Understanding Loss Mechanisms and Identifying Areas of Improvement for HCCI Engines Using Detailed Exergy Analysis

Saxena, Samveg; Bedoya, Iván D.; Shah, Nihar; Phadke, Amol

doi:10.1115/1.4024589

Cited by 26 publications

(4 citation statements)

References 20 publications

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“…The model highlights that these trends can be related to the different loss mechanisms in the engine. Prior studies suggested that partial combustion events and the heat lost to the walls are the main loss mechanisms. − Model results show that in the operating conditions located in the middle of the operating map for PRF100 (lambda = 3, EGR = 30%), about 38% of the total heat from the combustion chamber is exchanged with the piston head, while 62% is lost to the cylinder walls and head. The relatively small contribution of cylinder walls is because the heat losses mainly take place at a Crank Angle Degree (CAD) close to the TDC, since the gas temperature is close to the maximum value.…”

Section: Fuel Effects On Hcci Operability Mapsmentioning

confidence: 97%

A Model Investigation of Fuel and Operating Regime Impact on Homogeneous Charge Compression Ignition Engine Performance

et al. 2018

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The aim of this paper is to investigate the fundamental role of chemical kinetics on the performance maps of homogeneous charge compression ignition (HCCI) engines in terms of operability limits, engine efficiency, and emissions. The work focuses on a Ricardo E6 engine, highlighting the impact of different fuels (PRF80, PRF100, and ethanol) on ringing, misfire, and partial burn limits, as well as on several performance variables and pollutant emissions. The operability maps are calculated assuming proper criteria to identify the limits of the map in terms of ringing, misfire, and partial burn. Sensitivity analysis and rate of production analysis highlight the role of H2O2 in sustaining the combustion of ethanol at high exhaust gas recirculation (EGR) and air dilution with respect to PRF100 and PRF80 mixtures. The multizone model confirms that thermal stratification and crevices are the main factors responsible for the emissions of CO and unburned species. NOx are produced mainly via a thermal mechanism. Interaction of N2O with H and O radicals also plays a role, while a prompt mechanism does not significantly affect NOx emissions. Ethanol shows greater flexibility, lower pollutant emissions, and wider operability conditions with respect to engines fed with primary reference fuels. The paper highlights the potential of this multizone model in reproducing the engine performance. Nonreacting Computational Fluid Dynamics (CFD) simulations are first used to estimate heat and mass transfer coefficients. Then, the proposed model does not require further empirical or tuning parameters. Only the thresholds defining the operability maps are derived from the experiments and are the same for all the fuels and operating conditions investigated. The extensive comparison with a large set of experimental data shows the capability of the model to describe the effect of fuel composition and EGR the operability map, highlighting how such a tool can play an important role in understanding the chemistry controlling fuel reactivity and pollutant emissions in the different conditions. These information can support not only fuel and engine operation selection, but also their optimal design. As an example, the effects of boost and engine speed on the HCCI combustion are critically investigated, in terms of the extension of the operability region, engine thermal efficiency, and exhaust emissions.

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Section: Fuel Effects On Hcci Operability Mapsmentioning

confidence: 97%

A Model Investigation of Fuel and Operating Regime Impact on Homogeneous Charge Compression Ignition Engine Performance

et al. 2018

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“…Estudios relacionados con la cinética química en procesos que involucran sustancias combustibles que han sido estudiados por investigadores en Colombia Descripción Referencia Análisis teórico (S. Gómez et al, 2013) Técnicas ab initio (Calderón et al, 2015;Juan F. Espinal et al, 2004, 2007Jimenez-Orozco et al, 2018;A. Montoya et al, 2000;Alejandro Montoya et al, 2001, 2002a, 2002bPalacio et al, 2018;Sanchez et al, 2019;Vélez et al, 2009) Mecanismos para uso en combustión (Quiceno et al, 2002) Mecanismos para uso en equipos de craqueo de fracciones de petróleo (López-Pérez, 2016) Sistemas de combustión complejos (Alvarado et al, 2009;Amador et al, 2017;Burbano et al, 2011b;Cardona Vargas & Amell-Arrieta Andrés Adolfo Arrieta Carlos, 2016;Saxena et al, 2013;Yepes & Amell, 2013) Combustibles líquidos (Padilla et al, 2017b) Combustibles sólidos (Rojas et al, 2012) Tabla 9S. Investigaciones relacionadas con la combustión realizadas por investigadores colombianos Descripción Referencia Relación con características de Colombia: altura sobre el nivel del mar (presión atmosférica), humedad y composición química de combustibles en aplicaciones relacionadas con aplicaciones industriales de la combustión (Andrés A.…”

Section: Koreaunclassified

Hacia una estructura de investigación y educación para la prevención de accidentes por incendios y explosiones en Colombianción de accidentes por incendios y explosiones en Colombia

Molina

López

Escobar

et al. 2021

Rev. Acad. Colomb. Cienc. Ex. Fis. Nat.

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Se analizó la situación actual de la investigación y la educación en incendios y explosiones en Colombia desde un enfoque de ciencia e ingeniería y se hicieron recomendaciones sobre los campos que deben desarrollarse para crear una estructura investigativa y educativa que respalde los esfuerzos por prevenirlos. Dado el riesgo de incendios y explosiones, la mayoría de los países han propiciado la creación de centros de investigación y educación orientados al desarrollo científico en esta área. En Colombia tal infraestructura tiene un desarrollo apenas incipiente. La revisión de aspectos importantes en incendios y explosiones como el análisis estadístico, la caracterización fisicoquímica de sustancias inflamables, la cinética química, la combustión, la simulación, la radiación térmica, los fenómenos de pirólisis, el smouldering, la formación de hollín y de humo, la caracterización experimental, la evaluación de riesgos, la educación y otros aspectos específicos de las explosiones evidenció que en Colombia existe un buen desarrollo en la aplicación de la combustión y la pirólisis con fines comerciales, pero sin énfasis en incendios y explosiones. En las demás áreas existen antecedentes de investigación específicamente relacionados con este campo que deben reforzarse. Se recomienda la creación de programas curriculares de posgrado en ciencia y tecnología en esta área, así como el aumento de la capacidad experimental para la caracterización de sustancias inflamables, el fortalecimiento de la investigación en ciencias básicas y el desarrollo de habilidades de computación y simulación.

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“…A commonly preferred methodology combining first and second laws of thermodynamics for evaluation of thermal systems is known as exergy analysis (Moran and Sciubba, 1994;Dincer and Cengel, 2001;Tsatsaronis, 2007). However, numerous papers on exergy analysis of different systems have been presented to the literature after appreciation of the exergy analysis (Zhang and Lior, 2004;Saxena et al, 2013;Zhao et al, 2016a;Zhao et al, 2016b;Akbulut et al, 2016;Cakici et al, 2017;Salpingidou et al, 2018;Caglayan and Caliskan, 2018;Calli et al, 2019;S öhret et al, 2019). Regarding working principle of aircraft gas turbine engines, performance evaluation of them in terms of exergy has always drawn attention of researchers (Arntz et al, 2015;S öhret et al, 2016;Hayes et al, 2017;Dong et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Exergy analysis of a three-spool turboprop engine during the flight of a cargo aircraft

Dinç

Şöhret

Ekici

2020

AEAT

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Purpose This study aims to introduce exergy analysis of a three-spool turboprop engine during the complete flight. Design/methodology/approach In this study, a flight scenario of the aircraft is assumed. Operating parameters of the aircraft and its engine are modelled based on the assumed flight scenario with the aid of a genuine code. And then performance analysis of the engine is performed for each flight path point with the aid of exergy. Findings At the end of the study, major exergy parameters of the engine are calculated during the complete flight of a cargo aircraft three-spool turboprop engine. Practical implications Findings of the study may be beneficial for industry and practitioners to improve performance of the evaluated engine. Originality/value To the best of authors’ knowledge, this paper presented the exergy analysis of a three-spool turboprop engine during the complete flight for the first time. It was shown how the exergy destruction rate depends on the altitude and manoeuvre.

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Understanding Loss Mechanisms and Identifying Areas of Improvement for HCCI Engines Using Detailed Exergy Analysis

Cited by 26 publications

References 20 publications

A Model Investigation of Fuel and Operating Regime Impact on Homogeneous Charge Compression Ignition Engine Performance

A Model Investigation of Fuel and Operating Regime Impact on Homogeneous Charge Compression Ignition Engine Performance

Hacia una estructura de investigación y educación para la prevención de accidentes por incendios y explosiones en Colombianción de accidentes por incendios y explosiones en Colombia

Exergy analysis of a three-spool turboprop engine during the flight of a cargo aircraft

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