Engineering Research Equipment: A Combusting Flowfield Imaging System for the Study of One- and Two-Phase Reacting Flows

购买燃烧流场诊断系统 用于探测单相和两相的空间特性 反应流 该系统包括三个主要的 组成部分：（1）Nd：YAG激光器能够高脉冲能量 为了阐明所研究的反应流，（2）高 分辨率，固态摄像机检测散射激光 轻型，以及（3）具有硬件的超级计算机工作站 致力于真实的时间二维和三维图形 控制激光器和探测器的操作，分析和 显示测量数据，并执行计算任务 目前在超级计算机中心完成。 一些具体 将用该设备进行的实验如下： （1）物种浓度的测量， 层流预混和非预混火焰的温度;（2） 温度场的测量及其完整的三个- 在一个横截面内的106个点处的尺寸梯度 湍流火焰;（3）确定内部的物种， 使用受激拉曼散射或相干 反斯托克斯拉曼散射;（4）同时光谱和 燃料液滴的空间成像，这将允许 几种颗粒的尺寸和化学组成的测定 在一个单一的激光脉冲;和（5）燃烧的研究， 在一定范围内或聚集状态下的微米级固体颗粒 通过电喷雾技术。 激光诊断测量的潜在影响， 计算方法对燃烧研究的重要性。 通过 进行二维或三维测量， 可以确定大型结构的特性 以及流体运动和化学反应之间的相互作用 研究了 合作实验与计算 这项工作将有利于研究的两个部分。

A Combusting Flowfield Diagnostic System is to be purchased for probing the spatial characteristics of one- and two-phase reacting flows. The system consists of three major components: (1) a Nd:YAG laser capable of high pulse energies to illuminate the reacting flow under study, (2) a high resolution, solid-state camera to detect the scattered laser light, and (3) a supercomputer workstation with hardware dedicated to real time two-and three-dimensional graphics operations to control the laser and detectors, analyze and display the measured data, and perform computational tasks currently done at supercomputer centers. Some specific experiments which will be performed with this equipment are as follows: (1) measurement of species concentrations and temperatures in laminar premixed and nonpremixed flames; (2) measurement of the temperature field and its full three- dimensional gradient at 106 points within a cross section of a turbulent flame; (3) determination of the species inside a burning droplet using stimulated Raman scattering or coherent anti-Stokes Raman scattering; (4) simultaneous spectral and spatial imaging of fuel droplets, which will allow the determination of size and chemical makeup of several particles in a single laser pulse; and (5) study of the burning of micron-sized solid particles in a range or aggregation regimes by electrospray techniques. The potential impact of laser diagnostic measurements and computational methods on combustion research is great. By performing measurements in two or three dimensions, the characteristics of large-scale structures can be determined and the interaction between the fluid motion and the chemistry studied. The cooperative experimental and computational effort will benefit both portions of the research.