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Keywords: one-dimensional engine modelling, three-dimensional engine modelling, noise and pollutants control.

Summary

Performance and environmental impact (in terms of noxious emissions and radiated noise) of a six-cylinder turbocharged diesel engine, equipped with a common rail fuel injection system are reproduced by means of computational fluid dynamics and acoustic numerical tools. These are properly assessed on the ground of data collected during an experimental campaign covering a broad range of engine working conditions.

The comprehensive characterization of the engine behaviour is realised according to the following hierarchical approach:

The engine is tested under different speeds and loads. Global performance and emission data are collected, together with the combustion-related noise emission.
A one-dimensional model is generated to characterize the flow in the intake and exhaust systems and to predict the engine-turbocharger matching conditions; a short-route exhaust gas recirculation (EGR) circuit is activated to control the EGR level; the opening ratio of the variable-geometry turbine is managed to control the boost level.
One-dimensional computed in-cylinder pressure, temperature and composition at the inlet valve closure (IVC) are utilized as an initial condition for the subsequent closed-valve analysis performed by means of a properly developed three-dimensional model.
The three-dimensional model allows an estimate of the mixture formation and combustion development. It is also used to predict the amount of NO, PM, HC and CO produced.
One or three-dimensional computed pressure cycles are finally post-processed by means of a in-house developed acoustic tool to estimate the related noise emission.
Both one, three-dimensional and acoustic tools are validated on the ground of experimental data.

The one-dimensional model proves to be highly effective in reproducing the matching of the engine with the turbocharger group, whereas the three-dimensional model is conceived in such a way to exhibit a good portability as the load conditions are varied.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 94 PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY Edited by: Paper 49 Modeling of the Combustion Process in a Common Rail Diesel Engine for the Prediction of Noxious Emissions and Radiated Noise M. Costa¹, D. Siano¹ and F. Bozza² ¹Istituto Motori, CNR, Napoli, Italy ²DIME, University of Napoli "Federico II", Italy doi:10.4203/ccp.94.49 purchase the full-text of this paper Full Bibliographic Reference for this paper M. Costa, D. Siano, F. Bozza, "Modeling of the Combustion Process in a Common Rail Diesel Engine for the Prediction of Noxious Emissions and Radiated Noise", in , (Editors), "Proceedings of the Seventh International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 49, 2010. doi:10.4203/ccp.94.49 Keywords: one-dimensional engine modelling, three-dimensional engine modelling, noise and pollutants control. Summary Performance and environmental impact (in terms of noxious emissions and radiated noise) of a six-cylinder turbocharged diesel engine, equipped with a common rail fuel injection system are reproduced by means of computational fluid dynamics and acoustic numerical tools. These are properly assessed on the ground of data collected during an experimental campaign covering a broad range of engine working conditions. The comprehensive characterization of the engine behaviour is realised according to the following hierarchical approach: The engine is tested under different speeds and loads. Global performance and emission data are collected, together with the combustion-related noise emission. A one-dimensional model is generated to characterize the flow in the intake and exhaust systems and to predict the engine-turbocharger matching conditions; a short-route exhaust gas recirculation (EGR) circuit is activated to control the EGR level; the opening ratio of the variable-geometry turbine is managed to control the boost level. One-dimensional computed in-cylinder pressure, temperature and composition at the inlet valve closure (IVC) are utilized as an initial condition for the subsequent closed-valve analysis performed by means of a properly developed three-dimensional model. The three-dimensional model allows an estimate of the mixture formation and combustion development. It is also used to predict the amount of NO, PM, HC and CO produced. One or three-dimensional computed pressure cycles are finally post-processed by means of a in-house developed acoustic tool to estimate the related noise emission. Both one, three-dimensional and acoustic tools are validated on the ground of experimental data. The one-dimensional model proves to be highly effective in reproducing the matching of the engine with the turbocharger group, whereas the three-dimensional model is conceived in such a way to exhibit a good portability as the load conditions are varied. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £125 +P&P)
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