Scalability Aspects of Pre-Chamber Ignition in Heavy Duty Natural Gas Engines

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


This article presents a study related to application of pre-chamber ignition system in heavy duty natural gas engine which, as previously shown by the authors, can extend the limit of fuel-lean combustion and hence improve fuel efficiency and reduce emissions. A previous study about the effect of pre-chamber volume and nozzle diameter on a single cylinder 2 liter truck-size engine resulted in recommendations for optimal pre-chamber geometry settings. The current study is to determine the dependency of those settings on the engine size. For this study, experiments are performed on a single cylinder 9 liter large bore marine engine with similar pre-chamber geometry and a test matrix of similar and scaled pre-chamber volume and nozzle diameter settings. The effect of these variations on main chamber ignition and the following combustion is studied to understand the scalability aspects of pre-chamber ignition. Indicated efficiency and engine-out emission data is also presented. It has been found that the performance of a pre-chamber is strongly affected by the size of the engine is it being used in. Even with the same energy content in the pre-chamber at the time of spark, the resulting initial main chamber heat release has been found to scale with engine size, and hence the optimal settings for pre-chamber volume and nozzle diameter are also found to scale with engine size.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Mechanical Engineering
  • Energy Engineering
Original languageEnglish
Title of host publicationSAE Technical Papers
PublisherSociety of Automotive Engineers
Publication statusPublished - 2016
Publication categoryResearch
EventSAE 2016 World Congress and Exhibition, 2016 - Detroit, United States
Duration: 2016 Apr 122016 Apr 14


ConferenceSAE 2016 World Congress and Exhibition, 2016
CountryUnited States