CAREER: The Study of Turbulence and Compressible Flows Using Molecular Filter Based Diagnostics

摘要 提案编号：CTS-9733388 主要研究者：Elliott 基于分子过滤器的湍流和可压缩流动诊断研究 该CAREER奖的主要目标是支持开发一种称为过滤角分辨瑞利散射（FARRS）的非侵入式流量诊断技术，该技术将同时测量瞬时速度，密度，温度和压力。 该技术测量来自询问流动的ND：YAG脉冲激光器的聚焦光束的点测量体积的散射。 变形光学系统用于分别记录以不同角度观察瑞利散射信号的光线。 记录在增强型CCD相机上的图像导致强度与视角轮廓。 通过在相机前面放置碘过滤器并将激光调谐到碘的吸收线，记录在CCD上的散射强度与视角轮廓的形状根据流动的速度、密度、温度和压力而改变。每个瞬时（10 ns）激光脉冲的轮廓然后可以用于计算流体性质。 将在亚音速和超音速轴对称射流中进行实验，以量化测量的准确性，探索对系统的改进以减少误差来源，并将该技术扩展到同时测量多个点。 这些测量结果将用于验证轴对称流的计算湍流模型，并在可能的情况下对模型进行改进。 此外，在资助期间，将改进一种称为平面多普勒测速（PDV）的技术，该技术可以测量二维场中的多个速度分量。 在FARRS和PDV的研制成功之后，将在更复杂的流动中进行测量，以研究可压缩紊流（即边界层和激波边界层相互作用）和流场，这些流场目前正在罗格斯大学由其他机构资助（超音速横流中的横向喷流、弱电离超音速流和与热喷涂过程有关的气体动力学）。 与工业界建立了合作关系（创新科学解决方案公司）。和光谱物理）和政府实验室（即赖特实验室）为这项研究计划。

ABSTRACT Proposal Number: CTS-9733388 Principal Investigator: Elliott The Study of Turbulence and Compressible Flows Using Molecular Filter Based Diagnostics The primary goal of this CAREER Award is to support the development of a non-intrusive flow diagnostic technique termed Filtered Angularly Resolved Rayleigh Scattering (FARRS), which will simultaneously measure instantaneous velocity, density, temperature, and pressure. This technique measures the scattering from a point measurement volume from a focused beam of a ND:YAG pulsed laser which interrogates the flow. An anamorphic optical system is used to separately record rays which view the Rayleigh scattered signal at different angles. The image recorded onto an intensified CCD camera results in an intensity verses viewing angle profile. By placing an iodine filter in front of the camera and tuning the laser to an absorption line of iodine, the scattered intensity verses viewing angle profile recorded on the CCD changes shape depending on the velocity, density, temperature, and pressure of the flow. The profile for each instantaneous (10 ns) laser pulse can then be used to compute the fluid properties. Experiments will be made in subsonic and supersonic axisymmetric jets to quantify the accuracy of the measurements, explore improvements to the system to reduce sources of error, and extend the technique to measure multiple points simultaneously. These measurements will be used to verify computational turbulence models of the axisymmetric 'et and improvements will 'II be made to the models when possible. Also during the funding period, improvements will be made to a technique termed Planar Doppler Velocimetry (PDV) which allows the measurement of multiple velocity components in a two dimensional field. Following success of the development of FARRS and PDV, measurements will be made in more complex flows to study compressible turbulence (i.e. boundary layers, and shock boundary layer interactions) and flowfields which are currently being funded at Rutgers by other agencies (a transverse jet in a supersonic cross flow, weakly ionized supersonic flows, and the gas dynamics associated with thermal spray processes). Collaborations have been set up with industry (Innovative Scientific Solutions Inc. and Spectra Physics) and government laboratories (i.e. Wright Laboratory) for this research plan.