Combined measurements of scattering and extinction coefficients in the UV-visible range have been used to characterize the particulate formed in an optically accessible divided-chamber diesel engine. Multi-wavelength spectroscopic analysis has shown the presence of two classes of particles: soot and organic aerosol. The latter structures absorb light radiation in the UV region and have sizes of 2-3 nm. They are present just after fuel ignition and their concentration suddenly increases as the combustion proceeds, reaching a maximum value well before the formation of soot particles. Soot particles are characterized by light absorption extending in the visible range and show sizes of about 10 mu in the first stages of the inception process. A detailed kinetic mechanism has been used to model the formation of both classes of particles in high-pressure conditions. The kinetic scheme, coupled to a simplified model of diesel combustion, has been able to correctly predict the total concentration and the size of the particulates. (C) 2002 Elsevier Science Ltd. All rights reserved.

Spectroscopic analysis and modeling of particulate formation in a diesel engine / B. M., Vaglieco; S. S., Merola; D'Anna, Andrea; D'Alessio, Antonio. - In: JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER. - ISSN 0022-4073. - STAMPA. - 73:(2002), pp. 443-450. [10.1016/S0022-4073(01)00227-8]

Spectroscopic analysis and modeling of particulate formation in a diesel engine

D'ANNA, ANDREA;D'ALESSIO, ANTONIO
2002

Abstract

Combined measurements of scattering and extinction coefficients in the UV-visible range have been used to characterize the particulate formed in an optically accessible divided-chamber diesel engine. Multi-wavelength spectroscopic analysis has shown the presence of two classes of particles: soot and organic aerosol. The latter structures absorb light radiation in the UV region and have sizes of 2-3 nm. They are present just after fuel ignition and their concentration suddenly increases as the combustion proceeds, reaching a maximum value well before the formation of soot particles. Soot particles are characterized by light absorption extending in the visible range and show sizes of about 10 mu in the first stages of the inception process. A detailed kinetic mechanism has been used to model the formation of both classes of particles in high-pressure conditions. The kinetic scheme, coupled to a simplified model of diesel combustion, has been able to correctly predict the total concentration and the size of the particulates. (C) 2002 Elsevier Science Ltd. All rights reserved.
2002
Spectroscopic analysis and modeling of particulate formation in a diesel engine / B. M., Vaglieco; S. S., Merola; D'Anna, Andrea; D'Alessio, Antonio. - In: JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER. - ISSN 0022-4073. - STAMPA. - 73:(2002), pp. 443-450. [10.1016/S0022-4073(01)00227-8]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/462781
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