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

摘要CTS-9702327 在这个项目中，一个新的战略，提高增长率的固体颗粒燃烧产物进行了测试。 该技术涉及的辐射的废气流从肮脏的燃烧系统由一个强烈的声场，这增强了聚集的烟尘，并促进其随后的收集。此外，有趣的火焰动力学发生时，火焰是嵌入在声场。 确定了燃烧过程与声学的耦合。 试图通过调整声场来控制火焰特性。 诊断仪通过声场追踪火焰产生的烟尘。 烟尘形态是由采样和散射测量，冲击器测量的烟尘粒度分布的特征，和声场对局部火焰特性的影响，其次是流场，温度，和物种的测量在火焰区。 计算是对实验工作的补充。 澄清烟灰生长物理学的好处是显著的。 大多数实际的大型燃烧器使用湍流非预混火焰，其潜在地产生大量的烟灰，并且减少来自火焰的烟灰数浓度的影响是环境显著的。 目前的法规并不要求表征排放物中的颗粒尺寸分布，但最近对健康风险因素的资助改变了这一点。

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.