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

摘要建议编号：CTS-9733388主要研究人员：埃利奥特基于分子过滤器的诊断学用于湍流和可压缩流动的研究这项职业奖的主要目标是支持一种名为过滤角度分辨瑞利散射(FARRS)的非侵入性流动诊断技术的开发，该技术将同时测量瞬时速度、密度、温度和压力。这项技术测量了来自询问流动的脉冲激光的聚焦光束的点测量体积的散射。变形光学系统被用来分开记录从不同角度观察瑞利散射信号的光线。记录在增强型ccd相机上的图像产生强度与视角的关系曲线。通过将碘滤光片放在相机前面，并将激光调谐到碘的吸收线上，记录在CCD上的散射强度与视角的关系曲线会根据水流的速度、密度、温度和压力而改变形状。然后可以使用每个瞬时(10 Ns)激光脉冲的轮廓来计算流体性质。将在亚音速和超音速轴对称喷气式飞机上进行实验，以量化测量的准确性，探索对系统的改进以减少误差源，并将该技术扩展到同时测量多个点。这些测量将用于验证轴对称的计算湍流模型，并将在可能的情况下对模型进行改进。此外，在资助期间，还将改进一种名为平面多普勒测速(PDV)的技术，该技术允许在二维场中测量多个速度分量。随着FARRS和PDV的成功开发，将在更复杂的流动中进行测量，以研究可压缩湍流(即边界层和激波边界层相互作用)和目前由其他机构资助的罗格斯大学的流场(超音速横流中的横向喷流、弱电离超音速流动和与热喷涂过程相关的气体动力学)。已经为这项研究计划与业界(创新科学解决方案公司和光谱物理公司)和政府实验室(即莱特实验室)建立了合作关系。

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.