联合莫尔与发射层析诊断高温复杂流场的研究

The 3-D visualization and key parameters (temperature and electron number density) measurement of high-temperature complex flow fields with the characteristics of the temperature can up to thousands or even ten thousands of degrees, transient and non-uniform have not been well solved up to now. This project integrates moiré tomography and emission computerized tomography (ECT) to diagnose high-temperature complex flow fields, which means that the 3-D visualization and key parameters measurement are executed. In theory, the testing principle of integrating moiré tomography and ECT to realize the flow fields' diagnosis is studied, the feasible parameter reconstruction theory and model are established. Besides, the species composition's spatial distribution characteristic of high-temperature complex flow fields is studied, based on which the corresponding temperature and electron number density partition reconstruction models are proposed. In experiment, a set of experimental system which integrates moiré tomography and ECT, is designed and established to visualize and measure high-temperature complex flow fields. Based on which, the 3-D refractive index and luminance distributions of typical high-temperature complex flow fields are given. Finally, the principle and technology of integrating moiré tomography and ECT to diagnose high- temperature complex flow fields are clarified. In a word, this project fully utilizes the advantages of different optical computerized tomography technologies in solving different problems. In particular, the involved research results will provide theoretical basis and experimental foundation for better solving various high-temperature flow fields' visualization and key parameters' measurement.

温度高达数千度甚至上万度，时间上非稳定、空间分布非均匀的高温复杂流场的3-D全场显示和关键参数（温度、电子数密度）测量至今尚未得到很好的解决。本项目将联合莫尔与发射层析诊断高温复杂流场，对其进行3-D结构显示和关键参数测量。理论方面，研究联合莫尔与发射层析实现高温复杂流场诊断的测试原理；建立合适的莫尔层析重建理论和参数反演模型；在分析高温复杂流场成分空间分布特点的基础上，提出温度、电子数密度分区重建模型。实验方面，设计并构建一套联合莫尔与发射层析的高温复杂流场显示与关键参数测量的实验测试系统，给出典型高温复杂流场的3-D折射率和亮度分布。最终，阐明联合莫尔与发射层析诊断高温复杂流场的原理和技术。总之，本项目充分利用了不同光学层析技术在解决不同问题方面的优势，相关研究成果可望为能够较好地解决各类高温复杂流场的显示和关键参数的测量提供理论基础和实验依据。

温度高达数千度甚至上万度，时间上非稳定、空间分布非均匀的高温复杂流场的3-D 全场显示和关键参数（温度、电子数密度）测量至今尚未得到很好的解决。针对这个问题，本项目联合莫尔与发射层析技术实现了高温复杂流场的3-D 结构显示和关键参数诊断。. 一方面，本项目研究了联合莫尔与发射层析实现高温复杂流场诊断的测试原理；建立合适的莫尔层析重建理论和参数反演模型；在分析高温复杂流场成分空间分布特点的基础上，对流场进行合理的区域划分，确定每个区域的成分种类及其分布；最终通过提出温度、电子数密度分区重建模型进行参数重建。. 另一方面，设计并构建了一套联合莫尔与发射层析的高温复杂流场显示与关键参数测量的实验测试系统；通过编程实现两个CCD 的同步内触发，以便对上述两种层析技术所获投影数据进行匹配；并通过实验计算和重建得出典型高温复杂流场的3-D折射率和亮度分布。. 总之，本项目充分利用了不同光学层析技术在解决不同问题方面的优势，研究成果可望为高温复杂流场的3-D全场显示和关键参数的测量提供重要的理论基础和实验参考，且相关成果可进一步推广并应用于各种高温复杂流场中，如工业上电站锅炉炉膛、内燃机、柴油机等的火焰诊断及可视化研究、高温焊接和等离子体切割等等。.本项目执行期间，在国内外期刊发表文章16篇，其中SCI检索文章15篇。协助培养在读硕士生1名，参加国内学术会议1次，圆满完成预期目标。