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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >A study on combined effect of high EGR rate and biodiesel on combustion and emission performance of a diesel engine
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A study on combined effect of high EGR rate and biodiesel on combustion and emission performance of a diesel engine

机译：高EGR率和生物柴油对柴油机燃烧和排放性能的综合影响研究

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Emission regulations put forward more and more stringent requirements on diesel engine exhaust emissions, especially on nitrogen oxides (No-x) and soot emissions. These two kinds of emissions present a trade-off relationship, which poses a challenge to meet the emission regulations simultaneously. This study was carried out on a four-cylinder, DI diesel engine to investigate the combined effect of high EGR and biodiesel on combustion and emission under different loads from 10% to 50% with different EGR rates from 10% to 62%. Cylinder pressure, combustion delay period, indicated mean effective pressure (IMEP), heat release rate (HRR), and NOx and soot emissions were measured or calculated. The results of experiments show that approximate isobaric curve of cylinder pressure arises with high EGR rate, and second stage combustion delay can be found from HRR curve, which indicates the engine is running at low temperature combustion (LTC) mode. With medium load, soot emission does not increase monotonically with the increase of EGR rate, instead, the highest soot emission occurs in medium EGR rates. In the soot-EGR diagram, the soot peak position of B20 moves to right compared with that of B0, which indicates that biodiesel needs a ligher EGR rate for LTC mode trigger. (C) 2017 Elsevier Ltd. All rights reserved.
机译：排放法规对柴油发动机排放的诸如诸如柴油发动机排放的更严格，特别是在氮氧化物（No-X）和烟灰排放上。这两种排放呈现出权衡关系，这会同时迎接挑战以满足排放法规。该研究在四缸，DI柴油发动机上进行，以研究高EGR和生物柴油在不同载荷下的燃烧和排放的综合影响，从10％至5​​0％，不同的EGR速率从10％到62％。气缸压力，燃烧延迟周期，指示平均有效压力（IMEP），测量或计算释放率（HRR）和NOx和烟灰排放。实验结果表明，圆柱压力的近似异步曲线具有高EGR速率，并且可以从HRR曲线找到第二级燃烧延迟，这表示发动机在低温燃烧（LTC）模式下运行。随着中等负荷，随着EGR速率的增加，烟灰发射不会单调增加，而是以媒体EGR速率发生最高的烟灰发射。在烟灰-EGR图中，B20的烟灰峰值与B0相比移动向右移动，这表明生物柴油需要用于LTC模式触发的Ligher EGR速率。 （c）2017 Elsevier Ltd.保留所有权利。

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