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

职业：通过强可调声场控制烟灰生长动态

• 批准号: 9702327
• 负责人: Ofodike Ezekoye
• 金额: $ 30万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9702327&HistoricalAwards=false
• 关键词: CAREER; Control; Soot; Growth; Dynamics

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.

摘要 CTS-9702327 在该项目中，测试了一种提高固体颗粒燃烧产物增长率的新策略。 该技术涉及通过强声场照射肮脏的燃烧系统的废气流；这增强了烟灰的聚集并有利于其随后的收集。此外，当火焰嵌入声场时，会发生有趣的火焰动力学。 确定燃烧过程与声学的耦合。 尝试通过调节声场来控制火焰特性。 诊断仪通过声场跟踪火焰产生的烟灰。 烟灰形态通过采样和散射测量确定，冲击器测量表征烟灰尺寸分布，声场对局部火焰特性的影响随后是火焰区域中的流场、温度和组分测量。 计算补充了实验工作。 澄清烟灰生长物理学的好处是显着的。 大多数实用的大型燃烧器使用湍流非预混合火焰，这可能会产生大量烟灰，并且降低火焰中的烟灰数浓度的影响对环境具有重要意义。 目前的法规不要求对排放物中的颗粒尺寸分布进行表征，但最近对健康风险因素的资助许多改变了这一点。