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

高速光谱和可视化分析一氧化碳-氢-氧燃烧等离子体的温度和密度场

基本信息

批准号：
08458113
负责人：
KAYUKAWA Naoyuki
金额：
$ 4.67万
依托单位：
Hokkaido Univercity
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

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

该项目旨在获得磁流体发电机的工作流体的基本性质，磁流体发电机是环境可接受的磁流体/燃气涡轮机/蒸汽涡轮机联合发电系统的关键部件。建立了一种高速双光路发射/吸收光谱仪，利用两束正交偏振的光同时测量火焰发射强度和参考灯及火焰发射/吸收强度。光学系统的性能得到了证实，通过光谱分析钾种子乙炔-氧燃烧等离子体。根据作者提出的光学深度-吸收系数关系（Depth-AAC关系）进行了数据分析。计算得到的钾离子光学截面合理，证实了深度-AAC关系式的适用性。的条件 ...更多信息在乙炔等离子体实验中也阐明了适当波长的选择。其次，模拟煤合成燃料，对CO-H_2燃烧等离子体进行了测试，得到了等离子体的温度、钾离子光学截面和钾离子浓度。测得的温度低于预期。然而，新的研究表明，即使在贫燃料条件下，随着氧当量比降低到1以下，温度也会升高。在可视化实验中，从光学薄火焰的发射/吸收图像数据获得局部原子密度分布。最后，作为一种流动可视化技术，磁共振成像方法采用新设计的回波平面脉冲序列（MEPS）。测量了激波加热等离子体截面的速度分布。重建的图像在空间上具有很好的分辨力，并且与由磁流体引起的开路电压还原的图像吻合得很好。少