Experimental study on improvement of air-dilution combustion performance of methanol engine by adjusting intake guide flappers, exhaust variable valve timing and split injection

Wang Xiangyang, Liu Yu, Li Xiaoping, Xie Fangxi and Jiang Beiping

Energy, 2024, vol. 313, issue C

Abstract: This study investigates the effects of adjusting intake guide flappers, EVVT, and split injection on the performance of a four-cylinder, four-stroke methanol direct-injection engine. The results show that installing the optimal transverse flapper 4 and longitudinal flapper 5 leads to a reduction in CA5-IG and CA90-CA10, an advance in CA50, a decrease in CO and HC emissions, and an increase in NOx emissions. After optimizing the ignition timing, the BSFC can be reduced by 1.5 %. Installing the optimal flappers enhances the reduction in BSFC and mitigates the increase in COVIMEP caused by delayed EVVT. With the installation of the normal flapper, flappers 4 and 5, the lowest BSFC occurs at an EVVT of −10°CA. Meanwhile, BSFC is reduced by 1.1 %, 1.5 %, and 2.0 % compared to −25°CA, while COVIMEP increases by 48.8 %, 36.2 %, and 13.9 %. Installing the optimal flappers enhances the improvement of split injection on combustion performance, fuel economy, and cyclic variation. With the installation of the normal flapper, flappers 4 and 5, the lowest BSFC and COVIMEP occurs at the second injection ratio of 10 %. Meanwhile, compared to single injection, BSFC decreases by 0.2 %, 0.9 %, and 0.6 %, while COVIMEP decreases by 18.5 %, 32.6 %, and 31.9 %.

Keywords: Air-dilution combustion; Methanol engine; Intake guide flapper; EVVT; Split injection strategy (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:313:y:2024:i:c:s036054422403603x

DOI: 10.1016/j.energy.2024.133825

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