Study on thermal response characteristics of encased propellants under laser irradiation
The laser safety of small and medium-sized flying units, exemplified by missiles, is crucial for ensuring their operational stability. In this regard, the response process of an encased propellant system comprising PBT propellant, stainless steel shell, and thermal insulation layer (EPDM) was meticu...
Main Authors: | , , , , , , |
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Format: | Article |
Language: | English |
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Elsevier
2023-11-01
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Series: | Case Studies in Thermal Engineering |
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Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X23008146 |
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author | Yi-min Luo Fu-nao Sang Shun-yao Wang Lin Jiang Mi Li Sen Xu Fei-yang Xu |
author_facet | Yi-min Luo Fu-nao Sang Shun-yao Wang Lin Jiang Mi Li Sen Xu Fei-yang Xu |
author_sort | Yi-min Luo |
collection | DOAJ |
description | The laser safety of small and medium-sized flying units, exemplified by missiles, is crucial for ensuring their operational stability. In this regard, the response process of an encased propellant system comprising PBT propellant, stainless steel shell, and thermal insulation layer (EPDM) was meticulously captured during laser irradiation. The temperature distribution within the shell and insulation layer was determined through high-speed infrared thermography and finite element calculation. Results show that at a laser heat flux density of 2100 W/cm2, when the contact surface of the propellant reaches its ignition temperature, introducing a 1 mm insulation layer allows dissipation of 48.6-60.1% of the heat in the 0.5-1.6 mm shell beyond the laser irradiation range, significantly higher than the 3.1-12.2% observed without thermal insulation. Simultaneously, the ignition delay time increases from 0.45-0.75 s to 1.31-14.46 s. Theoretical calculations and experimental results confirm that replacing a portion of the shell with a thermal insulation layer achieves a lower heating rate of propellant with a thinner overall thickness, resulting in a longer ignition delay time. These findings have practical implications for enhancing the resistance of thin-shell targets, like rocket engines, against laser weapon interception. |
first_indexed | 2024-03-11T21:34:42Z |
format | Article |
id | doaj.art-4a3171bbfef2475db31124fad3f4c527 |
institution | Directory Open Access Journal |
issn | 2214-157X |
language | English |
last_indexed | 2024-03-11T21:34:42Z |
publishDate | 2023-11-01 |
publisher | Elsevier |
record_format | Article |
series | Case Studies in Thermal Engineering |
spelling | doaj.art-4a3171bbfef2475db31124fad3f4c5272023-09-27T04:43:01ZengElsevierCase Studies in Thermal Engineering2214-157X2023-11-0151103508Study on thermal response characteristics of encased propellants under laser irradiationYi-min Luo0Fu-nao Sang1Shun-yao Wang2Lin Jiang3Mi Li4Sen Xu5Fei-yang Xu6School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Jiangsu, Nanjing, 210094, ChinaShanghai Research Institute of Chemical Industry, Shanghai, 200062, ChinaSchool of Mechanical Engineering, Nanjing University of Science and Technology, Jiangsu, Nanjing, 210094, ChinaSchool of Mechanical Engineering, Nanjing University of Science and Technology, Jiangsu, Nanjing, 210094, ChinaSchool of Mechanical Engineering, Nanjing University of Science and Technology, Jiangsu, Nanjing, 210094, ChinaSchool of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Jiangsu, Nanjing, 210094, China; China National Quality Inspection and Testing Center for Industrial Explosive Materials, Nanjing, 210094, China; Corresponding author. School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Jiangsu, Nanjing, 210094, China.School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Jiangsu, Nanjing, 210094, China; Corresponding author.The laser safety of small and medium-sized flying units, exemplified by missiles, is crucial for ensuring their operational stability. In this regard, the response process of an encased propellant system comprising PBT propellant, stainless steel shell, and thermal insulation layer (EPDM) was meticulously captured during laser irradiation. The temperature distribution within the shell and insulation layer was determined through high-speed infrared thermography and finite element calculation. Results show that at a laser heat flux density of 2100 W/cm2, when the contact surface of the propellant reaches its ignition temperature, introducing a 1 mm insulation layer allows dissipation of 48.6-60.1% of the heat in the 0.5-1.6 mm shell beyond the laser irradiation range, significantly higher than the 3.1-12.2% observed without thermal insulation. Simultaneously, the ignition delay time increases from 0.45-0.75 s to 1.31-14.46 s. Theoretical calculations and experimental results confirm that replacing a portion of the shell with a thermal insulation layer achieves a lower heating rate of propellant with a thinner overall thickness, resulting in a longer ignition delay time. These findings have practical implications for enhancing the resistance of thin-shell targets, like rocket engines, against laser weapon interception.http://www.sciencedirect.com/science/article/pii/S2214157X23008146Laser safetyEncased propellantIgnition delay timeTemperature distributionInfrared thermal imaging |
spellingShingle | Yi-min Luo Fu-nao Sang Shun-yao Wang Lin Jiang Mi Li Sen Xu Fei-yang Xu Study on thermal response characteristics of encased propellants under laser irradiation Case Studies in Thermal Engineering Laser safety Encased propellant Ignition delay time Temperature distribution Infrared thermal imaging |
title | Study on thermal response characteristics of encased propellants under laser irradiation |
title_full | Study on thermal response characteristics of encased propellants under laser irradiation |
title_fullStr | Study on thermal response characteristics of encased propellants under laser irradiation |
title_full_unstemmed | Study on thermal response characteristics of encased propellants under laser irradiation |
title_short | Study on thermal response characteristics of encased propellants under laser irradiation |
title_sort | study on thermal response characteristics of encased propellants under laser irradiation |
topic | Laser safety Encased propellant Ignition delay time Temperature distribution Infrared thermal imaging |
url | http://www.sciencedirect.com/science/article/pii/S2214157X23008146 |
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