Thermo-kinetic modelling of variable valve timing effects on HCCI engine combustion
Journal Title: International Journal of Automotive Engineering and Technologies - Year 2015, Vol 4, Issue 1
Abstract
In this study the effects of variable valve timing on the combustion of a Homogeneous Charge Compression Ignition (HCCI) engine have been analysed using a new modelling approach for HCCI engine cycle. A novel sequential modelling platform is developed using a combination of detailed multi-zone thermo-kinetic combustion model, 1D intake flow model and exhaust gas flow model. The new model utilizes CHEMKIN-PRO and GT-POWER software along with in-house exhaust gas flow model. Experimental data from a single-cylinder HCCI engine is used to validate the model. Validation results show that the model can predict combustion phasing and Indicated Mean Effective Pressure (IMEP) with average errors of 1.1 crank angle degrees (CAD) and 0.3 bar, respectively. The experimentally validated model is then used to investigate the effects of intake valve timing on HCCI auto-ignition radicals, zonal temperature, combustion phasing, IMEP, and exhaust emissions.
Authors and Affiliations
Mohammadreza Nazemi*| Michigan Technological University, Department of Mechanical Engineering-Engineering Mechanics Houghton MI, USA, Hrishikesh Saigaonkar| Michigan Technological University, Department of Mechanical Engineering-Engineering Mechanics Houghton MI, USA, Mahdi Shahbakhti| Michigan Technological University, Department of Mechanical Engineering-Engineering Mechanics Houghton MI, USA
Keywords
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Thermo-kinetic modelling of variable valve timing effects on HCCI engine combustion
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