Effect of injection strategies and EGR on combustion characteristics of GDI Atkinson cycle engine

IF 5.1 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-03-25 DOI:10.1016/j.tsep.2025.103544

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.

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喷射策略和 EGR 对 GDI 阿特金森循环发动机燃烧特性的影响

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

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