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Development of measurement technique of explosive flame using an optical measurement method

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Abstract

It is essential in weapons systems to understand how much explosive power is applied according to various chemicals and methods of the explosion. In particular, to measure dynamic thermal phenomena and analyze thermal properties under high-temperature and high-pressure conditions. Although many researchers have used thermocouples to measure the temperature during an explosion, this method has an error in the temperature measurement as the radiant heat flux increases. Another measurement method is needed to solve this problem. During an explosion in a shock tube, the temperature change was measured with a thermocouple and a pressure sensor. To solve the limitations of the thermocouple’s measurement responsiveness in temperature measurement was compared with the TDLD (tunable diode laser detection) method. In the case of the TDLD method, the time to reach the peak was measured an average 0.0207 sec faster than the thermocouple. Moreover, the peak average temperature was 15.8 °C higher than that of the thermocouple.

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Abbreviations

I t :

Intensity of the transmitted light

I in :

Intensity of the incident light

A λ :

Spectral absorbance

Λ:

Wavelength

V :

Wavenumber at the line-center

S i,j :

Line-strength

G vi,j :

Line-broadening function

H :

Planck’s constant

K :

Boltzmann’s constant

E :

Net current flowing through the diode

E 0 :

“Dark saturation current”, the diode leakage current density in the absence of light

V :

Applied voltage across the terminals of the diode

E :

Absolute value of electron charge

T :

Absolute temperature (K)

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Acknowledgments

This research was supported by Creative Challenge Program through the National Research Foundation of Korea (NRF) funded by the Korea Government (No. 2020R1I1A1A 01052771). Further, this has been also supported by “The Preliminary Core Technology Project: Measurement for Dynamic Thermal Phenomena and Analysis for Thermal Characteristics under the High Temperature and Pressure Conditions” funded by Agency for Defense Development.

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Correspondence to Min-Gyu Jeon.

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Min-Gyu Jeon earned his B.S. and M.S. degrees in the Refrigeration, Air-conditioning Eng. at Korea Maritime & Ocean Univ. (KMOU) in 2012 and 2014, respectively. He received his Ph.D. degree in the Dept. of Mech. Eng. in Tokushima Univ., Japan, in 2018. He is currently a Research Professor in the Div. of Mech. Eng. at KMOU. His research interest includes the areas of fundamentals of combustion, and flow visualizations in industry and marine and off-shore machinery.

Jeong-Woong Hong earned his B.S. degree in the Industrial Eng. at Hongik Univ. in 2017. He is currently a graduate student in the Refrigeration, Air-conditioning Eng. at Korea Maritime & Ocean Univ. His research interest includes the areas of fundamentals of combustion, and flow visualizations in industry and marine and off-shore machinery.

Kyoungmin Kim earned his combined M.S. and Ph.D. degrees in the Dept. of Mechanical Eng. at Hanyang University in 2014. He is currently a Senior Researcher at Agency for Defense Development in Korea. His main interests are in areas of test and evaluation design for weaponry system.

Deog-Hee Doh earned his B.S. and M.S. degrees in the Dept. of Marine Eng. at Korea Maritime & Ocean Univ. (KMOU) in 1985 and 1988, respectively. He received his Ph.D. degree in the Dept. of Mech. Eng. in Tokyo Univ., Japan, in 1995. He is currently a President at KMOU. His main interests are in the areas of flow visualizations in industry and marine and offshore machinery.

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Jeon, MG., Hong, JW., Kim, K. et al. Development of measurement technique of explosive flame using an optical measurement method. J Mech Sci Technol 34, 5109–5115 (2020). https://doi.org/10.1007/s12206-020-1114-3

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  • DOI: https://doi.org/10.1007/s12206-020-1114-3

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