异轴角散射法测量湿蒸气参量的方法研究  

Research of measurement of wet steam parameters with off-axis angular scattering method

作　　者：杨颖[1] 黄竹青[1,2] 曹小玲[1] 

机构地区：[1]长沙理工大学能源与动力工程学院,长沙410114 [2]湖南有色金属职业技术学院,株洲412006

出　　处：《激光技术》2014年第3期316-320,共5页Laser Technology

基　　金：湖南省科技厅重点基金资助项目(2011GK4005)

摘　　要：为了实时监测汽轮机末级湿蒸气中水滴大小分布和浓度的变化,指导汽轮机的安全经济运行和锅炉给水量,减小湿蒸气对汽轮机的影响,提出了一种以CCD为探测器、测量湿蒸气参量的异轴角散射方法;根据模拟汽缸的结构和参量建立数学模型,并进行了仿真分析,得出水滴群质量中间半径、水滴数浓度和尺度分布参量的变化对散射比的影响规律;分别对不同工况下的湿蒸气进行了实验测量;仿真和实验结果变化趋势基本一致。结果表明,利用异轴角散射法测量湿蒸气参量变化是可行的。该研究对湿蒸气参量以及其它微粒的监测是有帮助的。In order to monitor the density and distribution of water-drop at the end stage of the steam turbine , the off-axis angular scattering method was proposed to measure the parameters of wet steam .In this way , it not only guides economic operation of the turbine but also guarantee water allowance of the boiler .At the same time , it can reduce the influence of wet steam on the turbine .Based on the structure and parameters of mock cylinder , a mathematic model was built.This mathematic model can find whether the middle radius of quantity , the density of number and the distribution of magnitude in water-drop have impact on the scattering ratio .The wet steam was measured under different conditions .The analysis result was similar to the experimental result .The experimental results proved the off-axis angular scattering method is feasible for measuring wet steam parameters .This research is helpful for monitoring the parameters of wet steam and other particles.

关 键 词：散射 湿蒸气参量 异轴角散射法 CCD 灰度值 

分 类 号：O436.2[机械工程—光学工程]