Transition from HCCI to PPC: Neat Methanol and PRF100 in a Heavy-Duty CI Engine Lund University

Format:

Book

Conference/Event

Author/Creator:

Azharī, ʻĀmir ʻAzīz, author.

Contributor:

Garcia, Antonio

Tuner, Martin

Xu, Leilei

Conference Name:

SAE Powertrains, Fuels & Lubricants Meeting (2020-09-22 : Krakow, Poland)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2020

Summary:

CO2 is a greenhouse gas in which is believed to be one of the main contributors to the global warming phenomena. 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 (HC) 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 local fuel/air stratification to achieve a favorable level. By sweeping the injection timing from homogeneous charge compression ignition (HCCI) to partially premixed combustion (PPC), the stratifications evolved and the regimes that can simultaneously produce low emissions and high efficiency can be identified. Understanding how the local fuel/air stratification for neat methanol evolves during the swept is essential to gain these benefits. Thus, the present experimental study has been carried out to investigate the influence of injection timing on the performance and emissions of neat methanol. The work was performed with a single cylinder heavy duty engine, operated at ~4 bar gross indicated mean effective pressure, and an engine speed of 1200 rpm. Single injection strategy was applied, and the injection timing was swept from -180o to -15o aTDC. During the swept, the combustion phasing (CA50) was kept at ~30 aTDC by tuning the intake temperature. To understand the impact of fuel properties along the swept, PRF100 (iso-octane) was used and compared with methanol. Additionally, a numerical simulation was used to understand how the local stratification evolved and impacting the autoignition, performance, and emissions during the whole swept. The results revealed that due to higher ignition resistance and higher heat of vaporization, methanol required ~60 oC higher intake temperature than PRF100. Methanol emitted lower CO and NOx emissions, but higher UHC compare to PRF100. Ultra-low soot emission was emitted from methanol

Notes:

Vendor supplied data

Publisher Number:

2020-01-2069

Access Restriction:

Restricted for use by site license