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

Bin Aziz, Amir LU ; Xu, Leilei LU ; Garcia, Antonio and Tunér, Martin LU (2020) SAE 2020 International Powertrains, Fuels and Lubricants Meeting, PFL 2020 In SAE Technical Papers
Abstract

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... (More)

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.

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Please use this url to cite or link to this publication:
author
; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
SAE Powertrains, Fuels & Lubricants Meeting
series title
SAE Technical Papers
issue
2020-01-2069
article number
2020-01-2069
publisher
Society of Automotive Engineers
conference name
SAE 2020 International Powertrains, Fuels and Lubricants Meeting, PFL 2020
conference location
Virtual, Online, Poland
conference dates
2020-09-22 - 2020-09-24
external identifiers
  • scopus:85092737288
ISSN
0148-7191
2688-3627
DOI
10.4271/2020-01-2069
project
High Octane Number Fuels in Advanced Combustion Modes for Sustainable Transportation
language
English
LU publication?
yes
id
e77aba83-8db2-4239-8f1c-57320615a390
date added to LUP
2020-10-26 15:32:21
date last changed
2024-06-12 22:12:30
@inproceedings{e77aba83-8db2-4239-8f1c-57320615a390,
  abstract     = {{<p>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.</p>}},
  author       = {{Bin Aziz, Amir and Xu, Leilei and Garcia, Antonio and Tunér, Martin}},
  booktitle    = {{SAE Powertrains, Fuels & Lubricants Meeting}},
  issn         = {{0148-7191}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{2020-01-2069}},
  publisher    = {{Society of Automotive Engineers}},
  series       = {{SAE Technical Papers}},
  title        = {{Influence of Injection Timing on Equivalence Ratio Stratification of Methanol and Isooctane in a Heavy-Duty Compression Ignition Engine}},
  url          = {{http://dx.doi.org/10.4271/2020-01-2069}},
  doi          = {{10.4271/2020-01-2069}},
  year         = {{2020}},
}