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

美国日益严格的燃油经济性标准要求开发新的更省油的燃烧技术，因为随着传统火花点火燃烧技术的下降，燃烧效率大大提高。与火花点火相比，湍流喷射点火使热效率峰值提高了近20%，从而降低了燃油消耗和二氧化碳排放。这项研究旨在研究湍流射流点火(TJI)过程的基本方面，该过程利用预燃室燃烧启动。TJI的概念涉及使用化学活性的湍流射流在稀薄或稀薄的混合物中启动燃烧。湍流射流提供的大量分布着火点使得燃烧持续时间很短，即使在传统的缓慢燃烧混合物中也是如此，这些混合物发生在低温燃烧(LTC)中。拟议研究的目标是：1)通过快速压气机和光学发动机实验，通过实验检测TJI过程中产生的活性自由基；2)开发一种新的大涡模拟技术来模拟TJI系统，因为预燃室中的湍流和活性物质在TJI燃烧中都起着作用；3)在金属发动机测试中，对可控腔式TJI系统进行实验研究？S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.