on the operational parameters of the combustion engines, such
as performance parameters or emission production, are monitored often. These changes are,
however, based on the effect of biofuels on the course of combustion pressure inside the
combustion chamber. The contribution deals with the effect of rapeseed oil-diesel fuel blends on
the combustion characteristics of turbocharged compression ignition engine. The course of
cylinder pressure was monitored and analysed and heat release rate was calculated. The brake
specific fuel consumption, indicated and brake thermal efficiency were calculated and evaluated,
in-cylinder temperature and ignition delay were also evaluated. As a test fuels a 5% and 20%
concentrations of rapeseed oil in diesel fuel were selected while 100% diesel fuel was used as a
reference. Turbocharged CI engine Zetor 1204 located in the tractor Zetor Forterra 8642 was used
for measurement. During measurement the rotation speed of the engine was kept constant at
approx. 1950 min-1
and the load of the engine was selected at approx. 20, 60, 80 and 100%. The
results showed decreased cylinder peak pressure, decreased intensity of heat release rate and
earlier end of combustion in all tested loads for both tested fuel blends in comparison with diesel
fuel, while the lowest peak cylinder pressure was reached using fuel with 5% rapeseed oil. Fuel
with 5% rapeseed oil also showed highest indicated efficiency. Ignition delay was found shorter
with both of the blended fuels in comparison with diesel fuel.
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biofuels, cylinder pressure, heat release rate, engine efficiency, articles