Numerical investigation of a porous media combustor in a small-scale diesel engine

Subhasish Das, Biplab Kumar Debnath, Rajat Subhra Das, Alessandro Stagni and Tiziano Faravelli

Energy, 2019, vol. 186, issue C

Abstract: The application of porous media in compression ignition engines has significant effects on its combustion behavior. In this work, a Computational Fluid Dynamics (CFD) analysis of combustion in diesel engine is performed for 100% load, and the effects of porous media addition in the combustion chamber are quantified. With a porosity of 66.7%, silicon carbide is applied as porous media of cylindrical shape in the modified piston bowl in the conventional engine. The combustion analysis outputs include average cylinder-pressure, temperature; Nitrogen Oxides (NOX), mean mixture fraction, turbulent kinetic energy, total energy and modified Peclet number. The results of the CFD study for the cases of non-porous media are validated against the performed baseline experimental analysis, whereas porous media predictions are compared to the state-of-the-art studies available in the literature. In presence of porous media, the average peak pressure and temperature are found to drop by ∼26 bar and ∼550 K, respectively, as compared to that of non-porous media. Furthermore, NOX emissions are significantly reduced up to 97%. The generation of turbulent kinetic energy is enhanced by 86% for PM leading to an increment of ∼36% in the thermal energy conversion than without a porous media.

Keywords: Diesel engine; Porous media; Nitrogen oxides; Heat recuperation; Energy conservation; Energy efficiency (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:186:y:2019:i:c:s0360544219314562

DOI: 10.1016/j.energy.2019.07.115

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