Tingpu He , Jianqin Fu , Yaorui Shen , Boquan Qin , Changhe Wei
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Abstract
The sweeping tests for exhaust gas recirculation (EGR) rates and different injection strategies (injection ratio and injection timing) were conducted on a gasoline direct injection (GDI) Atkinson cycle engine (ACE). The influences of above factors on thermodynamic, combustion and emission features of ACE were investigated. The results showed that larger EGR rate may not obtain better performance and the optimal condition occurs at the EGR rate of 7 %. At the EGR rate of 0 % and 7 %, the brake specific fuel consumption (BSFC) is respectively decreased by 4.18 g/(kW·h) and 3.64 g/(kW·h) by replacing single injection with double injection. As the second injection ratio (SIR) increases, the ignition delay is inevitably prolonged and heat release process is slowed down, leading both NOx and HC to decline but CO to ascend. The effect of second injection timing (SIT) on operating parameters enlarges significantly at the larger SIR. The later SIT deteriorates combustion and harms the fuel economy of ACE consequently, resulting in sharp drop in NOx emission (up to 44.9 %) but rise in other emissions. In general, the overall performance of ACE with double injection is superior to that with single injection, especially at the SIR of 0.2 at target condition.
期刊介绍：
Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.
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