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Numerical analysis on the combustion and emission characteristics of forced swirl combustion system for DI diesel engines

机译:直喷式柴油机强制旋流燃烧系统燃烧和排放特性的数值分析

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摘要

To optimize the fuel/air mixture formation and improve the environmental effect of direct injection (DI) diesel engines, a new forced swirl combustion system (FSCS) was proposed concerned on unique design of the geometric shape of the combustion chamber. Numerical simulation was conducted to verify the combustion and emission characteristics of the engines with FSCS. The fuel/air diffusion, in-cylinder velocity distribution, turbulent kinetic energy and in-cylinder temperature distribution were analyzed and the results shown that the FSCS can increase the area of fuel/air diffusion and improve the combustion. The diesel engine with FSCS also shown excellent performance on emission. At full load condition, the soot emission was significantly reduced for the improved fuel/air mixture formation. There are slightly difference for the soot and NO emission between the FSCS and the traditional omega combustion system at lower load for the short penetration of the fuel spray.
机译:为了优化燃料/空气混合物的形成并改善直喷式(DI)柴油机的环境影响,提出了一种新型的强制旋流燃烧系统(FSCS),该系统涉及燃烧室的几何形状的独特设计。进行了数值模拟,以验证具有FSCS的发动机的燃烧和排放特性。分析了燃料/空气扩散,缸内速度分布,湍动能和缸内温度分布,结果表明,FSCS可以增加燃料/空气扩散面积,改善燃烧。装有FSCS的柴油发动机在排放方面也表现出出色的性能。在满载条件下,为了改善燃料/空气混合物的形成,烟灰排放显着减少。 FSCS和传统的omega燃烧系统在较低负荷下的烟尘和NO排放之间存在细微差异,这是因为燃料喷雾的渗透时间较短。

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