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Spray-combustion process characterization in a common rail diesel engine fuelled with butanol-diesel blends by conventional methods and optical diagnostics

Istituto Motori –CNR, Via G. Marconi 4 - 80125 Napoli, Italy

Special Issues: Bio-blended Fuels

The target of a sustainable mobility has led to investigate advanced combustion modes and fuels technologies. On the other side, the increasing global energy demand and the decreasing fossil-energy resources are enhancing the interest in the use of renewable alternative fuels for compression ignition engines with the target of near-zero emission levels. Although performance and emissions of alternative-fuel within light-duty diesel engines have been extensively investigated, results of fuel chemical composition impact on combustion by integrated optical methodologies are lacking. In order to meet this challenge, one of the main objectives of the research efforts is to characterize the combustion and species evolution. In this investigation, conventional tests and optical diagnostics were employed to enhance the comprehension of the combustion process and chemical markers in a common rail compression ignition engine powered by butanol-diesel blends. The investigation was focused on the effect of the injection strategy and blend composition on in-cylinder spray combustion and soot formation, through UV-visible digital imaging and natural emission spectroscopy. Experiments were performed in an optically accessible single cylinder high swirl compression ignition engine, equipped with a common rail multi-jets injection system. UV-visible emission spectroscopy was used to follow the evolution of the combustion process chemical markers. Spectral features of OH were identified and followed during the spray combustion process examining different pilot-main dwell timings. Soot spectral evidence in the visible wavelength range was correlated to soot engine out emissions. In this work, conventional and optical data related to diesel fuel blended with 40 % of n-butanol will be presented.
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Keywords Combustion; Common rail diesel engine; Butanol fuel; Diesel fuel; Optical diagnostics; Chemiluminescence

Citation: Simona Silvia Merola, Luca Marchitto, Cinzia Tornatore, Gerardo Valentino. Spray-combustion process characterization in a common rail diesel engine fuelled with butanol-diesel blends by conventional methods and optical diagnostics. AIMS Energy, 2014, 2(2): 116-132. doi: 10.3934/energy.2014.2.116

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Copyright Info: 2014, Simona Silvia Merola, et al., licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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