NSF/DOE Partnership on Advanced Combustion Engines- Modeling and Experimental Studies of Controllable Cavity Turbulent Jet Ignition Systems

toulson， elisa美国日益严格的燃油经济性标准要求开发新的燃油效率更高的燃烧技术，因为传统的火花点火燃烧带来的巨大收益正在下降。与火花点火燃烧相比，湍流射流点火可以将峰值热效率提高近20%，从而降低燃油消耗和二氧化碳排放。本研究的目的是研究湍流射流点火（TJI）过程的基本方面，利用预燃烧室燃烧起爆。TJI的概念包括使用化学活性的湍流射流来启动稀或稀混合物的燃烧。湍流射流提供了大量的分布式点火点，即使在低温燃烧（LTC）下传统缓慢燃烧的混合物中，燃烧时间也很短。本研究的目标是：1)通过快速压缩机和光学可及的发动机实验，实验检测TJI过程中产生的活性自由基；2)开发一种新的LES建模技术来模拟TJI系统，因为湍流和来自预室的活性物质在TJI燃烧中都起作用；3)实验研究可控腔TJI系统？在金属发动机测试中的性能和效率。

Abstract#1258581Toulson, ElisaThe United States' increasingly stringent fuel economy standards require the development of new more fuel efficient combustion technologies as large gains with conventional spark ignition combustion decline. Turbulent jet ignition enables a near 20% peak thermal efficiency improvement relative to spark ignition combustion, resulting in both lower fuel consumption and CO2 emissions. This research aims to examine fundamental aspects of the turbulent jet ignition (TJI) process, which utilizes pre-chamber combustion initiation. The TJI concept involves the use of a chemically active, turbulent jet to initiate combustion in lean or dilute mixtures. The large number of distributed ignition sites provided by the turbulent jet enable short combustion durations even in the traditionally slow burning mixtures that occur with low temperature combustion (LTC). The objectives of the proposed research are 1) to experimentally examining the active radicals generated in the TJI process through both rapid compression machine and optically accessible engine experiments, 2) to develop a new LES modeling technique to model the TJI system, as both turbulence and active species from the pre-chamber play a role in TJI combustion and 3) to experimentally examine the controllable cavity TJI system?s performance and efficiency in metal engine tests.