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A high-precision test method for film cooling efficiency based on pressure-sensitive varnish

A technology of film cooling and testing method, which can be used in measurement devices, material excitation analysis, instruments, etc., and can solve problems such as measurement error of film cooling efficiency

Active Publication Date: 2021-03-09
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stimulated light intensity of pressure-sensitive paint is essentially temperature-dependent, so the difference in surface temperature of the model between windy and non-windy conditions and the uneven distribution of surface temperature in the same state will lead to measurement errors in film cooling efficiency

Method used

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  • A high-precision test method for film cooling efficiency based on pressure-sensitive varnish
  • A high-precision test method for film cooling efficiency based on pressure-sensitive varnish
  • A high-precision test method for film cooling efficiency based on pressure-sensitive varnish

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] A test method for high-precision film cooling efficiency based on pressure-sensitive paint, using two-component pressure-sensitive paint for testing, mainly includes the following steps:

[0083] Step S1: adding a reference illuminant that is not sensitive to oxygen concentration to the pressure-sensitive paint coating; the two-component pressure-sensitive paint mainly includes an oxygen-sensitive luminous body and a reference luminous body that is not sensitive to oxygen;

[0084] Step S2: Obtain the corresponding relationship between light intensity and oxygen partial pressure after eliminating the influence of model surface temperature difference on light intensity; thus, the film cooling efficiency value can be calculated.

[0085] Such as figure 1 As shown, the principle of air film cooling is to introduce cooling air from one or more discrete holes on the surface of the high-temperature component, and the cooling air flow is ejected from the inside of the high-tem...

Embodiment 2

[0104] This embodiment is further optimized on the basis of Embodiment 1, and also includes the following steps:

[0105] Step S3: Obtain four color images under different working conditions of the object to be measured. The four color images are respectively a black image without light and no flow, an oxygen pressure sensitive reference image with light and no flow, and a An image of oxygen pressure-sensitive air injection with mainstream, light, and air injection, and an image of oxygen pressure-sensitive nitrogen injection with mainstream, light, and nitrogen injection;

[0106] Step S4: image processing to obtain 8 radiation intensity images of illuminants sensitive to oxygen partial pressure and radiation intensity images of reference illuminants insensitive to oxygen partial pressure under different working conditions;

[0107] In the step S4, the color image collected in the step S3 is processed by an algorithm, and decomposed into a red light image of a luminous body s...

Embodiment 3

[0116] This embodiment is further optimized on the basis of Embodiment 2. In the step S6, the adiabatic film cooling efficiency is calculated. When a carbon dioxide jet is used, M c = M co2 =44, M air =29, density ratio DR=1.52, can obtain the formula of the adiabatic film cooling efficiency when carrying out experiment with carbon dioxide:

[0117]

[0118] The present invention proposes for the first time the method of measuring the air film cooling efficiency by using a two-component pressure sensitive paint coating to eliminate the influence of the temperature factor on the measurement accuracy when measuring the air film cooling efficiency of the existing pressure sensitive paint coating, thereby discharging the influence of the temperature on the experimental results The impact of the test improves the test accuracy and has better practicability.

[0119] Other parts of this embodiment are the same as those of Embodiment 2 above, so details are not repeated here.

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Abstract

The invention discloses a test method for high-precision air film cooling efficiency based on pressure-sensitive paint, which adopts two-component pressure-sensitive paint for testing, and adds a reference illuminant that is insensitive to oxygen concentration in the pressure-sensitive paint; the The two-component pressure-sensitive paint mainly includes a luminous body that is sensitive to oxygen and a reference luminous body that is not sensitive to oxygen; obtain the corresponding relationship between the light intensity and the oxygen partial pressure after eliminating the influence of the surface temperature difference of the model on the light intensity; thus, it can be calculated Film cooling efficiency value. The invention eliminates the influence of temperature parameters through the comparison of the illuminant and the reference illuminant, thereby eliminating the systematic error of the measurement method caused by the temperature change; the invention adopts the two-component test for the first time in the test of the cooling efficiency of the gas film The method can effectively improve the measurement accuracy of the experiment, and has good innovation and practicability.

Description

technical field [0001] The invention belongs to the technical field of testing air film cooling efficiency of pressure sensitive paint, and in particular relates to a high-precision testing method of air film cooling efficiency based on pressure sensitive paint. Background technique [0002] Film cooling is a cooling method used in gas turbines since the 1970s, and has become one of the main cooling methods for high-temperature components of modern gas turbines. The working principle of air film cooling is to introduce cooling air from one or more discrete holes on the surface of high-temperature components, and the cooling air is ejected from the inside of the high-temperature components to form a layer of cooling air film on the surface of the blade, separating the high-temperature gas from the metal surface. Open, thereby greatly reducing the heat transfer of the gas to the metal surface. [0003] At present, the method of measuring the film cooling efficiency of the hot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/63G01N21/84
CPCG01N21/63G01N21/8422
Inventor 黄康吴军强马护生王红彪刘祥
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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