Analysis of Temperature and Density Field of Carbon Monoxide-Hydrogen-Oxygen Combustion Plasma by Means of High-Speed Spectrometry and Visualization

该项目旨在获得MHD发电机工作流体的基本特性，MHD发电机是环境可接受的MHD/燃气轮机/汽轮机联合发电系统的关键部件。建立高速光谱法和流动可视化也是重要的目标。构建了高速双路发射/吸收光谱仪，以两束正交偏振光同时测量火焰发射和参考灯加火焰发射/吸收强度。通过对钾种子乙炔-氧燃烧等离子体的光谱分析，证实了该光学系统的性能。数据分析基于笔者先前提出的光学深度-吸收系数关系（Depth-AAC关系）。计算得到的钾离子光学截面是合理的，从而证实了深度- aac关系的适应性。并在乙炔等离子体实验中阐明了选择合适波长的条件。其次，模拟煤合成燃料，测试一氧化碳-氢燃烧等离子体，得到温度、钾光学截面和钾浓度。测得的温度低于预期。然而，新的研究表明，即使在燃料稀薄的条件下，温度也会升高，氧当量比低于1。在可视化实验中，从光学薄火焰的发射/吸收图像数据中获得了局部原子密度分布。最后，采用新设计的回波平面脉冲序列（MEPS）作为流动显示技术，采用磁共振成像技术。测量了冲击加热等离子体的横截面速度分布。重构图像在空间上得到了很好的分辨，与MHD诱导开路电压还原后的图像吻合较好。少

This project aims to obtain basic properties of working fluids for an MHD power generator with is a key component in an environmentally acceptable MHD/Gas Yurbine/Steam Turbine combined power generation system. The establishment of a high-speed spectrometry and flow visualization are also important objectives.A high-speed two-path emission/ absorption spectrometer was construced, in which the flame emission and the reference lamp plus flame emission/ absorption intensities were simultaneously measured as two orthogonally polarized light beams. The performance of the optical system was confirmed by spectrometric analyzes of potassium seeded acetylene-oxygen combustion plasmas. The data analysis was carried out based upon the optical depth-absorption coefficient relationship (Depth-AAC relationship) formerly proposed by the author. The calculated optical cross section of the potassium was reasonable and thus the adaptability of the depth-AAC relationship was confirmed. The conditions for … More selection of the appropriate wavelengths were also clarified in the acetylene plasma experiment. Next, modeling the coal synthesized fuel, the carbon monoxide-hydrogen combustion plasma was tested and the temperature, the potassium optical cross section and the potassium concentration were obtained. The measured temperature was lower than expected. However it was newly shown that the temperature was increased even under a fuel lean condition with the decrease in the oxygen equivalence ratio below unity. In the visualization experiments the local atom density sistribution was obtained from an emission/ absorption image data from an optically thin flame. Finally, as a flow visualization technique, the magnetic resonance imaging method was employed using newly designed echo-planar pulse sequences (MEPS). The cross sectional velocity distribution of shock-heated plasma was measured. The reconstructed image was well resolved in space and agreed well with those reduced from the MHD induced open circuit voltage. Less