Influence of Injection Timing on Equivalence Ratio Stratification of Methanol and Isooctane in a Heavy-Duty Compression Ignition Engine

Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKonferenspaper i proceeding


CO2 is a greenhouse gas that is believed to be one of the main contributors to global warming. Recent studies show that a combination of methanol as a renewable fuel and advanced combustion concepts could be a promising future solution to alleviate this problem. However, high unburned hydrocarbon (UHC) and carbon monoxide (CO) emissions can be stated as the main drawback in low load operations when using methanol under advanced combustion concepts. This issue can be mitigated by modifying the stratification of the local equivalence ratio to achieve a favorable level. The stratifications evolved, and the regimes that can simultaneously produce low emissions, and high combustion efficiency can be identified by sweeping the injection timing from homogeneous charge compression ignition (HCCI) to partially premixed combustion (PPC). Understanding how the stratification of the local equivalence ratio for methanol evolves during the sweep is essential to gain these benefits. Thus, the current experimental work has been carried out to investigate the influence of injection timing on the emissions and combustion efficiency of methanol. The experimental work was performed with a single cylinder heavy-duty engine, run at ~4 bar gross indicated mean effective pressure, and speed at 1200 rpm. Single injection strategy was applied, and the injection timing was swept from-140o to-15o aTDC. During the sweep, the combustion phasing (CA50) was kept at ~3o aTDC by tuning the intake temperature. To understand the impact of fuel properties along the sweep, isooctane was used and compared with methanol. Additionally, a numerical simulation was used to explain how the stratification of the local equivalence ratio evolved and impacted the combustion characteristics, emissions, and combustion efficiency during the whole sweep.


Enheter & grupper
Externa organisationer
  • Polytechnic University of Valencia

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Energiteknik
Titel på värdpublikationSAE Powertrains, Fuels & Lubricants Meeting
FörlagSociety of Automotive Engineers
StatusPublished - 2020 sep 15
Peer review utfördJa
EvenemangSAE 2020 International Powertrains, Fuels and Lubricants Meeting, PFL 2020 - Virtual, Online, Polen
Varaktighet: 2020 sep 222020 sep 24


NamnSAE Technical Papers
FörlagSociety of Automotive Engineers
ISSN (tryckt)0148-7191
ISSN (elektroniskt)2688-3627


KonferensSAE 2020 International Powertrains, Fuels and Lubricants Meeting, PFL 2020
OrtVirtual, Online

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