Spectroscopic analysis of the phases of premixed combustion in a compression ignition engine fuelled with diesel and ethanol

Mancaruso, Ezio; Vaglieco, Bianca Maria

doi:10.1016/j.apenergy.2015.01.031

Cited by 25 publications

(9 citation statements)

References 32 publications

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“…As literature demonstrates, engine-out soot emissions in conventional direct-injection diesel engines are the result of the balance between the soot formation and oxidation processes [22]. As such, the soot emissions reduction can be addressed by improving the mixture formation to prevent local overrich portions of in-cylinder mixture, or accelerating the oxidation of the formed soot by promoting high temperature conditions.…”

Section: In-cylinder Strategies For Soot Emissions Controlmentioning

confidence: 99%

“…Higher intake temperatures advance the start of combustion and vice versa. However, the range of crank angles over which the combustion phasing can be controlled is quite limited and a large penalty in volumetric efficiency accompanies the high intake temperatures [22]. Moreover, this method is generally deemed impractical for mobile applications.…”

Section: Charge Preparationmentioning

confidence: 99%

“…Thus, the study concluded that even if reasonable coating price can be found in the context of large volume production, no economic advantage is foreseen because of the increase in fuel consumption and pollutant emissions [21]. More recently, Toyota introduced the concept of "Temperature Swing Heat Insulation" [22]. This concept is based on coating the combustion chamber walls with a low-heat-conductivity and low-heat-capacity materials that can follow the transient gas temperature during the different strokes of the engine cycle.…”

Section: Thermal Barrier Coatingsmentioning

confidence: 99%

“…More recently, the pursuit of developing clean burning, high efficiency engines has motivated the use of ethanol in LTC concepts [20][21][22]. Ethanol was considered as potential fuel for this type of combustion due to its low reactivity, which was found to be the most suitable pathway to achieve the separation between the end of the main injection and the start combustion required in these combustion strategies [23,24].…”

Section: Low Temperature Combustion Conceptsmentioning

confidence: 99%

“…The model does not consider the possibility of fuel impinged in the wall. The instantaneous heat transfer coefficient between the gas and the different surfaces is based on Woschni [22] with some improvements detailed in Payri et al [23]. For the calculation of the different wall temperatures a nodal heat transfer model is implemented [24,25].…”

Section: -D Combustion Diagnosis Modelmentioning

confidence: 99%

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Dual-fuel compression ignition: towards clean, highly efficient combustion

Monsalve¹

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The more and more stringent emissions regulations, together with the greater fuel economy demanded by vehicle users, impose a clear objective to researchers and engine manufacturers: look for the maximum efficiency with the minimum pollutant emissions levels.The conventional diesel combustion is a highly efficient process, but also leads to high levels of NOx and soot emissions that require using aftertreatment systems to reduce the final levels released to the environment. Since these systems incur in higher costs of acquisition and operation of the engine, the scientific community is working on developing alternative strategies to reduce the generation of these pollutants during the combustion process itself.The literature shows that the new combustion modes based on promoting low temperatures during this process, offer high efficiency and very low NOx and soot levels simultaneously. However, after years of investigation, it can be concluded that these techniques cannot be applied in the whole engine operating range due to, among others, factors like the low control of the combustion process. In recent years, it has been demonstrated that the dual-fuel combustion technique allows to overcome this limitation thanks to the additional degree of freedom provided by the capacity of modulating the fuel reactivity depending on the engine operating conditions. This characteristic, together with the near-zero NOx and soot levels obtained with this technique, has encouraged the scientific community to deeply investigate the dual-fuel combustion. In this sense, former works confirm the advantages previously described, concluding that still exist some limitations to be tackled, as well as some margin for improving the potential of this combustion concept.The general objective of the present doctoral thesis is to contribute to the understanding of the dual-fuel combustion mode, with the particular aim of exploring different ways to improve its efficiency. For this purpose, it has been experimentally evaluated different options such as the modification of the engine operating parameters, specific designs of the piston geometry or the use of alternative fuels.With the aim of answering some of the questions found in the literature, the first part of each study has been dedicated to perform a detailed analysis of the influence of each particular strategy on the dual-fuel operation at low load. Later, it has been checked the ability of each option to extend the dual-fuel operating range towards higher engine loads. It is interesting to note that the analysis of some results has been supported by CFD calculations, which have allowed to understand some local phenomena occurring during the dual-fuel combustion process, which cannot be confirmed only from the experimental point of view.Finally, taking into account the knowledge acquired during the different studies performed, the last chapter of results has been devoted to evaluate the ability of the dual-fuel concept to operate over the whole engine map, as well as to iden...

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Section: In-cylinder Strategies For Soot Emissions Controlmentioning

confidence: 99%

Section: Charge Preparationmentioning

confidence: 99%