REG: Injection-Seeded Nd:YAG Laser for PLIF and CARS Diagnostic Techniques

摘要 提案编号：CTS 96-10402主要研究者：达顿 这是一笔赠款，用于购买一种注入式Nd：YAG激光器，该激光器将致力于支持两个正在进行的流体动力学研究项目。 第一个项目的目的是获得定量的，时间分辨的测量分子混合在高雷诺数射流和剪切层。 为此目的而开发的诊断技术使用同时激发的平面激光诱导荧光（PLIF）从冷化学示踪剂接种在一个流和被动标量示踪剂接种在另一个流，这样的射流流体混合在分子水平的分数可以确定。 第二个项目的目标是开发和应用一种新的三激光相干反斯托克斯-拉曼散射（汽车）技术，用于同时测量高速气流中的压力、温度和密度。 对于这些测量，选择第二泵浦激光器和斯托克斯激光器的波长，使得同时获得氮的振动光谱和纯转动光谱。 压力和温度可以从三激光汽车光谱的形状确定，密度从状态方程获得。

ABSTRACT Proposal Number: CTS 96-10402 Principal Investigator: Dutton This is a grant to purchase an injection-seeded ND:YAG laser that will be dedicated to supporting two ongoing fluid dynamics research programs. The first project is aimed at obtaining quantitative, time-resolved measurements of molecular mixing in high Reynolds number jets and shear layers. The diagnostic technique that has been developed for this purpose uses the simultaneous excitation of planar laser-induced fluorescence (PLIF) from a cold chemistry tracer seeded in one stream and a passive scalar tracer seeded in another stream, such that the fraction of jet fluid mixed at the molecular level can be determined. The second project has as its objective the development and application of a new three-laser coherent anti-Stokes Raiman scattering (CARS) technique for the simultaneous measurement of pressure, temperature, and density in high-speed gas flows. For these measurements the wavelelgths of the second pump laser and the Stokes laser are selected so that the vibrational and pure rotational spectra of nitrogen are simultaneously acquired. Pressure and temperature can be determined from the shape of the three-laser CARS spectra, and density is obtained from an equation of state.