Engineering Research Equipment Grant: Pulsed Dye Laser Upgrade for Gas-Solid and Turbulent Flame Diagnostics

工程研究设备补助金：用于气固和湍流火焰诊断的脉冲染料激光升级

• 批准号: 8704993
• 负责人: Michel Louge
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-05-01 至 1988-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8704993&HistoricalAwards=false
• 关键词: Engineering; Research; Equipment; Grant; Pulsed

Narrative: A pulsed laser system presently available at Cornell (Quanta-Ray DCR-2) is upgraded to include a third harmonic generator, a dye oscillator/amplifier, and a doubling crystal. The resulting pulses of tunable coherent light enable measurements of (1) velocities in dense gas-solid flows and (2) radical species concentrations in the reaction zone of premixed turbulent flames. In dense gas-solid flows, the pulsed dye laser enables particle and gas velocity measurements using a fiber-optic time-of-flight anemometer probe. At the probe tip, laser-induced- phosphorescence is detected to infer velocity of a tracer gas or specially coated particles. This new diagnostic will provide detailed information on gas-solid flow patterns in fluidized beds. In premixed turbulent flame combustion, fluorescence of radical species induced by the tunable dye laser provides unique data on the structure of strained flamelets.

叙述：康奈尔大学目前可用的脉冲激光系统(Quanta-Ray DCR-2)经过升级，包括三次谐波发生器、染料振荡器/放大器和倍频晶体。由此产生的可调谐相干光脉冲能够测量(1)稠密气-固流中的速度和(2)预混湍流火焰反应区中的自由基组分浓度。在稠密的气固两相流中，脉冲染料激光可以使用光纤飞行时间风速计探头测量颗粒和气体的速度。在探头尖端，检测激光诱导磷光，以推断示踪气体或特殊涂层颗粒的速度。这一新的诊断方法将提供有关流态化床气固两相流动模式的详细信息。在预混湍流火焰燃烧中，可调谐染料激光诱导自由基组分的荧光提供了关于应变火焰团结构的独特数据。