UNS: Autoignition of Liquid Hydrocarbon Droplets in Lean, High Pressure Natural Gas Mixtures Using a Rapid Compression Machine

1510550 - MarcheseThis项目将研究柴油燃料液滴如何在发动机内的代表性条件下被点燃。 由于非常稀薄的燃烧条件，燃料成本和污染物的形成可以从传统的柴油或火花点火发动机中减少。 研究将涉及研究生，从而为他们的研究或工程生涯做好准备。实验测量和化学动力学研究提出了柴油液滴点火/燃烧在预混甲烷-空气混合物使用快速压缩机（RCM）在代表的条件下的发动机，即，高压和高温。研究结果对RCCI（反应性控制压燃）燃烧具有重要意义，可以降低传统柴油机或火花点火发动机的燃料成本和污染物生成。 RCCI概念涉及在每个发动机循环中两种燃料的燃烧，其中一种燃料比另一种燃料更难点燃。 第一次将研究环境是燃料-空气的稀薄混合物的真正的双燃料燃烧。 该研究简化了RCCI燃烧中的几个步骤，将注意力集中在更容易点燃的组分（在该研究中为正庚烷）的汽化和点燃，以及其随后点燃主要燃料（天然气，相对便宜，因此有可能降低燃料成本）的能力。 调查将产生急需的RCCI燃烧数据，以帮助推动行业发展。

1510550 - MarcheseThis project will investigate how the Diesel fuel droplet can be ignited under conditions representative of those inside the engine. Because of the very lean combustion conditions, fuel costs and pollutant formation can be reduced from those of traditional diesel or spark ignited engines. The research will involve graduate students, thus preparing them for a research or engineering career.Experimental measurements and chemical kinetic studies are proposed on diesel droplet ignition/combustion in premixed methane-air mixture using a rapid compression machine (RCM) at conditions representative of those of engines, i.e., high pressures and high temperatures. The result will have implication for RCCI (reactivity controlled compression ignition) combustion in that fuel costs and pollutant formation can be reduced from those of traditional diesel or spark ignited engines. The RCCI concept involves combustion of two fuels in each engine cycle, in which one fuel is more difficult to ignite than the other. The true dual fuel combustion where the ambient is a lean mixture of fuel-air will be studied for the first time. The proposed study simplifies several of the steps in RCCI combustion to focus attention on the vaporization and ignition of the more easily ignited component, n-heptane in this proposed study, and its subsequent ability to ignite the main fuel (natural gas, which is relatively cheap, and thus the potential to reduce fuel costs). The investigation will yield much needed RCCI combustion data to help advance the industry.