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基于可调谐半导体激光吸收光谱技术和代数迭代算法(ART)实现燃烧场温度和浓度二维分布重建.采用时分复用技术,在1kHz扫描频率下分别扫描H2O的两条吸收谱线,7205.25和7416.05cm1,对温度分布在300—1100K范围内的气体温度场进行了重建.研究了投影角度和投影光线数目对温度场和浓度场重建结果的影响,并将温度场重建结果与热电偶测量结果进行比较,结果表明,采用四个投影方向时,温度场重建结果与热电偶测量结果除中心低温区域外基本符合.当光线数目减少时,通过在两条光线间增加虚拟光线,代入到迭代算法中,增加光线数目,提高了温度场和浓度场的重建效果.但此方法受到燃烧场温度梯度大小的影响,即在两条光线之间气体温度梯度较大,增加虚拟光线提高温度场重建效果不明显.
Based on tunable semiconductor laser absorption spectroscopy and algebraic iterative algorithm (ART), two-dimensional distribution of temperature and concentration in the combustion field was reconstructed. Two absorption lines of H2O, 7205.25 and 7416.05 cm1 and the temperature distribution of the gas in the temperature range of 300-1100K was reconstructed.The effects of the projection angle and the number of projection light on the reconstruction results of the temperature field and the concentration field were studied and the results of the temperature field reconstruction and the thermocouple measurement were carried out The results show that when the four projection directions are used, the results of the temperature field reconstruction basically coincide with those of the thermocouple measurement except for the central low temperature region.When the number of light decreases, the virtual light is added into the two light rays and substituted into the iterative algorithm , Which increases the number of light rays and improves the reconstruction effect of temperature field and concentration field.But this method is affected by the temperature gradient of the combustion field, that is, the gradient of gas temperature between the two light rays is relatively large. obvious.