The Interaction Between the Pilot Diesel and Main NG Injection in an HPDI Engine

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

High Pressure Direct Injection (HPDI) is a promising combustion concept for the medium- to heavy-duty industry to combat climate change. It uses a pilot diesel injection to ignite the main fuel consisting of Natural Gas (NG). Both fuels are injected directly in the combustion chamber using a dedicated HPDI injector. A significant reduction in carbon dioxide and Particulate Matter is achieved due to the use of the low carbon fuel NG. It is seen in literature that a small change in pilot injection can have profound consequences for the HPDI combustion. This research investigates the interaction between the pilot diesel and main NG injection. A relevant Computational Fluid Dynamics (CFD) simulation environment is setup for this purpose. It is observed that the main NG injection needs a certain pilot trigger to ignite. Furthermore, local conditions are derived to investigate driving factors of the ignition of NG on a fundamental level. A homogeneous reactor model is used to study Ignition Delay (ID) behavior by varying the initial temperature as well as concentrations of radicals H and OH. It is observed that both factors influence the ID. The initial temperature has to be higher than 1110 K in order to ignite the NG under enginelike conditions. It is also observed that species mole fractions H or OH encountered in the CFD simulation can reduce the ID up to 5.5 crank angle degrees at a speed of 1400 RPM.
Original languageEnglish
Title of host publicationProceedings of ASME 2021 Internal Combustion Engine Division Fall Technical Conference, ICEF 2021
PublisherAmerican Society of Mechanical Engineers
Number of pages9
ISBN (Electronic) 978-0-7918-8551-2
DOIs
Publication statusPublished - 19 Nov 2021
EventASME 2021 Internal Combustion Engine Division Fall Technical Conference, ICEF 2021 - Virtual, Online
Duration: 13 Oct 202115 Oct 2021
Conference number: ICEF 2021

Conference

ConferenceASME 2021 Internal Combustion Engine Division Fall Technical Conference, ICEF 2021
Period13/10/2115/10/21

Bibliographical note

V001T06A013

Keywords

  • NG
  • CFD modeling
  • Dual fuel engine
  • Ignition delay
  • Diesel
  • Direct injection
  • CFD
  • Dual fuel
  • HPDI

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