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Effect of exhaust gas recirculation (EGR) temperature for various EGR rates on heavy duty DI diesel engine performance and emissions

机译：各种EGR速率下的废气再循环（EGR）温度对重型DI柴油机性能和排放的影响

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摘要

DI diesel engines are well established today as the main powertrain solution for trucks and other relevant heavy duty vehicles. At the same time emission legislation (mainly for NO_x and particulate matter) becomes stricter, reducing their limit to extremely low values. One efficient method to control NO_x in order to achieve future emissions limits is the use of rather high exhaust gas recirculation (EGR) rates accompanied by increased boost pressure to avoid the negative impact on soot emissions. The method is based on the reduction of gas temperature level and O_2 availability inside the combustion chamber, but unfortunately it has usually an adverse effect on soot emissions and brake specific fuel consumption (bsfc). The use of high EGR rates creates the need for EGR gas cooling in order to minimize its negative impact on soot emissions especially at high engine load were the EGR flow rate and exhaust temperature are high. For this reason in the present paper it is examined, using a multi-zone combustion model, the effect of cooled EGR gas temperature level for various EGR percentages on performance and emissions of a turbocharged DI heavy duty diesel engine operating at full load. Results reveal that the decrease of EGR gas temperature has a positive effect on bsfc, soot (lower values) while it has only a small positive effect on NO. As revealed, the effect of low EGR temperature is stronger at high EGR rates.
机译：如今，DI柴油发动机已成为卡车和其他相关重型车辆的主要动力总成解决方案。同时，排放法规（主要针对NO_x和颗粒物）变得更加严格，将其限值降低到极低的值。控制NO_x以实现未来排放限值的一种有效方法是使用相当高的排气再循环（EGR）速率，同时增加增压压力，以避免对烟尘排放产生负面影响。该方法基于降低燃烧室内的气体温度水平和O_2的可用性，但是不幸的是，它通常对烟尘排放和制动比燃料消耗（bsfc）产生不利影响。高EGR率的使用产生了对EGR气体冷却的需求，以使其对烟灰排放的负面影响最小化，尤其是在EGR流量和排气温度较高的高发动机负载下。因此，在本论文中，使用多区域燃烧模型研究了各种EGR百分比下的冷却EGR气体温度水平对满负荷运转的涡轮增压DI重型柴油发动机的性能和排放的影响。结果表明，EGR气体温度的降低对bsfc，烟灰（较低的值）有积极的影响，而对NO的影响却很小。如所揭示的，在高EGR率下，低EGR温度的影响更强。

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