钟玉伟,魏超,潘明章.多次喷射策略对正戊醇-柴油混合燃料燃烧及有害排放影响的模拟研究[J].内燃机工程,2022,43(3):85-93.
多次喷射策略对正戊醇-柴油混合燃料燃烧及有害排放影响的模拟研究
Simulation Study on Effects of Vultiple Injection Strategy on Combustion and Pollutant Emissions of N-Pentanol–Diesel Blended Fuel
DOI：10.13949/j.cnki.nrjgc.2022.03.012
关键词:内燃机  数值模拟  正戊醇–柴油  单次喷射  多次喷射
Key Words:internal combustion engine  numerical simulation  n-pentanol–diesel  single injection  multiple injection
基金项目:国家自然科学基金重点项目（22172038，51865002）
作者单位E-mail
钟玉伟* 广西玉柴机器股份有限公司，玉林 537000 zhongyw@yuchai.cn 
魏超 广西玉柴机器股份有限公司，玉林 537000  
潘明章* 广西大学 机械工程学院，南宁 545004 pmz@gxu.edu.cn 
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摘要:为了揭示含氧燃料与喷油策略耦合对发动机燃烧、性能和排放特性影响的机制，基于三维仿真软件CONVERGE，耦合化学反应动力学机理，研究了正戊醇—柴油混合燃料在不同喷射策略下燃烧与有害排放物的生成过程。结果表明，正戊醇促进了燃烧过程，燃用正戊醇—柴油混合燃料时，缸内最高燃烧压力和燃烧放热峰值增大，发动机平均指示压力（indicated mean effective pressure， IMEP）升高，CO、总碳氢化合物（total hydrocarbons， THC）和碳烟排放降低，但NOx排放升高。采用大比例预喷射策略可以促进主喷燃烧过程，提高缸内温度，增大IMEP，但导致CO及THC排放升高，而小预喷间隔会导致碳烟排放增加。后喷射策略导致发动机IMEP降低，但可以降低NOx排放。在小后喷间隔下碳烟排放显著降低，但在大后喷间隔下碳烟排放明显升高。研究表明，正戊醇柴油混合燃料采用大预喷间隔及小后喷间隔的3次喷油策略，能够获得最高的IMEP及最低的有害物排放。
Abstract:In order to reveal the mechanism of the effects of coupling oxygenated fuel and injection strategy on engine combustion， performance and emission characteristics， the combustion and harmful emission generation processes of n-pentanol–diesel blended fuel under different injection strategies were studied based on the three-dimensional simulation software CONVERGE， coupled with chemical reaction kinetic mechanism. The results show that n-pentanol promotes the combustion process. When n-pentanol–diesel blended fuel was used， the maximum in-cylinder burst pressure， the peak heat release rate and the indicated mean effective pressure（IMEP） increase， while CO， total hydrocarbons（THC） and soot emissions decrease. But NOx emissions increase. In this study， a large proportional pre-injection strategy can promote the main injection combustion process， resulting in higher in-cylinder temperature and increased IMEP， but higher CO and THC emissions， while small pre-injection intervals lead to increased soot emissions. The post-injection strategy used in this study results in lower engine IMEP and lower NOx emissions. The soot emissions decrease significantly at small post-injection intervals， but increase significantly at large post-injection intervals. A three-injection strategy with large pre-injection intervals and small post-injection intervals for n-pentanol–diesel blends result in the highest IMEP and lowest harmful emissions.
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