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首页> 外文期刊>Clean technologies and environmental policy >Experimental and numerical investigations of effect of split injection strategies and dwell between injections on combustion and emissions characteristics of a diesel engine
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Experimental and numerical investigations of effect of split injection strategies and dwell between injections on combustion and emissions characteristics of a diesel engine

机译：对柴油机燃烧和排放特性进行分割喷射策略和喷射间隔的影响的实验和数值研究

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In this work, effects of various split injection strategies and dwell between injections on diesel engine combustion and emissions characteristics have been studied experimentally and numerically using Converge computational fluid dynamics tool. The electronic fuel injection unit, which is capable of injecting fuel up to four injections per cycle, was attached to the engine to achieve various split injection strategies. Results of the study showed that a significant reduction in nitrogen oxides with an acceptable change in particulate matter, hydrocarbons, carbon monoxide and brake thermal efficiency has been achieved with 2-shot:50(-27)-50 split injection strategy with a dwell of 8 crank angle as compared to the single injection strategy. Hence, split injection technique may be considered as an alternative to exhaust gas recirculation technique. Results also showed a fall in premixed heat release peak with an increase in diffusion combustion phase, when the dwell period was increased for all split injection strategies. As a consequence, reduction in nitrogen oxides and increase in particulate matter, hydrocarbons and carbon monoxide were observed with increased dwell between injections. Results of numerical study showed that contour area with higher temperature was observed to be lesser for 2-shot:50(-27)-50 split injection as compared to that for single injection, resulting in reduced nitrogen oxides.
机译：在这项工作中，使用Converge计算流体动力学工具，通过实验和数值研究了各种分割喷射策略以及喷射之间的停留时间对柴油机燃烧和排放特性的影响。将电子燃油喷射单元（每个循环最多可喷射四次燃油）安装到发动机上，以实现各种分割式喷射策略。研究结果表明，采用2-shot：50（-27）-50分流进样策略，并保留了20％的碳氢化合物，可以显着减少氮氧化物的排放，同时改变颗粒物，碳氢化合物，一氧化碳和制动热效率。与单次喷射策略相比，曲柄角为8。因此，分流喷射技术可以被认为是排气再循环技术的替代方案。结果还显示，当所有分流喷射策略的停留时间都增加时，预混合放热峰随扩散燃烧阶段的增加而下降。结果，观察到氮氧化物的减少以及颗粒物，碳氢化合物和一氧化碳的增加，并且进样之间的停留时间增加。数值研究结果表明，与单次进样相比，2次：50（-27）-50分次进样观察到的高温轮廓区域要小，从而减少了氮氧化物的产生。

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