CONVERSION OF A DIESEL ENGINE TO OPERATE WITH HCCI OF WET ETHANOL IN ONE OF THE CYLINDERS

Ivanir Fischer¹; André Nakaema Aronis¹; Mario Martins¹; Felipe de Vargas Lewisky¹; Diego Golke¹

¹ UNIVERSIDADE FEDERAL DE SANTA MARIA

doi:10.20906/CPS/COB-2015-2161

Resumo

The Homogeneous Charge Compression Ignition (HCCI) is an alternative combustion concept which provides high efficiency and low emission levels. Due to these advantages, HCCI has been object of several studies. HCCI shows also great potential when using renewable fuels such as ethanol, which offers the benefit of being a renewable fuel with high knock resistance. This paper presents the construction process of a computational model of an HCCI engine, validated with experimental tests that provided results of heat release, energy efficiency and a thorough combustion analysis. For this analysis, a GT-Power TPA (three pressure analysis) template has been used to post-processing data from the experiments. A three-cylinder four-stroke engine originally fueled with diesel was used. The diesel injection system in one of the cylinders was replaced by an ethanol electronic fuel injection. Inlet heat for achieving HCCI was provided by complete exhaust recycling from one of the diesel cylinders. Stable HCCI combustion was achieved on the ethanol cylinder, with very low cycle-to-cycle combustion variation and similar indicated efficiency as of the original diesel engine.

Palavras-chave: HCCI; ethanol; exhaust heat recovery