Abstract
Renewable fuels like hydrogen and biodiesels can very well suit to diesel engine applications as they address problems of energy scarcity, foreign exchange savings and emission norms. Production of hydrogen and biodiesel to industrial scale with low cost techniques can pave way for their efficient use in engine applications. In view of this, an attempt has been made to operate a modified diesel engine on these high potential renewable fuel combinations. An experimental study was carried out to evaluate the performance, combustion and emission characteristics of diesel engine operated in dual fuel (DF) mode fuelled with esters of honne (EHNO), honge (EHO) oils and hydrogen induction. The study revealed that the brake thermal efficiency increased up to 20% hydrogen energy ratio (HER) and then it decreased. The emissions such as hydrocarbon (HC), Carbon monoxide (CO) and smoke decreased with HER while oxides of nitrogen (NOx) increased. The combustion parameters like peak pressure, ignition delay and heat release rate (HRR) increased with HER.
Highlights
Compression ignition engines are well known prime movers due to their higher BTE, as they are nowadays integral part of human life
The higher flame velocity of hydrogen improved mixing of liquid fuels injected with air and enhanced combustion rate that led to higher BTE and similar results were reported in the literature [16]
This could be due to a loss of fuel escaping through intake manifold as flow of hydrogen is continuous during the engine operation
Summary
Compression ignition engines are well known prime movers due to their higher BTE, as they are nowadays integral part of human life. H2 as an inducted fuel into the intake manifold fitted on the engine along with diesel as injected fuel into the cylinder in DF mode resulted in an increased BTE, reduction in HC, CO, CO2 emissions and volumetric efficiency [4]. Comparative results were given for various H2/diesel ratio, engine speeds and loads for neat diesel and DF operation, revealing the effect of DF combustion on engine performance and exhaust emissions. The researchers [14]-[16] studied the variation of H2-diesel quantity for constant diesel supply at different loads to improve the brake power and BTE and they found that increasing in the H2 flow rate in inlet manifold resulted reduction in the air flow to the engine cylinder by which volumetric efficiency and the BTE of the engine reduced
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