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旋流燃烧火焰中温度及烟黑颗粒浓度分布对于旋流燃烧机理及燃烧器设计具有重要意义,提出了一种新的离散重建模型,用于旋流火焰内温度及烟黑颗粒浓度的三维联合重建。该模型以CCD为测量传感器,通过构建辐射逆问题求解方程,从CCD输出的辐射投影图像重建温度分布。通过数值模拟讨论了测量噪声、烟黑颗粒浓度对重建精度的影响,结果表明即使在有噪声的情况下,该模型也能获得准确的测量结果。文中实验测量了450kg/h重油旋流火焰内温度及烟黑颗粒体积浓度分布,温度测量结果与热电偶的差异在50℃以内。
The temperature of swirling flame and the concentration distribution of smoke black particles are of great significance to the swirling combustion mechanism and burner design. A new discrete reconstruction model is proposed for the three-dimensional combination of swirling flame internal temperature and smoke black particle concentration reconstruction. The model takes CCD as the measuring sensor, constructs the inverse problem of radiation to solve the equation and reconstructs the temperature distribution from the radiation projection image output by CCD. The influence of measurement noise and particle concentration of smoke black on the reconstruction accuracy is discussed through numerical simulation. The results show that the model can obtain accurate measurement results even under noisy conditions. In this paper, the temperature of 450kg / h heavy oil swirling flame and the distribution of volume concentration of smoke black particles were experimentally measured. The difference between temperature measurement and thermocouple was within 50 ℃.