Manzheng Shu, Zongfa Liu, Fugui Wu, Yu Qiu, Jinyuan Pan
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Experimental Study on the Combustion and Emission Characteristics of Methanol/Gasoline Fuels in Direct Injection Miller Cycle Gasoline Engines
This study explores the thermal efficiency of high compression ratio Miller cycle engines and the impact of methanol and methanol/gasoline blends on combustion and emissions. Comparative experiments were conducted to investigate the thermal efficiencies of the Miller cycle compared to the conventional Otto cycle at different compression ratios and how methanol affects combustion and emissions. The results show that under high-speed and high-load conditions, the Miller cycle offers higher thermal efficiency and better tolerance to high compression ratios than the Otto cycle. In experiments conducted at 2000 rpm and 0.66 MPa GIMEP, using the Miller cycle with compression ratios of 11.5 and 14.5 increased thermal efficiency by about 0.6 and 0.8 percentage points compared to the Otto cycle. Using methanol/gasoline blends can advance the combustion phase without changing the load, further improving the engine’s thermal efficiency. Burning pure methanol under heavy load significantly improves combustion; it increases in-cylinder pressure by about 30%, thermal efficiency by 7.2 percentage points, and NOx emissions by 80% compared to gasoline. Furthermore, using methanol fuel significantly increases nucleation mode particles and decreases accumulation mode particles, with peak values shifting to smaller diameters.
期刊介绍:
The International Journal of Automotive Technology has as its objective the publication and dissemination of original research in all fields of AUTOMOTIVE TECHNOLOGY, SCIENCE and ENGINEERING. It fosters thus the exchange of ideas among researchers in different parts of the world and also among researchers who emphasize different aspects of the foundations and applications of the field.
Standing as it does at the cross-roads of Physics, Chemistry, Mechanics, Engineering Design and Materials Sciences, AUTOMOTIVE TECHNOLOGY is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from thermal engineering, flow analysis, structural analysis, modal analysis, control, vehicular electronics, mechatronis, electro-mechanical engineering, optimum design methods, ITS, and recycling. Interest extends from the basic science to technology applications with analytical, experimental and numerical studies.
The emphasis is placed on contributions that appear to be of permanent interest to research workers and engineers in the field. If furthering knowledge in the area of principal concern of the Journal, papers of primary interest to the innovative disciplines of AUTOMOTIVE TECHNOLOGY, SCIENCE and ENGINEERING may be published. Papers that are merely illustrations of established principles and procedures, even though possibly containing new numerical or experimental data, will generally not be published.
When outstanding advances are made in existing areas or when new areas have been developed to a definitive stage, special review articles will be considered by the editors.
No length limitations for contributions are set, but only concisely written papers are published. Brief articles are considered on the basis of technical merit.