Application of fast inversion algorithm in measurement of steam humidity of steam turbine

LIU Fangyan; HUANG Zhuqing; CAO Xiaoling; CAI Cheng; YANG Ying

doi:10.7510/jgjs.issn.1001-3806.2014.03.023

LASER TECHNOLOGY > 2014 > 38(3): 389-393. > DOI: 10.7510/jgjs.issn.1001-3806.2014.03.023

LIU Fangyan, HUANG Zhuqing, CAO Xiaoling, CAI Cheng, YANG Ying. Application of fast inversion algorithm in measurement of steam humidity of steam turbine[J]. LASER TECHNOLOGY, 2014, 38(3): 389-393. DOI: 10.7510/jgjs.issn.1001-3806.2014.03.023

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Application of fast inversion algorithm in measurement of steam humidity of steam turbine

1.
School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha 410114, China;
2.
Hunan Nonferrous Metals Vocational and Technical College, Zhuzhou 412006, China

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Received Date: May 26, 2013
Revised Date: June 20, 2013
Published Date: May 24, 2014

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Abstract

In order to solve the problem confronted with the online steam humidity measurement of turbine flow pass, a semi-empirical formula of phase function computing method was proposed to improve the inversion algorithm on scattering light distribution. Phase function of double Gaussian fitting by using MATLAB with cftool was adopted in this algorithm. The fitting result shows that the relative error is in small, and the approximate analytic solution of the Mie scattering theory could be got by the fitting function, which means that a rapid inversion from the scattering light intensity distribution to water quality radius. According to the results, with the restriction of the range of the droplet size, the approximation of the theory between the droplet size and scattering ratio was got. Contrast experiment showed the measured scattering ratio was similar with the simulated scattering ratio. Based on the semi-empirical model, the water quality of middle radius was 1.1μm.The fast inversion algorithm can well resolve the online measurement of steam humidity.
- scattering,
- water quality middle radius,
- double Gaussian fitting,
- turbine

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