Article: Multidimensional modelling of diesel combustion by a detailed kinetic scheme and comparison with in-cylinder optical measurements Journal: International Journal of Vehicle Design (IJVD) 2007 Vol.45 No.1/2 pp.100 - 127 Abstract: The present work aims at a comprehensive study of diesel combustion based on detailed kinetic modelling and experimental investigations performed on an optically accessible engine. A diesel fuel surrogate model of combustion is included in a three-dimensional CFD code properly designed for application to internal combustion engines. The fuel spray is treated by discrete droplet models tuned on the ground of measurements of penetration lengths effected in a vessel at controlled conditions. The detailed chemistry of the turbulent reacting flow is computed by means of the partially stirred reactor approximation, which leads to an appreciable computational economy. Test-bench experimental data allow the code validation and the assessment of its predictability as operating conditions are modified. Optical measurements clarify major physical and chemical aspects related to fuel autoignition and combustion evolution. The proposed approach is believed to be valuable in optimising performances of diesel engines equipped with Common Rail (CR) injection systems. Inderscience Publishers - linking academia, business and industry through research

Title: Multidimensional modelling of diesel combustion by a detailed kinetic scheme and comparison with in-cylinder optical measurements

Authors: Felice E. Corcione, Michela Costa, Bianca M. Vaglieco, Hiroshi Omote

Addresses: Istituto Motori, Consiglio Nazionale delle Ricerche, Viale Marconi, 8, Naples 80125, Italy. ' Istituto Motori, Consiglio Nazionale delle Ricerche, Viale Marconi, 8, Naples 80125, Italy. ' Istituto Motori, Consiglio Nazionale delle Ricerche, Viale Marconi, 8, Naples 80125, Italy. ' Yanmar Co., Ltd., 1600-4 Umegahara, Maihara Shiga 521-8511, Japan

Abstract: The present work aims at a comprehensive study of diesel combustion based on detailed kinetic modelling and experimental investigations performed on an optically accessible engine. A diesel fuel surrogate model of combustion is included in a three-dimensional CFD code properly designed for application to internal combustion engines. The fuel spray is treated by discrete droplet models tuned on the ground of measurements of penetration lengths effected in a vessel at controlled conditions. The detailed chemistry of the turbulent reacting flow is computed by means of the partially stirred reactor approximation, which leads to an appreciable computational economy. Test-bench experimental data allow the code validation and the assessment of its predictability as operating conditions are modified. Optical measurements clarify major physical and chemical aspects related to fuel autoignition and combustion evolution. The proposed approach is believed to be valuable in optimising performances of diesel engines equipped with Common Rail (CR) injection systems.

Keywords: detailed kinetic modelling; combustion; common rail injection; diesel engines; CR injection; vehicle design; NO_x emissions; soot formation; CFD; computational fluid dynamics; fuel spray; turbulent reacting flow; optical measurement; fuel autoignition.

DOI: 10.1504/IJVD.2007.013673

International Journal of Vehicle Design, 2007 Vol.45 No.1/2, pp.100 - 127

Published online: 11 May 2007 *

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Title: Multidimensional modelling of diesel combustion by a detailed kinetic scheme and comparison with in-cylinder optical measurements

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