中国空间站燃烧科学实验柜火焰温度及碳烟体积分数地面重建

Ground-based reconstruction of flame temperature and soot volume fraction for combustion science rack aboard China space station

基于双色法和Tikhonov正则化算法,应用燃烧科学实验柜科学实验系统开展乙烯扩散火焰二维和三维温度及碳烟体积分数分布重建实验,以期为将来的微重力-常重力燃烧对比实验提供技术支持和地面数据。研究结果表明:火焰温度的计算误差约为3.03%,碳烟体积分数的计算误差约为3.86%;火焰温度沿径向先升高后降低,其峰值出现在靠近火焰边缘的位置;火焰上游处的碳烟体积分数分布呈中心低、四周高的趋势,而火焰下游的碳烟体积分数峰值则出现在火焰中心区域;依据SN571、SN610和SN573光学诊断设备采集的图像信息重建的峰值温度分别为1942、1954和1981 K,最高碳烟体积分数分别为11.34×10^(-6)、11.23×10^(-6)和11.02×10^(-6);三维重建的温度和碳烟体积分数分布与二维重建的分布一致,三维重建出的火焰峰值温度约为1900 K,最高碳烟体积分数约为10.60×10^(-6)。

Based on the two-color pyrometry and the Tikhonov regularization algorithm,the experiment for reconstructing the two/three-dimensional temperature and soot volume fraction distributions of ethylene diffusion flame was conducted using experimental system of combustion science rack,to provide the technical support and lay the foundation for the future microgravity-normal gravity combustion experiments.The results show that the calculation errors for flame temperature and soot volume fraction are approximately 3.03%and 3.86%,respectively.The flame temperature increases and then decreases along the radial direction,with the peak occurring near the edge of flame.The soot volume fraction shows a trend of low in the center and high around upstream of the flame,whereas the peak soot volume fraction appears in the flame center downstream of the flame.The peak temperatures of flame reconstructed from images that captured by the optical diagnostic devices SN571,SN610 and SN573 are 1942,1954 and 1981 K,and the maximum soot volume fractions are 11.34×10^(-6),11.23×10^(-6)and 11.02×10^(-6),respectively.Moreover,the flame temperature and soot volume fraction distributions from the three-dimensional reconstruction are consistent with those from the two-dimensional reconstruction.The peak temperature of flame calculated from three-dimensional reconstruction is approximately 1900 K,and the maximum soot volume fraction is approximately 10.6×10^(-6).