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Numerical assessment of flow dynamics for various DI diesel engine designs considering swirl number and uniformity index

机译：考虑旋流数和均匀度指数的各种DI柴油机设计流动动力学的数值评估

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Geometrical features of combustion chamber are important factors in subsequent engine's combustion and emissions. Location and configuration of bowl in diesel engine has been the dynamic field of research especially for optimization procedure. This study considers six different engine patterns with outlined parameters. It follows that different designs are characterized with different swirl motions and tumble flows within the combustion chamber. It was determined that maximum and minimum peak swirl number pertains to "Design5" and "Design1" with 1.59 and 1.1 values, respectively. By using "Design5" case instead of "Design1" (baseline case), uniformity index increased by 25.83% whereby peak soot concentration was reduced over 46.7%. The bigger bowl radius (R1) makes higher swirl ratio and this eventually leads to lower soot emission. Lower bowl depth (T), however, gives way to stronger squish pressure and engine-out power. (C) 2015 Elsevier Ltd. All rights reserved.
机译：燃烧室的几何特征是后续发动机燃烧和排放的重要因素。柴油机中转鼓的位置和配置一直是研究的动态领域，尤其是对于优化程序而言。这项研究考虑了具有概述参数的六种不同的发动机模式。因此，不同的设计具有不同的涡旋运动和燃烧室内的滚流特性。确定最大和最小峰值旋流数分别与值为1.59和1.1的“ Design5”和“ Design1”有关。通过使用“ Design5”案例而不是“ Design1”案例（基准案例），均匀性指数提高了25.83％，峰值烟灰浓度降低了46.7％。较大的转鼓半径（R1）产生较高的涡流比，最终导致较低的烟尘排放。然而，较低的铲斗深度（T）可以让压榨压力和发动机输出功率更大。 （C）2015 Elsevier Ltd.保留所有权利。

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