湿蒸汽参数后向异轴散射测量模型的优化及实验研究  

Optimization and experimental study on a backward non-coaxial scattering model for the measurement of wet steam parameters

作　　者：胡青松 黄章俊[1] 黄竹青[1] 唐振洲 袁志超 罗艳珍 HU Qing-song;HUANG Zhang-jun;HUANG Zhu-qing;TANG Zhen-zhou;YUAN Zhi-chao;LUO Yan-zhen(College of Energy and Power Engineering,Changsha University of Science & Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学能源与动力工程学院,湖南长沙410114

出　　处：《激光与红外》2020年第6期658-667,共10页Laser & Infrared

基　　金：国家自然科学基金项目(No.51376025);湖南省自然科学基金项目(No.2018JJ2442,No.2019JJ40299)资助。

摘　　要：为了能够对汽轮机湿蒸汽各参数的变化进行精准的监测,提高汽轮机内部除湿技术和机组的运行效率,对湿蒸汽参数后向异轴散射测量模型进行了优化和实验研究。基于Mie散射理论建立了湿蒸汽测量模型,对原散射体的几何模型进行优化;通过MATLAB对该模型进行了仿真模拟,计算得到当接收距离d=0.32 m,水滴群质量中间半径r0.5=1μm,尺寸分布参数K=5和水滴数浓度N=2.5×1011时,散射光强值达到最佳。利用相减消光法和均值滤波法对CCD相机信号进行了提取和处理,并对不同工况下的湿蒸汽参数进行了实验测量计算与反演,实验反演的结果和仿真模拟的结果变化趋势吻合。研究结果验证了基于CCD的后向异轴散射测量模型的准确性和测量汽轮机蒸汽湿度实验研究的可行性,为今后的汽轮机蒸汽湿度测量提供了科学依据。In order to accurately monitor the changes of wet steam parameters in steam turbine,and to improve the internal dehumidification technology and unit operation efficiency,a backward non-coaxial scattering model for the measurement of wet steam parameters was optimized and tested so that.Based on the Mie scattering theory,the wet steam measurement model was established,and the geometric model of the original scattered was optimized.The measurement model was simulated by MATLAB,and the results show that the scattered light intensity value is optimal when the receiving distance d=0.32 m,the water droplet mass median radius r0.5=1μm,the size distribution parameter K=5 and the water droplet concentration N=2.5×1011.The CCD camera signals were extracted and processed by a subtractive extinction method and a mean filtering method.The experimental measurement and inversion of wet steam parameters under different working conditions were carried out.The results of experimental inversion and that of simulations have a consistent change trend.The results verify the accuracy of the CCD-based backward non-coaxial scattering measurement model and the feasibility of experimental study on measuring the steam humidity in steam turbine,which provides a scientific basis for future measurement of turbine steam humidity.

关 键 词：后向异轴散射 蒸汽湿度 测量模型 MIE散射理论 CCD 图像处理 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程] TH744[机械工程—光学工程]