Development of a Simultaneous Measurement Method of Velocity, Temperature, and Concentration using a Diode Laser in a Supersonic Combustion Flow

超音速燃烧流中使用二极管激光器同时测量速度、温度和浓度的方法的开发

基本信息

批准号：
11555254
负责人：
KOBAYASHI Hideaki
金额：
$ 7.17万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

This research was aimed to develop a new measurement method of velocity, temperature, and concentration in supersonic combustion flow by using a compact diode laser. This method is based on the infrared absorption characteristics of H_2O molecules.A InGaSaP diode laser was selected to detect 1.393 μm band of H_2O vibration-rotation transition. The investigation of the transition lines of H_2O molecules proved that two pairs of transition line are suitable for the temperature measurement in the range of 1300 K - 2000 K and 300 K - 1300 K separately. By collaboration research with a scientist in USA, the diode laser controller, laser corrector optics, and the measurement code were developed, and the assembling of the optical fibers and diode-laser laser optics were conducted.By using a supersonic-combustion test facility of Institute of Fluid Science, Tohoku University, measurement tests of supersonic air-flow and the combustion flow behind a flame holding strut were conducted to confirm … More the performance of the system developed in this research. For installing the laser probes to the measurement section of the wind tunnel, AR coated optical windows, pin-hole structure, and nitrogen-purge system were employed in order to minimize the effects of the surface reflection, flame radiation, and laser absorption by surrounding air. Results of the measurements showed that, in supersonic air-flow, data of temperature and velocity agreed well with the numerically estimated values without any data compensation. H_2O concentration agreed with estimated value when the background H_2O concentration caused by the residual H_2O via the air reheater of the wind tunnel was reduced. The velocity data for the combustion region was compared with the mean velocity measured by LDV and they agreed well. H_2O concentration was also agreed well with the values estimated based on chemical equilibrium of H_2-air flames in the wake region. From these results, the accuracy and feasibility of the diagnostic method developed in this research were confirmed. Less

本研究旨在开发一种利用紧凑型二极管激光器测量超音速燃烧流中的速度、温度和浓度的新方法。该方法基于H_2O分子的红外吸收特性。选用InGaSaP二极管激光器来检测1.393。 H_2O振动-旋转跃迁μm波段对H_2O分子跃迁谱线的研究证明了两对跃迁谱线适用于1300 K范围内的温度测量。分别与美国科学家合作研究 - 2000 K 和 300 K - 1300 K，开发了二极管激光控制器、激光校正光学器件和测量代码，并组装了光纤和二极管激光光学器件。利用东北大学流体科学研究所的超音速燃烧试验装置，进行了超音速气流和稳焰支柱后燃烧流的测量试验。为了确认本研究中开发的系统的性能，为了将激光探头安装到风洞的测量部分，采用了增透膜光学窗口、针孔结构和氮气吹扫系统，以最大限度地减少影响。测量结果表明，在超音速气流中，没有任何数据补偿，温度和速度数据与数值估计值吻合良好。与背景 H_2O 时的估计值一致风洞空气再热器残留的 H_2O 浓度有所降低，将燃烧区域的速度数据与 LDV 测量的平均速度进行比较，发现 H_2O 浓度也与估计值吻合良好。这些结果证实了本研究开发的诊断方法的准确性和可行性。