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

• 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
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555254/
• 关键词: Supersonic Combustion; Laser Diagnostics; Diode Laser; Velocity Measurement; Temperature Measurement; Concentration Measurement

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

本研究旨在建立一种利用小型二极管激光器测量超声速燃烧流中速度、温度和浓度的新方法。该方法是基于H_2O分子的红外吸收特性。采用InGaSaP二极管激光器检测了1.393 μm波段的H_2O振动-旋转跃迁。对H_2O分子过渡谱线的研究证明，两对过渡谱线分别适用于1300 K ~ 2000 K和300 K ~ 1300 K范围内的温度测量。通过与美国科学家的合作研究，开发了二极管激光控制器、激光校正光学器件和测量码，并进行了光纤和二极管激光光学器件的组装。利用日本东北大学流体科学研究所的超声速燃烧实验设备，对超声速气流和隔焰支板后燃烧气流进行了测量试验，进一步验证了所研制系统的性能。在风洞测量段安装激光探头时，采用了AR涂层光学窗、针孔结构和氮气吹扫系统，以尽量减少表面反射、火焰辐射和激光被周围空气吸收的影响。测量结果表明，在超声速气流中，温度和速度数据与数值计算值吻合较好，没有任何数据补偿。当减少风洞空气再热器残余H_2O引起的背景H_2O浓度时，H_2O浓度与估定值一致。将燃烧区域的速度数据与LDV测量的平均速度进行了比较，两者吻合较好。H_2O浓度与根据尾迹区h_2 -空气火焰化学平衡计算的值吻合较好。这些结果证实了本研究所建立的诊断方法的准确性和可行性。少

项目成果

西出洋平,小林秀昭,Mark G.ALLEN: "超音速燃焼流における半導体レーザーを用いた温度・濃度・速度同時計測"東北大学流体科学研究所報告. 第12巻(印刷中). (2001)

Yohei Nishide、Hideaki Kobayashi、Mark G. ALLEN：“使用半导体激光器在超音速燃烧流中同时测量温度、浓度和速度”东北大学流体科学研究所报告第 12 卷（出版中）。

西出洋平,小林秀昭,Mark,G.ALLEN: "超音速燃焼流における半導体レーザーを用いた温度・濃度・速度同時計測"東北大学流体科学研究所報告. 第12巻(印刷中). (2001)

Yohei Nishide、Hideaki Kobayashi、Mark、G. ALLEN：“使用半导体激光在超音速燃烧流中同时测量温度、浓度和速度”东北大学流体科学研究所报告第 12 卷（出版中）。

Nishide, Y., Kobayashi, H.and Allen, M.G.: "Simultaneous Measurements of Velocity, Temperature, and Concentration using a Diode Laser in a Supersonic Combustion Flow"Report of Institute of Fluid Science, Tohoku University. Vol.12(in press). (2001)

Nishide, Y.、Kobayashi, H. 和 Allen, M.G.：“在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”东北大学流体科学研究所的报告。