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Effect of injection strategy on the combustion and exhaust emission characteristics of a biodiesel-ethanol blend in a DI diesel engine / Seung Hyun Yoon in Transactions of the ASME . Journal of engineering for gas turbines and power, Vol. 132 N° 9 (Septembre 2010) 

Public ISBD [article]  in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 132 N° 9 (Septembre 2010) . - 03 p. Titre : Effect of injection strategy on the combustion and exhaust emission characteristics of a biodiesel-ethanol blend in a DI diesel engine Type de document : texte imprimé Auteurs : Seung Hyun Yoon, Auteur ; Jin Woo Hwang, Auteur ; Chang Sik Lee, Auteur Année de publication : 2011 Article en page(s) : 03 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Air  pollution  control  Biofuel  Combustion  Diesel  engines  Exhaust  systems  Ignition Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : An experimental investigation was performed on the effect of injection strategy on the combustion, exhaust emission characteristics and the particle size distribution in a small direct-injection (DI) compression ignition engine fueled with a biodiesel-ethanol blended fuel. The results obtained from the experiment of the particle distributions for the blended fuel are compared with that of diesel fuel. In addition to the distribution of the particles, exhaust emissions, such as oxides of nitrogen (NOx), hydrocarbon (HC), and carbon monoxide (CO) emissions, and combustion characteristics under different injection parameters were investigated. The injection parameters in terms of first injection mass and second injection mass were varied to investigate the combustion and emission reduction in the biodiesel and ethanol blended fuel. The results show that the first combustion and heat release generated from the first injection, and then the second injected fuel rapidly combusted with an extremely short ignition delay. The maximum combustion pressures and heat releases of a biodiesel-ethanol blend are generally higher than those of the ultra-low sulfur diesel (ULSD) in all cases, regardless if an equal quantity of fuel is injected. The soot and NOx emissions for a blend are relatively lower than the ULSD at all test ranges. In addition, HC and CO emissions for a blend also indicated relatively low levels compared with those of the ULSD. Double injection cases for biodiesel-ethanol blend, the number concentrations of larger size particles which are closely related to the weight of smoke emissions mass were significantly reduced. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...] [article] Effect of injection strategy on the combustion and exhaust emission characteristics of a biodiesel-ethanol blend in a DI diesel engine [texte imprimé] / Seung Hyun Yoon, Auteur ; Jin Woo Hwang, Auteur ; Chang Sik Lee, Auteur . - 2011 . - 03 p. Génie Mécanique Langues : Anglais (eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 132 N° 9 (Septembre 2010) . - 03 p. Mots-clés : Air  pollution  control  Biofuel  Combustion  Diesel  engines  Exhaust  systems  Ignition Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : An experimental investigation was performed on the effect of injection strategy on the combustion, exhaust emission characteristics and the particle size distribution in a small direct-injection (DI) compression ignition engine fueled with a biodiesel-ethanol blended fuel. The results obtained from the experiment of the particle distributions for the blended fuel are compared with that of diesel fuel. In addition to the distribution of the particles, exhaust emissions, such as oxides of nitrogen (NOx), hydrocarbon (HC), and carbon monoxide (CO) emissions, and combustion characteristics under different injection parameters were investigated. The injection parameters in terms of first injection mass and second injection mass were varied to investigate the combustion and emission reduction in the biodiesel and ethanol blended fuel. The results show that the first combustion and heat release generated from the first injection, and then the second injected fuel rapidly combusted with an extremely short ignition delay. The maximum combustion pressures and heat releases of a biodiesel-ethanol blend are generally higher than those of the ultra-low sulfur diesel (ULSD) in all cases, regardless if an equal quantity of fuel is injected. The soot and NOx emissions for a blend are relatively lower than the ULSD at all test ranges. In addition, HC and CO emissions for a blend also indicated relatively low levels compared with those of the ULSD. Double injection cases for biodiesel-ethanol blend, the number concentrations of larger size particles which are closely related to the weight of smoke emissions mass were significantly reduced. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...]

Impact of orifice angle configurations on the droplet atomization enhancement of diesel fuel in a group-hole nozzle / Hyun Kyu Suh in Transactions of the ASME . Journal of engineering for gas turbines and power, Vol. 133 N° 11 (Novembre 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 11 (Novembre 2011) . - 07 p. Titre : Impact of orifice angle configurations on the droplet atomization enhancement of diesel fuel in a group-hole nozzle Type de document : texte imprimé Auteurs : Hyun Kyu Suh, Auteur ; Chang Sik Lee, Auteur Année de publication : 2012 Article en page(s) : 07 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Diesel  engines  Dissociation  Drops  Nozzles  Orifices  (mechanical)  Petroleum  Sprays Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : This paper presents the effect of orifice configuration on the droplet atomization characteristics of diesel fuel injected through different types of group-hole nozzle angles, which are converged (theta=−3 deg), parallel (theta=0 deg), and diverged (theta=+3 deg) orifices in atmospheric pressure and room temperature condition (0.1 MPa, 293 K). It was revealed that the parallel hole nozzle has the largest Sauter mean diameter (SMD) value and both sprays from diverged and converged hole nozzles show better atomization. A comparison of spray tip penetration illustrates that as the orifice angle is converged, spray tip penetration becomes longer, and it must be the reason for the fast spray velocity. These results can confirm the relationship among time, distance, and velocity. Therefore, it can be concluded that the droplet atomization enhancement can be expected in the converged nozzle spray rather than in the parallel and diverged nozzle sprays based on the results of smaller SMD, faster velocity, better air utilization, and higher percentage of small size of droplets in the measuring area. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...] [article] Impact of orifice angle configurations on the droplet atomization enhancement of diesel fuel in a group-hole nozzle [texte imprimé] / Hyun Kyu Suh, Auteur ; Chang Sik Lee, Auteur . - 2012 . - 07 p. Génie Mécanique Langues : Anglais (eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 11 (Novembre 2011) . - 07 p. Mots-clés : Diesel  engines  Dissociation  Drops  Nozzles  Orifices  (mechanical)  Petroleum  Sprays Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : This paper presents the effect of orifice configuration on the droplet atomization characteristics of diesel fuel injected through different types of group-hole nozzle angles, which are converged (theta=−3 deg), parallel (theta=0 deg), and diverged (theta=+3 deg) orifices in atmospheric pressure and room temperature condition (0.1 MPa, 293 K). It was revealed that the parallel hole nozzle has the largest Sauter mean diameter (SMD) value and both sprays from diverged and converged hole nozzles show better atomization. A comparison of spray tip penetration illustrates that as the orifice angle is converged, spray tip penetration becomes longer, and it must be the reason for the fast spray velocity. These results can confirm the relationship among time, distance, and velocity. Therefore, it can be concluded that the droplet atomization enhancement can be expected in the converged nozzle spray rather than in the parallel and diverged nozzle sprays based on the results of smaller SMD, faster velocity, better air utilization, and higher percentage of small size of droplets in the measuring area. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...]