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Impact of Spark Assistance and Multiple Injections on Gasoline PPC Light Load

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Impact of Spark Assistance and Multiple Injections on Gasoline PPC Light Load

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dc.contributor.author Benajes Calvo, Jesus Vicente es_ES
dc.contributor.author Tormos Martínez, Bernardo Vicente es_ES
dc.contributor.author García Martínez, Antonio es_ES
dc.contributor.author Monsalve Serrano, Javier es_ES
dc.date.accessioned 2017-03-13T12:39:05Z
dc.date.available 2017-03-13T12:39:05Z
dc.date.issued 2014-10
dc.identifier.issn 1946-3944
dc.identifier.uri http://hdl.handle.net/10251/78708
dc.description.abstract Along the last years, engine researchers are more and more focusing their efforts on the advanced low temperature combustion (LTC) concepts with the aim of achieving the stringent limits of the current emission legislations. In this regard, several studies based on highly premixed combustion concepts such as HCCI has been confirmed as a promising way to decrease drastically the most relevant CI diesel engine-out emissions, NOx and soot. However, the major HCCI drawbacks are the narrow load range, bounded by either misfiring (low load, low speed) or hardware limitations (higher load, higher speeds) and the combustion control (cycle-to-cylce control and combustion phasing). Although several techniques have been widely investigated in order to overcome these drawbacks, the high chemical reactivity of the diesel fuel remains as the main limitation for the combustion control. The attempts of the researchers to overcome these disadvantages are shifting to the use of fuels with different reactivity. In this sense, gasoline PPC has been able to reduce emissions and improve efficiency simultaneously, but some drawbacks regarding controllability and stability at low load operating conditions still need solution. In this field, previous researches have been demonstrate the multiple injection strategy as an appropriate technique to enhance the combustion stability. However, PPC combustion has been found limited to engine loads higher than 5 bar BMEP when using fuels with octane number greater than 90. In this regard, previous work from the authors showed the capability of the spark plug to provide combustion control in engine loads below this limit even using 98 ON gasoline. The main objective of the present work is to couple the control capability of the spark assistance together with an appropriate mixture distribution by using double injection strategies with the aim of evaluating performance and engine-out emissions at low load PPC range using a high octane number gasoline. For this purpose the optical and metal version of a compression ignition single-cylinder engine, to allow high compression ratio, has been used during the research. A common rail injection system enabling high injection pressures has been utilized to supply the 98 octane number gasoline. An analysis of the in-cylinder pressure signal derived parameters, hydroxyl radical (OH*) and natural luminosity images acquired from the transparent engine as well as a detailed analysis of the air/fuel mixing process by means of a 1-D in-house developed spray model (DICOM) has been conducted. Results from both analysis methods, suggest the spark assistance as a proper technique to improve the spatial and temporal control over the low load gasoline PPC combustion process. A noticeable increase in the cycle to cycle repeatability (5% versus 15.1% CoV IMEP at 2 bar load) as well as a reduction in the knocking level (20.5 versus 33.6 MW/m2 at 7 bar load) is observed. In addition, the combination of the spark assistance with the use of the double injection strategy provides a great improvement in terms of combustion efficiency (93% versus 88% for a single injection strategy) with a benefit around 18% in the IMEP es_ES
dc.language Inglés es_ES
dc.publisher SAE International es_ES
dc.relation.ispartof SAE International Journal of Engines es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Chemical analysis es_ES
dc.subject Diesel engines es_ES
dc.subject Diesel fuels es_ES
dc.subject Efficiency es_ES
dc.subject Engine cylinders es_ES
dc.subject Engines es_ES
dc.subject Fuels es_ES
dc.subject Gasoline es_ES
dc.subject Temperature Appropriate techniques es_ES
dc.subject Combustion efficiencies es_ES
dc.subject Common rail injection system es_ES
dc.subject High compression ratio es_ES
dc.subject High injection pressures es_ES
dc.subject High octane number gasoline es_ES
dc.subject Low temperature combustion es_ES
dc.subject Single cylinder engine es_ES
dc.subject.classification MAQUINAS Y MOTORES TERMICOS es_ES
dc.title Impact of Spark Assistance and Multiple Injections on Gasoline PPC Light Load es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.4271/2014-01-2669
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials es_ES
dc.contributor.affiliation Universitat Politècnica de València. Escuela Técnica Superior de Ingeniería del Diseño - Escola Tècnica Superior d'Enginyeria del Disseny es_ES
dc.description.bibliographicCitation Benajes Calvo, JV.; Tormos Martínez, BV.; García Martínez, A.; Monsalve Serrano, J. (2014). Impact of Spark Assistance and Multiple Injections on Gasoline PPC Light Load. SAE International Journal of Engines. 7(4):1875-1887. doi:10.4271/2014-01-2669 es_ES
dc.description.accrualMethod Senia es_ES
dc.relation.publisherversion http://dx.doi.org/10.4271/2014-01-2669 es_ES
dc.description.upvformatpinicio 1875 es_ES
dc.description.upvformatpfin 1887 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 7 es_ES
dc.description.issue 4 es_ES
dc.relation.senia 276882 es_ES


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