Investigation of diesel engine for low exhaust emissions with different combustion chambers

• Main Authors: Ghodke Pundlik R., Suryawanshi Jiwak G.
• Format: Article
• Language: English
• Published: VINCA Institute of Nuclear Sciences 2015-01-01
• Series: Thermal Science
• Subjects: piston bowl geometry; spray angle; spray hitting plane; emission
• Online Access: http://www.doiserbia.nb.rs/img/doi/0354-9836/2015/0354-98361500176G.pdf
• ISSN: 0354-9836; 2334-7163

Upcoming stringent Euro-6 emission regulations for passenger vehicle better fuel economy, low cost are the key challenges for engine development. In this paper, 2.2L, multi cylinder diesel engine have been tested for four different piston bowls designed for compression ratio of CR 15.5 to improve in cylinder performance and reduce emissions. These combustion chambers were verified in CFD at two full load points. 14 mode points have been derived using vehicle model run in AVL CRUISE software as per NEDC cycle based on time weightage factor. Base engine with compression ratio CR16.5 for full load performance and 14-mode points on Engine test bench was taken as reference for comparison. The bowl with flat face on bottom corner has shown reduction 25% and 12 % NOx emissions at 1500 and 3750 rpm full load points at same level of Soot emissions. Three piston bowls were tested for full load performance and 14 mode points on engine test bench and combustion chamber ‘C’ has shown improvement in thermal efficiency by 0.8%. Combinations of cooled EGR and combustion chamber ‘C’ with geometrical changes in engine have reduced exhaust NOx, soot and CO emissions by 22%, 9 % and 64 % as compared to base engine at 14 mode points on engine test bench.