基于激光的后向角散射法测量蒸汽湿度

为了能够更加准确地测量出汽轮机末级蒸汽湿度,为锅炉给水量提供依据,促进汽轮机内部除湿技术的发展，本文采用后向角散射法的思路设计湿蒸汽参数测量模型,并对该模型所需物理量的计算方法进行了详细的研究,为后向散射法测量蒸汽湿度的研究提供参考。通过定性分析各个参数对水滴群散射光强分布的影响,提出以后向150°作为采光角,并对其进行仿真模拟,得到了散射光光强与蒸汽湿度参数有关。在此基础上通过反演寻优得到了稳定工况与变工况条件下的蒸汽湿度。该研究对光散射法测量蒸汽湿度的实验分析是有帮助的。

Research on steam humidity measurement by the backward angle scattering

In order to precisely measure the stream turbine humidity at the final stage,the parameter measurement model of steam humidity was designed by backward angle scattering method,and the computing methods of this model was studied.The effects of the various parameters on the scattering light intensity distribution of the drop group were qualitatively analyzed,and the backward direction of 150° was set as the lighting angle and simulation experiments were done.The results show that scattering light intensity is related to the stream humidity parameters.On this basis,the steam humidity under the stable and unstable condition was obtained through inversion and optimization.The study is helpful for measuring the steam humidity by laser scattering method.