An investigation on the particulate number and size distributions over the whole engine map from an optimized combustion strategy combining RCCI and dual-fuel diesel-gasoline
An investigation on the particulate number and size distributions over the whole engine map from an optimized combustion strategy combining RCCI and dual-fuel diesel-gasoline
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DOI：
10.1016/j.enconman.2017.02.073
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发表时间：
2017-05-15
影响因子：
10.4
通讯作者：
Boronat, Vicente
中科院分区：
文献类型：
--
作者：
Benajes, Jesus;Garcia, Antonio;Boronat, Vicente
文献表明，对于预混合低温燃烧概念，颗粒物不能直接从烟尘排放测量中推断，如通常对于常规柴油机燃烧所做的那样。这是因为来自低温燃烧的颗粒物具有低分数的含碳化合物和大量的可溶性有机部分，其不能被诸如光学反射计的烟雾测量技术捕获。因此，研究这种燃烧技术的颗粒物特性需要使用特定的设备。目前的工作的目的是从双模式双燃料燃烧，这是一个优化的燃烧策略，结合充分和高度预混RCCI制度在低和中负荷，并切换到双燃料扩散燃烧在满负荷下的颗粒物特性的了解。该研究是在整个发动机图谱上进行的，使用15.3：1压缩比的中型欧VI柴油发动机。特别是，使用扫描迁移率粒度仪和冷凝颗粒计数器对颗粒数量和粒度分布进行采样，可以测量5至250 nm颗粒的粒度分布和总数。结果表明，完全预混RCCI燃烧是以小颗粒为主（迁移率直径小于30 nm），双燃料扩散模式以较大颗粒为主（迁移率直径约100 nm）显示出更类似柴油的粒度分布，高预混反应性控制压燃工况下，颗粒尺寸分布呈现过渡性，在20%左右有两个迁移率直径峰值80 nm。(C)2017爱思唯尔有限公司版权所有
Literature demonstrates that, for premixed low temperature combustion concepts, particulate matter cannot be directly extrapolated from soot emissions measurements, as typically done for conventional diesel combustion. This is because the particulate matter from low temperature combustion has low fraction of carbonaceous compounds and great amount of soluble organic fraction, which is not captured by the smoke measurement techniques such as the optical reflectometry. By this reason, the study of the particulate matter characteristics from this combustion techniques requires using specific equipment. The aim of the current work is to gain understanding on the particulate matter characteristics from the dual-mode dual-fuel combustion, which is an optimized combustion strategy that combines fully and highly premixed RCCI regimes at low and medium loads, and switches to dual-fuel diffusion combustion at full load. The study was performed over the whole engine map, using a 15.3:1 compression ratio medium-duty EURO VI diesel engine. In particular, the particulate number and size distributions were sampled using a scanning mobility particle sizer and a condensation particle counter, which allow measuring the size distribution and total number of particles from 5 to 250 nm. Results demonstrate that the fully premixed RCCI combustion is dominated by small particles (less than 30 nm in mobility diameter), the dual-fuel diffusion mode is dominated by larger particles (around 100 nm in mobility diameter) showing more diesel-like particle size distributions, and the highly premixed reactivity controlled compression ignition regime shows a transitional particle size distribution with two peaks of mobility diameters around 20 and 80 nm. (C) 2017 Elsevier Ltd. All rights reserved.