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

这项研究的目的是通过使用紧凑的二极管激光来开发超音速混合物流动中速度，温度和浓度的新测量方法。该方法基于H_2O分子的红外吸收特性。选择INGASAP二极管激光器以检测H_2O振动旋转转变的1.393μM带。 H_2O分子的过渡线的投资证明，两对过渡线适合分别在1300 K -2000 K和300 K -1300 K的温度测量范围内。 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 combination flow behind a flame holding strut were进行确认……更多的系统性能在这项研究中发展。为了将激光项目安装到风洞的测量部分，采用了AR涂层的光窗，针孔结构和氮螺栓系统，以最大程度地减少表面反射，火焰辐射和激光滥用的影响。测量结果表明，在超音速空气流中，温度和速度的数据与数值估计值的值一致，而没有任何数据补偿。当剩余的H_2O通过风洞的空气再热进行的背景H_2O浓度降低时，H_2O浓度与估计值一致。将组合区域的速度数据与LDV测得的平均速度进行了比较，它们同意了。 H_2O浓度也与基于尾流区域H_2-Air火焰的化学平衡估计的值非常吻合。从这些结果中，确认了这项研究中开发的诊断方法的准确性和可行性。较少的