Experimental Investigation of Diesel - Hydrogen Dual Fuel Direct Injection C.I. Engine with Exhaust Gas Recirculation

2015 ◽  
Vol 787 ◽  
pp. 697-701 ◽  
Author(s):  
R. Senthil Kumar ◽  
M. Loganathan
Keyword(s):  
Flow Rate ◽  
Combustion Engine ◽  
Direct Injection ◽  
Exhaust Gas Recirculation ◽  
Nox Emission ◽  
Exhaust Gas ◽  
Hydrogen Flow Rate ◽  
Hydrogen Flow ◽  
Inlet Manifold ◽  
Gas Recirculation

Hydrogen is a zero emission alternative gaseous fuel generally used in internal combustion engine with single fuel or duel fuel mode. In this work the Hydrogen is introduced in inlet manifold in addition to main diesel fuel used in the engine. The different flow rate of hydrogen fuel is used in this work are from 2 lpm to 10 lpm at 2 bar pressure. Here the single cylinder, direct injection, diesel engine with 1500 rpm rated speed is used for test. In addition to hydrogen, the exhaust gas also introduced in the inlet manifold with various percentages namely 10% and 20%. The engine is loaded with eddy current dynamometer .The engine performance and emissions of various combination of hydrogen flow rate and exhaust gas recirculation (EGR) were analyzed. The result showed that in 8 lpm hydrogen flow rate without EGR the BTE increased and BSFC decreased. At the same condition the HC, CO emissions reduced and NOx emission is increased. But NOx emission with 10% and 20% EGR is reduced.

Three-dimensional simulation analysis of the effect of hydrous ethanol and exhaust gas recirculation on gasoline direct injection engine combustion and emissions

2021 ◽  
pp. 1-22
Author(s):  
Xiuyong Shi ◽  
Yixiao Jiang ◽  
Qiwei Wang ◽  
Weiwei Qian ◽  
Rong Huang ◽  
...  
Keyword(s):  
Aqueous Ethanol ◽  
Direct Injection ◽  
Three Dimensional ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Engine Combustion ◽  
Carbon Soot ◽  
Dimensional Simulation ◽  
Gas Recirculation ◽  
Hydrous Ethanol

Abstract To analyze the influence of hydrous ethanol on the performance of the direct injection engine, the three-dimensional simulation is carried out by using CONVERGE software coupled with the combustion mechanism of hydrous ethanol gasoline and the soot model. The combustion and soot generation characteristics of a direct injection gasoline engine burning aqueous ethanol gasoline using exhaust gas recirculation (EGR) technology were investigated. It was found that the increase of the blending ratio of the hydrous ethanol can accelerate the flame propagation speed, shorten the combustion duration, and improve the combustion isovolume. The nucleation and growth of soot are jointly controlled by PAHs and the small molecular components such as C2H2. The oxygen content properties and high reactive OH of the aqueous ethanol-containing gasoline inhibit soot formation. Compared with pure gasoline, the carbon soot precursor mass was reduced by 60%, 54.5%, 73.3% and 52.4% for 20% anhydrous ethanol blended with gasoline, A1, A2, A3 and A4, respectively, and the carbon soot mass was reduced by 63.6% and the carbon soot volume density was reduced by 40%. The introduction of EGR exhaust reduces the burning rate and leads to an increase in the production of Carbon monoxide, hydrocarbon, and soot. However, the combination of EGR with aqueous ethanol gasoline can significantly improve the engine combustion environment, significantly reducing soot and PAHs concentrations. The impact of EGR also includes the ability to reduce combustion chamber temperatures and reduce NOx emissions from aqueous ethanol gasoline by 75%.

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