THERMAL SCIENCE

International Scientific Journal

Nasreldin M. Mahmoud

,

Wenjun Zhong

,

Qian Wang

,

Qifei Yuan

,

Zhixia He

ON THE EFFECT OF INJECTION PRESSURE ON SPRAY COMBUSTION AND SOOT FORMATION PROCESSES OF GASOLINE/SECOND GENERATION BIODIESEL BLEND

ABSTRACT
The 70 GB, which comprises 70% gasoline and 30% biodiesel, shows excellent potential for application in gasoline compression ignition due to its superior lubrication capability, renewability, environmental friendliness, high ignitability contributed by biodiesel namely as hydrogenated catalytic biodiesel (HCB), and high volatility conferred by gasoline. However, the spray combustion and emission characteristics of 70 GB fuel have not yet been quantitatively evaluated. In this work, we performed a comprehensive simulation focusing on the ignition delay, heat release rate, flame lift-off length, flame structure, and soot formation of 70 GB in a constant volume chamber under various fuel injection pressure. Numerical results showed that, different injection pressure strongly impact the heat release rate without affecting the maximum temperature. Increasing the injection pressure from 80-120 MPa, increased the heat release rates by 23%. The ignition delay was marginally affected by increasing injection pressure, while a 5.7 mm increase in flame lift-off length observed with higher injection pressure. Additionally, 65% lower soot formation was typically predicted for higher injection pressure 120 MPa. In particular, the soot mass is primarily controlled by enhancing the atomization and evaporation processes, as well as improving fuel-air mixing rate, which was achieved by increasing the injection pressure. Furthermore, the role of soot oxidation was insignificant in reducing soot with increasing injection pressure, while the soot initiation step and soot surface growth step play an important role in soot suppression with increasing injection pressure for 70 GB fuel.
KEYWORDS
Gasoline-HCB blends: CFD simulation, Operation conditions, Flame structure: Soot formation
PAPER SUBMITTED: 2024-01-09
PAPER REVISED: 2024-05-21
PAPER ACCEPTED: 2024-05-25
PUBLISHED ONLINE: 2024-08-18
DOI REFERENCE: https://doi.org/10.2298/TSCI240109156M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 5, PAGES [3967 - 3978]
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On the effect of injection pressure on spray combustion and soot formation processes of gasoline/second generation biodiesel blend

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence