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

叙述：康奈尔大学目前可用的脉冲激光系统（量子射线DCR-2）升级为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)密集气固流动中的速度和(2)预混湍流火焰反应区的自由基浓度。在密集的气固流动中，脉冲染料激光器可以使用光纤飞行时间风速计探头测量粒子和气体的速度。在探针尖端，激光诱导磷光被检测来推断示踪气体或特殊涂层颗粒的速度。这种新的诊断方法将提供流化床中气固流动模式的详细信息。在预混合湍流火焰燃烧中，可调谐染料激光诱导的自由基荧光提供了应变火焰结构的独特数据。

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.