Prechamber NOx formation in low BMEP 2-stroke cycle natural gas engines |
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| Authors: | Daniel B. Olsen Justin M. Lisowski |
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| Affiliation: | 1. National Centre for Nuclear Research (NCBJ), Material Physics Department, Andrzeja Soltana 7, 05-400 Otwock-Swierk, Poland;2. Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, Poland;3. Institute of Plasma Physics and Laser Microfusion, Hery 23, 01-497 Warsaw, Poland;1. Department of Mechanical Engineering, Hormozgan University, Bandar Abbas, Iran;2. School of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, Iran;3. Research Institute for Petroleum Industry (RIPI), Tehran, Iran;1. Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Belo Horizonte, MG CEP 31270-90, Brazil;2. Centro Federal de Educação Tecnológica de Minas Gerais, Av. Amazonas 7675, Belo Horizonte, MG CEP 30510-000 Brazil;1. Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany;2. Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany |
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| Abstract: | Precombustion chambers (PCCs) are an ignition technology for large bore, natural gas engines enabling increased combustion stability while extending the lean limit of operation. A PCC is a small chamber, typically 1–2% of the clearance volume, in which a near-stoichiometric mixture of fuel and air is ignited by a standard spark plug. After the mixture in the PCC is ignited, its pressure rises and expels a flame jet of hot gas mixture into the main chamber. The amount of energy a typical PCC produces is roughly one million times that of a conventional spark plug. In this work the role that the PCC plays in the formation of oxides of nitrogen (NOx) is investigated. Previous research indicates that the PCC is responsible for a significant part of engine-out NOx, especially near the lean limit of engine operation. Experimental results are presented from a large bore lean-burn 2-stroke cycle engine. The data shows that the PCC is responsible for a significant part of engine-out NOx emissions. However, the PCC NOx does not form in the PCC. Rather it forms within the gas jet after it penetrates into the main chamber combustion gases. |
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