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

美国日益严格的燃料经济性标准要求开发新的燃料效率更高的燃烧技术，因为传统火花点火燃烧的巨大收益下降。与火花点火燃烧相比，湍流喷射点火能够使峰值热效率提高近20%，从而降低燃料消耗和CO2排放。本研究的目的是研究湍流射流点火（TJI）过程，利用预燃室燃烧启动的基本方面。TJI概念涉及使用化学活性的湍流射流来启动贫或稀混合物中的燃烧。由湍流射流提供的大量分布式点火点使得即使在低温燃烧（LTC）发生的传统缓慢燃烧混合物中也能够实现短的燃烧持续时间。建议的研究的目标是1）实验研究中产生的活性自由基的TJI过程中，通过快速压缩机和光学可访问的发动机实验，2）开发一种新的LES建模技术来模拟TJI系统，湍流和活性物种从预燃室发挥作用，在TJI燃烧和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.