Fuel and Combustion

Fuel and Combustion

Computational evaluation of the combustion chamber geometry and applying syngas in a heavy-duty off-road Reactivity Controlled Compression Ignition (RCCI) engine

Document Type : Original Article

Authors
Bahram Jafari 1
Mahdi Seddiq 2
Seyyed Mostafa Mirsalim 3
1 Faculty of Engineering Modern Technologies, Amol University of Special Modern Technologies (AUSMT
2 Department of Mechanical Engineering, Faculty of Engineering, Ayatollah Boroujerdi University, Borujerd, Iran
3 Department of Mechanical Engineering, Amirkabir University, Tehran, Iran
10.22034/jfnc.2021.275881.1270
Abstract
This numerical research conducted using CONVERGE Computational Fluid Dynamic (CFD) code and devoted to assessing the simultaneous and separate impacts of Diesel Direct Injection Timing (DDIT) (16 to 6 Crank Angle (CA) Before Top Dead Center (BTDC) with 2 CA steps), combustion chamber geometry (re-entrant (baseline), cylindrical, and wide-shallow chamber), and applying syngas (20 and 40% of total energy per cycle) in a heavy-duty off-road RCCI engine. In the case of combustion simulation, the SAGE combustion model was used coupled with a detailed chemical kinetic mechanism consist of 72 species and 360 reactions. Results showed that under baseline operating conditions (DDIT of 10 CA BTDC and using re-entrant piston bowl) increasing the syngas to diesel ratio up to 40% caused a 3.4% rise in heat transfer loss and simultaneous reduction in Nitrogen Oxides (NOx) about 12%, Particulate Matter (PM) up to 88%, and Hydro-Carbons (HCs) nearly 82% compared to Pure Diesel Combustion (PDC) conditions. Besides, utilizing the wide-shallow combustion chamber along with diesel injection at 16 CA BTDC at diesel- 40% syngas combustion operating conditions led to the increment of heat transfer loss (7%), combustion loss (2.5%), and also, simultaneous reduction of NOx (3%), PM (37%), HC (62%), and gross indicated efficiency (4.7%) compared to baseline PDC case.
Keywords
RCCI combustion
Syngas
Combustion chamber
Diesel injection timing
Emission
Gross indicated efficiency
Subjects
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