Zhiqiang Yu, Zongyu Yue, Shouzhen Zhang, Dezhong Ning, Yufeng Qin, Li Sheng, Zunqing Zheng, Mingfa Yao
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引用次数: 0
Abstract
Natural gas is an emerging alternative fuel for internal combustion engines in the transportation sector. However, the performance of natural gas engines can be significantly affected by changes in atmospheric pressure and temperature at high altitudes. To address this issue and enhance the performance of natural gas engines in plateau environments, a study focused on a two-stage turbocharged heavy-duty spark-ignition natural gas engine and its performance improvement is conducted targeting at operating altitude of 4000 m. A one-dimensional model of the engine is firstly developed and validated against experimental data at varying altitudes. The experimental and simulated data suggest engine power loss of 3% and 18% at 2500 m and 4000 m altitudes, respectively. Then, a response surface model of the engine is constructed employing the Box–Behnken experimental design method, considering optimization factors such as the compression ratio (CR), spark timing (ST), and bypass valve equivalent diameter (BVED). The objectives of the optimization are to enhance power, reduce brake specific fuel consumption (BSFC) and minimize nitrogen oxide (NOx) emissions. Finally, while adhering to engine durability constraints, the NSGA-II optimization algorithm is utilized for the multi-objective optimization. The optimization results demonstrate that at an altitude of 4000 m, the engine power recovers to approximately 86% of that at sea level, with a slight increase in BSFC and a decrease in NOx emissions. Therefore, this proposed engine optimization method effectively restores the performance of natural gas engines at high altitudes.
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.