| 徐学亮,何爽,郭骥飞,魏强,高莹,徐英健.高滚流Atkinson循环燃烧系统研究[J].内燃机工程,2019,40(6):78-85. |
| Study on Atkinson Cycle with High Tumble Combustion System |
| DOI：10.13949/j.cnki.nrjgc.2019.06.012 |
| Key Words:Atkinson cycle high tumble gasoline engine knock high compression ratio exhaust gas recirculation(EGR) |
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| Abstract:For the improvement of engine thermal efficiency, the concept of the Atkinson cycle with high tumble combustion system was proposed, which adopts the combination of high tumble intake port and piston, and coordinates the Atkinson cycle and exhaust gas recirculation(EGR) technology to improve in-cylinder tumble and turbulence level, accelerate combustion speed, and reduce knock tendency. The engine work process model and in-cylinder computational fluid dynamics(CFD) model of a certain engine were set up by the GT-Power and AVL-FIRE software respectively. The simulation results show that a high tumble intake port benefits in-cylinder tumble, which increases from 0.5 of the base engine to 2.6; with high tumble intake ports and pistons, both the initial tumble generated during the intake process and the tumble maintained during the compression process are stronger than the base engine, the average turbulence energy increases by 6.3%, and the average heat release rate increases by 15% compared with the base engine. In order to decrease the knock tendency caused by high compression ratio, the Atkinson cycle, which is realized by late intake valve closing timing, was introduced with EGR based on the foresaid high tumble. The results show that the brake specific fuel consumption(BSFC) in the universal characteristic appears downward trend. The lowest BSFC area becomes larger obviously, and the lowest BSFC decreases by 11.3 g/(kW·h) against the base engine. |
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