Hydrogen Addition For Improved Lean Burn Capability of Slow and Fast Burning Natural Gas Combustion Chambers

Summary, in English

One way to extend the lean-burn limit of a natural gas engine is by addition of hydrogen to the primary fuel. This paper presents measurements made on a one-cylinder, 1.6- liter natural gas engine. Two combustion chambers, one slow and one fast burning, were tested with various amounts of hydrogen (0, 5, 10 and 15%-vol) added to natural gas. Three operating points were investigated for each combustion chamber and each hydrogen content level; idle, part load (5 bar IMEP) and 13 bar IMEP (simulated turbocharging). Air/fuel ratio was varied between stoichiometric and the lean limit. For each operating point, a range of ignition timings were tested to find maximum brake torque (MBT) and/or knock. Heat-release rate calculations were made in order to assess the influence of hydrogen addition on burn rate. Addition of hydrogen showed an increase in burn rate for both combustion chambers, resulting in more stable combustion close to the lean limit. This effect was most pronounced for lean operation with the slow combustion chamber.

• Författare: Per Tunestål; Magnus Christensen; Patrik Einewall; Tobias Andersson; Bengt Johansson; Owe Jönsson
• Avdelning/ar: Förbränningsmotorer
• Publiceringsår: 2002
• Språk: Engelska
• Sidor: 21-32
• Publikation/Tidskrift/Serie: SAE Special Publications
• Volym: 2002
• Issue: 1725
• Fulltext: - 216 kB; Download statistics
• Länkar: http://dx.doi.org/10.4271/2002-01-2686
• Dokumenttyp: Konferensbidrag
• Förlag: Society of Automotive Engineers
• Ämne: Energy Engineering
• Nyckelord: Natural Gas; CNG; Hydrogen; Hythane; Spark Ignition; Combustion; Engine
• Conference name: SAE Powertrain & Fluid Systems Conference & Exhibition, 2003
• Conference date: 2003-10-27 - 2003-10-30
• Conference place: Pittsburgh, PA, United States
• Status: Published
• Projekt: Competence Centre for Combustion Processes
• ISBN/ISSN/Övrigt: ISSN: 0099-5908