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首页> 外文期刊>Journal of Mechanical Science and Technology >An investigation on effect of high pressure post injection on soot and NO emissions in a DI diesel engine
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An investigation on effect of high pressure post injection on soot and NO emissions in a DI diesel engine

机译：DI柴油机高压后喷射对烟尘和NO排放影响的研究

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NO and Soot trade off is an important challenge for engineers in DI Diesel engines. This paper, introduces multiple injection as a strategy for simultaneous reduction of NO and Soot emissions on a DI diesel engine and also proposes a new concept of variable injection pressure and studies its effect on the engine emissions. To evaluate the benefits of multiple injection strategies and to reveal combustion mechanism, modified three dimensional CFD code KIVA-3V was developed. Results showed that using post injection with appropriate dwell between injection pulses has a great effect on simultaneous reduction of the emissions. Based on computational results, NO reduction formation mechanism in multiple injection strategy is as a single injection with retarded injection timing. It is shown that reduction in soot formation is because of the fact that in split fuel injection the soot, which is producing rich regions at the head of fuel spray, are not replenished by newly injected fuel in post injection pulse. Also increasing injection pressure in post injection will reduce the Soot emission dramatically while NO emission is in control for increase of fuel burning rate in post injection pulse.
机译：NO和烟尘的折衷对DI柴油发动机的工程师来说是一项重要的挑战。本文介绍了多次喷射作为同时减少DI柴油机NO和烟尘排放的策略，并提出了可变喷射压力的新概念并研究了其对发动机排放的影响。为了评估多种喷射策略的益处并揭示燃烧机理，开发了改进的三维CFD代码KIVA-3V。结果表明，使用后喷射并在喷射脉冲之间保持适当的停留时间，对同时减少排放有很大的影响。根据计算结果，多次喷射策略中NO减少的形成机理为单次喷射，喷射正时延迟。示出的是，烟灰形成的减少是由于以下事实：在分批燃料喷射中，在燃料喷射的顶部产生富油区域的烟灰在后喷射脉冲中不会被新喷射的燃料补充。同样，在后喷射中增加喷射压力将显着减少烟灰排放，同时控制NO排放以增加后喷射脉冲中的燃料燃烧率。

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