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首页> 外文期刊>Energy Conversion & Management >Effect of two-stage injection on combustion and emissions under high EGR rate on a diesel engine by fueling blends of diesel/gasoline, diesel-butanol, diesel/gasoline-butanol and pure diesel
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Effect of two-stage injection on combustion and emissions under high EGR rate on a diesel engine by fueling blends of diesel/gasoline, diesel-butanol, diesel/gasoline-butanol and pure diesel

机译：柴油/汽油，柴油/正丁醇，柴油/汽油/正丁醇和纯柴油的混合燃料对柴油发动机在高EGR率下两阶段喷射对燃烧和排放的影响

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摘要

The effect of two-stage injection on combustion and emission characteristics under high EGR (46%) condition were experimentally investigated. Four different fuels including pure diesel and blended fuels of diesel/gasoline, diesel-butanol, diesel/gasoline-butanol were tested. Results show that blending gasoline or/and n-butanol in diesel improves smoke emissions while induces increase in maximum pressure rise rate (MPRR). Adopting pilot injection close to main injection can effectively reduce the peak of premixed heat release rate and MPRR. However, for fuels blends with high percentage of low cetane number fuel, the effect of pilot fuel on ignition can be neglected and the improvement of MPRR is not that obvious. Pilot-main interval presents more obvious effect on smoke than pilot injection rate does, and the smoke emissions decrease with increasing pilot-main interval. A longer main-post interval results in a lower post heat release rate and prolonged combustion duration. While post injection rate has little effect on the start of ignition for post injection. The variation in fuel properties caused by blending gasoline or/ and n-butanol into diesel does not impose obvious influence on post combustion. The smoke emission increases first and then declines with retard of post injection timing. Compared to diesel, the smoke emissions of blended fuels are more sensitive to the variation of post injection strategy.
机译：实验研究了两阶段喷射对高EGR（46％）条件下燃烧和排放特性的影响。测试了四种不同的燃料，包括纯柴油和柴油/汽油，柴油/正丁醇，柴油/汽油/正丁醇的混合燃料。结果表明，在柴油中掺混汽油或/和正丁醇可改善烟气排放，同时增加最大压力上升率（MPRR）。在主喷射附近采用引燃喷射可以有效地降低预混合放热率和MPRR的峰值。但是，对于高十六烷值低百分数燃料的混合燃料，可以忽略引燃燃料对着火的影响，并且MPRR的改善不是很明显。飞行员主间隔对烟雾的影响比飞行员喷射速率更明显，并且烟雾排放随飞行员主间隔的增加而减少。较长的主柱间隔会导致较低的柱后放热速率和延长的燃烧持续时间。而后喷射速率对后喷射的点火开始几乎没有影响。由汽油或/和正丁醇混入柴油引起的燃料特性变化不会对后燃烧产生明显影响。随着后喷射时间的延迟，烟雾排放首先增加，然后下降。与柴油相比，混合燃料的烟气排放对后喷射策略的变化更为敏感。

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