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Detonation flame temperature measurement system and three-dimensional temperature field reconstruction method

A flame temperature and measurement system technology, which is applied to the temperature measurement of the motor, the temperature measurement of the moving fluid, the application of the thermometer, etc., can solve the problem of the reflection of sound waves, the inability to study the characteristics of the temperature field in the combustion chamber, and the characteristics of the overall temperature distribution of the combustion chamber Measurement and other issues

Inactive Publication Date: 2017-01-04
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, due to the harsh environment in the combustion chamber, the exit noise is very loud, and the sound waves will be reflected, so the temperature distribution at the exit of the combustion chamber cannot be accurately measured.
Moreover, this method only measures the outlet temperature of the combustion chamber, and cannot study the characteristics of the temperature field in the combustion chamber.
Therefore, the methods described in the literature are difficult to accurately measure the overall temperature distribution characteristics of the combustion chamber in harsh environments

Method used

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  • Detonation flame temperature measurement system and three-dimensional temperature field reconstruction method
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Embodiment Construction

[0040] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0041] The steps of the detonation flame image temperature measurement method are as follows:

[0042] Step 1: Construction of the detonation test bench. refer to figure 1 , for a certain pulse detonation engine prototype, install 20 microphones and speakers in a certain space in the detonation combustion chamber (the speakers and microphones together form a sound wave sensor), and connect the computer through a data acquisition card; The sound wave temperature measurement software system sends out a digital sound wave signal, which is converted into an analog signal by the sound card, then amplified and output by the power amplifier, and reaches one end of the relay switch. Digital I / O output high level, this high level is drawn out from the terminal board connected with the data acquisition card, through the control signal cable to start the relay, connect th...

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Abstract

The invention relates to a detonation flame temperature measurement system and a three-dimensional temperature field reconstruction method. Detonation combustion chamber temperature fields of the same position are measured by using a certain number of acoustic sensors and loudspeakers. The data are analyzed, and then accurate time delay estimation can still be obtained by using the cross correlation technology under the condition of low signal-to-noise ratio. The correlation algorithm based on cepstrum processing is researched for combustion chamber environment reverberation interference so as to enhance the precision of time delay estimation. Then the temperature field in the pulse detonation engine combustion chamber is reconstructed by using a regional discrete method based on an LSQR (least squares QR-Decomposition) algorithm in MATLAB.

Description

technical field [0001] This paper relates to a method for measuring the distribution of combustion temperature field, especially the method for measuring the temperature field of detonation combustion chamber, which belongs to the field of combustion diagnosis. Background technique [0002] The document "Research on Temperature Distribution Measurement of Aircraft Engine Combustion Chamber Outlet Based on Acoustic Wave Sensor, Journal of Shenyang Aeronautical Industry Institute, Vol.26, No.2" discloses a method for measuring the temperature distribution of aeroengine combustion chamber outlet based on acoustic wave sensor. This method first uses multiple acoustic sensors to measure the time it takes for the sound wave to fly through the temperature field, and then obtains the average temperature of the propagation path from the relationship between the sound wave propagation velocity and the medium temperature, and then uses the computer tomography method based on the least s...

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Application Information

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IPC IPC(8): G01K11/22G01K13/02G01K13/024
CPCG01K11/22G01K13/02G01K2205/04G01K13/024
Inventor 黄希桥王苗苗李前翔冯翔洲郑龙席
Owner NORTHWESTERN POLYTECHNICAL UNIV
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