This study aims to examine the ignition pattern of CI engines run by nonedible mango seed biodiesel (MSBD). This work is also aimed to improve the ignition pattern of diesel engines by inducing hydrogen as a dual fuel in the intake manifold at various mass flow rates of 5 and 10 L per minute (lpm). Various parameters were calculated with varying intake hydrogen rates with MSBD and compared with diesel. Results concluded that the hydrogen supply at 10 lpm improved peak pressure by 3.22 bar, heat release rate (HRR) by 5.47 J/°C A, and brake thermal efficiency (BTE) by 3.4% of MSBD. Further, hydrogen supply also reduced overall HC by 0.36 g/ kWh, CO by 3.9 g/kWh, and smoke emission by 3.8 Bosch smoke unit (BSU) at all brake mean effective pressures (BMEPs) from neat MSBD with a 3.3 g/kWh increase in NO. Further, this research work reveals that hydrogen addition at 10 lpm with MSBD shall improve the ignition patterns of a diesel engine.
In
this work, palm oil biodiesel (POBD100) with a cyclo-octanol additive
was employed in a constant speed diesel engine, and its effects on
engine combustion, emission, and performance were studied. The biodiesel
produced from palm oil by the conventional transesterification process,
sodium hydroxide, and methanol were involved in the conversion of
oil into biodiesel. The five fuels evaluated were neat palm oil biodiesel
(POBD100), octanol blended with palm oil biodiesel by 10% volume (POBD90O10),
octanol blended with palm oil biodiesel by 20% volume (POBD80O20),
octanol blended with palm oil biodiesel by 30% volume (POBD70O30),
and petroleum diesel. The experimental results revealed that with
the increased octanol fraction, the combustion was smooth. All the
octanol and biodiesel blends provide earlier combustion when compared
to neat palm oil biodiesel which leads to higher thermal efficiency,
lower fuel consumption, lower peak pressure, and shorter ignition
delay. All the emissions are reduced by the addition of cyclo-octanol
in palm oil biodiesel in all loads owing to the higher oxygen concentration
of air/fuel mixtures and improved atomization. Based on the outcome
of this study, palm oil biodiesel and cyclo-octanol blends can be
employed as a potential alternative fuel for existing unmodified diesel
engines owing to its improved combustion, emission, and performance
characteristics.
This work examines the effect of butanol as an oxygenated additive to lower carbon monoxide, smoke, nitrogen oxide and hydrocarbon emissions and to improve the performance aspects of Calophyllum inophyllum (Punnai) biodiesel. Singlecylinder, oil-cooled compression ignition engines are employed in this work. Neat Punnai biodiesel (P100) is blended with butanol at 10% and 20% by volume and labelled as B10P90 and B20P80, respectively. Methanol and alkaline catalyst (KOH) were used for the transesterification process for biodiesel production. The transesterification technique yielded 88% biodiesel from raw Punnai oil. Engine tests resulted in lower CO, smoke, NO x and HC emissions when fuelled with both butanol blends when compared to P100. In addition, BSFC (brake-specific fuel consumption) reduced and BTE (brake thermal efficiency) increased with the inclusion of butanol blends (B10 and B20) to neat Punnai biodiesel.
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