There is significant interest worldwide in using cleaner/renewable fuels, such as syngas and biogas, in transportation and power generation systems. We report herein a computational study to investigate NO_x and soot emissions in n-heptane/methane triple flames in an opposed-jet configuration. The objective is to evaluate various fuel injection scenarios in a dual-fuel engine using a simple configuration to emulate important aspects of diesel combustion. Simulations are performed by combining a detailed fuel and NO_x chemistry model with a soot model. Three blending strategies are examined. For each strategy, NO_x, PAH and soot emissions, and thermal efficiency are characterized by varying the energy content between the two fuels, while keeping the total energy input rate fixed. As methane in the blend is increased, the benzene emission index and soot emission decrease with all three strategies, but the reduction is more pronounced with strategies 2 and 3. In addition, it leads to higher efficiency with strategies 2 and 3, but lower efficiency with strategy 1. Thus strategy #1 yields higher NO_x, PAH and soot emissions, and lower efficiency compared to other two strategies, and is not recommended.

全世界在运输和发电系统中使用清洁/可再生燃料，例如合成气和沼气，引起了极大的兴趣。我们在此报告了一项计算研究，以研究对流喷射配置下正庚烷/甲烷三重火焰中的NO _x和烟尘排放。目的是使用简单的配置来模拟柴油燃烧的重要方面，以评估双燃料发动机中的各种燃料喷射情况。模拟是由详细燃料和NO组合进行_X化学模型与煤烟模型。研究了三种混合策略。对于每种策略，NO _x，PAH和烟尘排放以及热效率的特点是，在保持总能量输入速率不变的情况下，改变两种燃料之间的能量含量。随着共混物中甲烷含量的增加，三种策略的苯排放指数和烟尘排放均降低，但策略2和3的降低更为明显。此外，策略2和3的效率更高，但效率更低与策略1。因此战略＃1的产率更高NO _X，PAH和烟灰的排放，并与其他两个策略较低的效率，和不推荐。