CFD Simulations of Pre-Chamber Jets' Mixing Characteristics in a Heavy Duty Natural Gas Engine

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


The effect of pre-chamber volume and nozzle diameter on performance of pre-chamber ignition device in a heavy duty natural gas engine has previously been studied by the authors. From the analysis of recorded pre- and main chamber pressure traces, it was observed that a pre-chamber with a larger volume reduced flame development angle and combustion duration while at a given pre-chamber volume, smaller nozzle diameters provided better ignition in the main chamber. The structure of pre-chamber jet and its mixing characteristics with the main chamber charge are believed to play a vital role, and hence CFD simulations are performed to study the fluid dynamic aspects of interaction between the pre-chamber jet and main chamber charge during the period of flame development angle, i.e. before main chamber ignition. It has been observed that jets from a larger pre-chamber penetrates through the main chamber faster due to higher momentum and generates turbulence in the main chamber earlier. At a given pre-chamber volume, smaller nozzle diameter causes higher velocity jet also causing high turbulence built up and better distribution of active species from the pre-chamber into the main chamber.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Mechanical Engineering


  • Internal combustion engines, ignition system, pre-chamber ignition, CFD simulation
Original languageEnglish
Title of host publication[Host publication title missing]
PublisherSociety of Automotive Engineers
Number of pages9
Publication statusPublished - 2015
Publication categoryResearch
EventJSAE/SAE Powertrain, Fuels and Lubricants International Meeting, 2015 - Kyoto, Japan
Duration: 2015 Sep 12015 Sep 4


ConferenceJSAE/SAE Powertrain, Fuels and Lubricants International Meeting, 2015