Method of collecting radiation information of turbine blade

Patent metadata

Field	Value
Publication number	US-10670464-B2
Application number	US-201815871033-A
Country	US
Kind code	B2
Filing date	Jan 14, 2018
Priority date	Jun 30, 2017
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A method of collecting radiation information of a turbine blade, the method including: 1) collecting a radiated light from the surface of the turbine blade, analyzing the radiated light using a spectrometer to calculate compositions and corresponding concentrations of combustion gas; 2) calculating an absorption coefficient of the combustion gas at different concentrations; 3) calculating a total absorption rate of the combustion gas at different radiation wavelengths under different concentrations of component gases; 4) obtaining a relationship between the radiation and a wavelength; 5) finding at least 3 bands with a least gas absorption rate; 6) calculating a distance between a wavelength of a strongest radiation point of the turbine blade and the center wavelength, and selecting three central wavelengths closest to the wavelength with the strongest radiation; and 7) acquiring radiation data of the turbine blade in the windows obtained in 6).

First claim

The invention claimed is:

1. A method of collecting radiation information of a turbine blade, wherein the turbine blade is rotated due to the expansion of a combustion gas and the turbine blade is heated to a temperature by the combustion gas, the method comprising:
1) collecting light radiated from a surface of the turbine blade, analyzing the light radiated from the surface of the turbine blade using a spectrometer and determining gas components of the combustion gas and respective concentrations of the gas components, and looking up absorptivities N of the gas components at various wavelengths within a wavelength range in an HITEMP spectral database;
2) calculating an absorption coefficient of the gas components at the respective concentrations of the gas components according to the formula: a=K×ECL+b, wherein a is the absorption coefficient at the concentration of a gas component, K,b are constant factors, E is a relative cross-sectional area of the combustion gas which represents a light-sensitive area of the spectrometer, C is the concentration of the gas component, and L is an optical path length which represents a distance that the light radiated from the surface of the turbine blade propagates in the combustion gas;
3) calculating a total absorption rate of the combustion gas at the various wavelengths under the respective concentrations of the gas components using the following

A
=

∑
i

⁢

(

a
i

*

N
i

)

,

A=Σ i (a i *N), formula wherein a i represents an absorption coefficient of an i th gas component, N i represents an absorptivity of the i th gas component, and i is a serial number of a gas component;
4) calculating a radiance of the light radiated from the surface of the turbine blade at the various wavelengths using the formula:

M
⁡

(

λ
,
T

)

=

ɛ
·

C
1

λ
5

⁢

1

exp
⁡

(

C
2

λ
⁢

⁢
T

)

-
1

,

wherein M(λ,T) represents the radiance when a wavelength is λ and the temperature is T, ε is a radiation coefficient, and C 1 , C 2 are first and second radiation constants; and drawing a curve illustrating a relationship between the total absorption rate obtained in 3), the radiance and the wavelength at a coordinate system;
5) selecting at least 3 bands that comprise smallest total absorption rates with respect to other bands within the wavelength range from the curve obtained in 4), and calculating a center wavelength of each band;
6) calculating an absolute difference between a strongest-radiance wavelength and each center wavelength obtained in 5), and selecting a first center wavelength that has the smallest absolute difference with respect to other center wavelengths, a second center wavelength that has the second smallest absolute difference with respect to other center wavelengths, and a third center wavelength that has the third smallest absolute difference with respect to other center wavelengths; wherein a first band comprising the first center wavelength, a second band comprising the second center wavelength, and a third band comprising the third center wavelength are data acquisition windows of the turbine blade; and the turbine blade has a strongest radiance at the strongest-radiance wavelength within the wavelength range; and
7) acquiring radiation data of the turbine blade in the windows obtained in 6).

Assignees

• Univ Electronic Sci & Tech China

Inventors

• Wang Chao
• Duan Ying
• Hu Jun
• Zhang Zezhan
• Yang Yang
• Gou Xueke
• Wang Fei
• Jiang Jing
• Lv Jinguang
• Wang Yueming
• Jiang Hongchuan
• Du Li
• Ding Jiexiong
• Liang Jingqiu
• Liu Xianfu
• Shi Xiaojiang
• Xiong Bing

Classifications

• F05D2270/303

  Temperature · CPC title

• F01D21/003

  Arrangements for testing or measuring (for measuring vibrations G01H) · CPC title

• G01J5/0088 Primary

  in turbines · CPC title

• F05D2270/804

  Optical devices · CPC title

• F01D17/02

  Arrangement of sensing elements · CPC title