Flash Boiling Impact on Spray, Flame, Emissions, and Soot of Gasoline-Acetone-Butanol-Ethanol Blend at Simulated Cold-Start GDI Operation Using a CVCC China University of Mining and Technology, School of Low Car

Format:

Book

Conference/Event

Author/Creator:

Nour, Mohamed, author.

Contributor:

Cui, Mingli

Li, Xuesong

Qui, Shuyi

Xu, Min

Zhang, Weixuan

Conference Name:

SAE 2024 Vehicle Powertrain Diversification Technology Forum (2024-12-06 : Xi'An, China)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

The use of carbon-neutral fuels instead of conventional fuels in gasoline direct injection (GDI) engines is beneficial to global decarbonization. However, the application of renewable non-petroleum fuels in GDI engines is still unclear due to their different physicochemical properties. Acetone-Butanol-Ethanol (ABE) is a promising low-carbon alternative fuel for GDI engines, but its high viscosity and latent heat cause pool firing during cold start. The existing flash boiling technology can solve this problem. This study explores the effects of flash boiling on spray characteristics, flame propagation, soot, and emissions of gasoline-ABE blend in a constant volume combustion chamber (CVCC) without airflow. Optical windows, high-speed camera recording, in-chamber pressure measurement, Fourier transform infrared spectroscopy (FTIR), and transmission electron microscope (TEM) were used to analyze flame spreading, combustion characteristics, exhaust gases, and soot morphology. Flash boiling was performed at a superheat index of 0.3 and compared with the subcooled spray at 30°C. The results show that the flash boiling injection of ABE blends can effectively solve the problem of cold start. The peak heat release rate and peak pressure of gasoline-ABE mixtures during combustion are improved under flash boiling conditions, which shortens the ignition delay period and makes the flame front more concentrated and uniform, thus improving the flame stability. Additionally, flash boiling atomization can significantly reduce the emissions of aldehydes, hydrocarbons (HC), nitrogen oxides (NOx) and polycyclic aromatic hydrocarbons (PAHs). Compared with gasoline, ABE has a better inhibitory effect on HC and PAHs. Additionally, the formation of PAHs can be greatly reduced by optimizing the fuel-air mixture. The reduction of PAHs leads to the decrease of soot aggregates and primary particles. In conclusion, our study highlights the potential of flash boiling to reduce harmful emissions, making ABE a more viable alternative to gasoline

Notes:

Vendor supplied data

Publisher Number:

2025-01-7046

Access Restriction:

Restricted for use by site license