CAREER: Control of Soot Growth Dynamics by Strong Tunable Acoustic Fields

CTS-9702327在本项目中，对一种提高燃烧固体颗粒产物增长率的新策略进行了试验。这项技术涉及用强声场照射来自肮脏燃烧系统的流出物；这增强了烟尘的聚集，并促进了随后的收集。此外，当火焰嵌入声场中时，会发生有趣的火焰动力学。确定了燃烧过程与声学的耦合。尝试通过调谐声场来控制火焰特性。诊断仪跟踪火焰通过声场产生的烟尘。烟尘形态由采样和散射测量确定，冲击器测量表征烟尘尺寸分布，声场对局部火焰特性的影响之后是火焰区的流场、温度和物种测量。计算是对实验工作的补充。澄清烟尘生长物理学的好处是显著的。大多数实用的大型燃烧器使用湍流非预混火焰，这可能会产生大量的碳烟，而降低火焰中的碳烟浓度对环境的影响是显著的。目前的法规并不要求描述排放中颗粒物的大小分布，但最近关于健康风险因素的基金改变了这一点。

ABSTRACT CTS-9702327 In this project, a novel strategy for enhancing growth rates of solid particulate products of combustion is tested. The technique involves the irradiation of the effluent stream from a dirty combustion system by an intense acoustic field; this enhances the aggregation of the soot and facilitates its subsequent collection. Also, interesting flame dynamics occur when the flame is embedded in the acoustic field. The coupling of the combustion processes to the acoustics are determined. Control of flame properties by tuning the acoustic field is attempted. Diagnostic's track soot production from the flame through the acoustic field. Soot morphology is determined by sampling and scattering measurements, impactor measurements characterize the soot size distribution, and effects of the acoustic field on local flame properties are followed by flowfield, temperature, and species measurements in the flame zone. Computations complement the experimental work. The benefits of clarifying soot-growth physics are significant. Most practical large-scale burners use turbulent nonpremixed flames which potentially produce large amounts of soot, and the impact of reducing the soot number concentration from the flame is environmentally significant. Current regulations do not require characterization of particulate size distribution in emissions, but recent fundings on health risk factors many change this.