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...

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Main Authors: Yi-min Luo, Fu-nao Sang, Shun-yao Wang, Lin Jiang, Mi Li, Sen Xu, Fei-yang Xu
Format: Article
Language:English
Published: Elsevier 2023-11-01
Series:Case Studies in Thermal Engineering
Subjects:
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.
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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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