Application of colorimetric pyrometer in the measurement of transient explosion temperature

ZHANG Qiwei; CHENG Yangfan; XIA Yu; WANG Zhonghua; WANG Quan; SHEN Zhaowu

doi:10.11883/bzycj-2021-0477

Volume 42 Issue 11

Nov. 2022

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Article Navigation > Explosion And Shock Waves > 2022 > 42(11): 114101

ZHANG Qiwei, CHENG Yangfan, XIA Yu, WANG Zhonghua, WANG Quan, SHEN Zhaowu. Application of colorimetric pyrometer in the measurement of transient explosion temperature[J]. Explosion And Shock Waves, 2022, 42(11): 114101. doi: 10.11883/bzycj-2021-0477

Citation:

ZHANG Qiwei, CHENG Yangfan, XIA Yu, WANG Zhonghua, WANG Quan, SHEN Zhaowu. Application of colorimetric pyrometer in the measurement of transient explosion temperature[J]. Explosion And Shock Waves, 2022, 42(11): 114101. doi: 10.11883/bzycj-2021-0477

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Application of colorimetric pyrometer in the measurement of transient explosion temperature

doi: 10.11883/bzycj-2021-0477

1.
School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China
2.
School of Engineering Science, University of Science and Technology of China, Hefei 230027, Anhui, China

Received Date: 2021-11-15
Rev Recd Date: 2021-11-22

Available Online: 2022-11-01

Publish Date: 2022-11-18

Abstract

Abstract

To study the distribution law of transient explosion temperature field, a high-speed two-dimensional temperature measuring system according to the colorimetric temperature measurement principle was constructed using a high-speed camera, the gray-body radiation principle, Bayer array of the image sensor, and a self-compiled python code. The relationship between the gray value of high-speed camera image and explosion temperature was deduced. And the Bayer filter of the image sensor was used to obtain the intensity information of red, green, and blue light on each pixel, which was calculated through Python code with the edge adaptive interpolation algorithm. A tungsten filament lamp was selected as the temperature source for calibration. The explosion temperature fields of emulsion explosives with different TiH₂ powder contents, TiH₂ dust, and C₂H₂ gas were measured by the system. The experimental results show that the addition of TiH₂ powders could significantly increase the explosion temperature and fireball duration of emulsion explosives. When the mass content of TiH₂ powders in emulsion explosive is 6%, the maximum average temperature of the explosion is 3048 K, a 41.5% increase than that of pure emulsion explosive. In addition, the average flame temperature of the TiH₂ dust cloud increases first, then stabilizes, and finally decreases. The mean flame temperature of the 500 g/m³ dust is higher than that of 833 g/m³ dust, with the corresponding maximum mean temperatures of 2231 and 2192 K, respectively. The early flame temperature distribution of the premixed 10% C₂H₂/90% air was uniform, with the internal temperature slightly lower than the edge temperature. As the flame expands, the flame edge temperature gradually increases, while the average flame temperature begins to decrease, and the maximum average temperature is 2523 K. Compared with the traditional explosion temperature measurement method, the colorimetric pyrometer method can accurately measure the transient explosion temperature in a certain region and obtain the temperature distribution cloud map, which provided a new technical means for studying transient detonation temperature and its influencing factors.
- colorimetric pyrometer,
- explosion temperature field,
- dust explosion,
- emulsion explosive,
- gas explosion

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