High swirl-inducing piston bowls in small diesel engines for emission reduction

Prasad, BVVSU and Sharma, CS and Anand, TNC and Ravikrishna, RV (2011) High swirl-inducing piston bowls in small diesel engines for emission reduction. In: Applied Energy, 88 (7). pp. 2355-2367.

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Abstract

Detailed three-dimensional CFD simulations involving flow and combustion chemistry are used to study the effect of swirl induced by re-entrant piston bowl geometries on pollutant emissions from a single-cylinder diesel engine. The baseline engine configuration consists of a hemispherical piston bowl and an injector with finite sac volume. The first iteration involved using a torroidal, slightly re-entrant bowl geometry, and a sac-less injector. Pollutant emission measurements indicated a reduction in emissions with this modification. Simulations on both configurations were then conducted to understand the effect of the changes. The simulation results indicate that the selected piston bowl geometry could actually be reducing the in-cylinder swirl and turbulence and the emission reduction may be entirely due to the introduction of the sac-less injector. In-cylinder air motion was then studied in a number of combustion chamber geometries, and a geometry which produced the highest in-cylinder swirl and Turbulence Kinetic Energy (TKE) around the compression top dead centre (TDC) was identified. The optimal nature of this re-entrant piston bowl geometry is confirmed by detailed combustion simulations and emission predictions. (C) 2010 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	Applied Energy
Publisher:	Elsevier science
Additional Information:	Copyright of this article belongs to Elsevier science.
Keywords:	Diesel engine emissions;Swirl;Combustion;Computational Fluid Dynamics (CFD);Piston bowl;Injector sac volume
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	02 May 2011 05:40
Last Modified:	02 May 2011 05:40
URI:	http://eprints.iisc.ac.in/id/eprint/37400

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