轴对称含烟黑火焰非均匀温度与烟黑浓度分布同时重建模拟研究

对于非均匀吸收、发射、无散射的轴对称含烟黑火焰对象,常规双色法不再适用。本文基于烟黑辐射特性,提出并模拟研究了同时重建火焰温度与烟黑容积份额的新的辐射测量方法。从重建结果看,重建误差主要集中在火焰中心区域,这是观测路径上测量误差累积的结果。温度重建主要受火焰断面参数分布类型影响,而烟黑容积份额重建主要受测量误差的影响,这由它们与单色辐射强度的内在关系所决定。

SIMULATION ON SIMULTANEOUS RECONSTRUCTION OF NON-UNIFORM TEMPERATURE AND SOOT VOLUME FRACTION IN AXISYMMETRIC SOOTING FLAMES

For visualizing non-uniform absorbing, emitting, non-scattering, axisymmetric sooting flames, because conventional two-color emission methods are no longer suitable, a new emission method for the simultaneous estimation of temperature and soot volume fraction distributions in these flames is studied in this paper. The results indicate that the estimated vaues of temperature and soot volume fraction in flame center are less accurate than those in outer ring of flame which is caused by the noninvasive detectting technique adopted which provides accumulation intensity data in measured lines. The temperature estimation is sensitive to flame structures which correspond to different temperature and soot concentration distributions, but not sensitive to measurement error. However, the estimated soot volume fraction values are sensithe to measurement error. It can be explained by their inherent relations with monochromic intensities.