Engineering Research Equipment Grant: Dye Laser System

将购买一个染料激光系统，以支持在两个独特的实验设施中进行的柴油燃烧和排放形成过程的基础研究-一个光学可达的直喷式柴油发动机和一个高压化学流动反应器。一家发动机公司、美国国家科学基金会和能源部正在赞助一项研究，研究一种特殊结构的柴油发动机燃烧室中烟灰和一氧化氮的演变；本研究采用基于激光的烟尘和NO的平面成像技术。这项研究的目的是为了更好地了解这一过程，以便制定缸内策略，同时减少氮氧化物和颗粒排放。为了补充柴油机燃烧的研究，采用高压化学流动反应器，研究了压力对柴油机冷启动和爆震过程中烃类自燃化学性质的影响。除了稳定产物的测量外，重要的自由基种类将通过荧光或吸附技术来确定。这项研究的动机是柴油发动机制造商的需要，他们不能满足环境保护局1994年制定的氮氧化物和微粒排放标准，而不使用微粒捕集器，这将对发动机的可靠性和燃料经济性产生不利影响。

A dye laser system will be purchased to support fundamental investigations of Diesel combustion and emission formation processes being conducted in two unique experimental facilities -an optically accessible, DI Diesel engine and a high pressure, chemical flow reactor. An Engine Company, NSF, and the Department of Energy are sponsoring research on the evolution of soot and NO within the combustion chamber of a specially constructed Diesel engine; this research uses laser- based, planar imaging of soot and NO. The objective of the study is to obtain an improved understanding of the processes so that in-cylinder strategies can be developed to simultaneously reduce NOx and particulate emissions. To complement the engine research on Diesel combustion, a high pressure, chemical flow reactor is being used to study the effects of pressure on the chemistry of hydrocarbon auto- ignition related to Diesel cold starting and knock. In addition to the measurement of stable products, important radical species will be determined by fluorescence or adsorption techniques. This research is motivated by the needs of Diesel engine manufacturers who cannot meet the NOx and particulate emissions standards set by the Environmental Protection Agency for 1994 without the use of particulate traps which will adversely affect engine reliability and fuel economy.