Combustion crack-network reaction evolution model for highly-confined explosives
The evolution behavior of combustion crack reaction of highly confined solid explosives after non-shock ignition is governed by multiple dynamic processes, including intrinsic combustion of explosives, crack propagation, and rapid growth of combustion surface area. Here, the pressure increase can ac...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-08-01
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| Series: | Defence Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214914722001416 |
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| author | Zhuo-ping Duan Meng-Jing Bai Zhi-ling Bai Xin-jie Wang Feng-lei Huang |
| author_facet | Zhuo-ping Duan Meng-Jing Bai Zhi-ling Bai Xin-jie Wang Feng-lei Huang |
| author_sort | Zhuo-ping Duan |
| collection | DOAJ |
| description | The evolution behavior of combustion crack reaction of highly confined solid explosives after non-shock ignition is governed by multiple dynamic processes, including intrinsic combustion of explosives, crack propagation, and rapid growth of combustion surface area. Here, the pressure increase can accelerate the combustion rate of explosives, and the crack propagation can enlarge the combustion surface area. The coupling between these two effects leads to the self-enhanced combustion of explosive charge system, which is the key mechanism for the reaction development after ignition. In this study, combustion crack-network (CCN) model is established to describe the evolution of combustion crack reaction of highly confined solid explosives after non-shock ignition and quantify the reaction violence. The feasibility of the model is verified by comparing the computational and experimental results. The results reveal that an increase in charge structure size causes an increase in the time of crack pressurization and extension of cracks due to the high temperature-generated gas flow and surface combustion during the initial stage of explosive reaction, but when the casing is fractured, the larger the charge structure, the more violent the late reaction and the larger the charge reaction degree. The input pressure has no obvious influence on the final reaction violence. Further, a larger venting hole area leads to better pressure relief effect, which causes slower pressure growth inside casing. Larger reserved ullage volume causes longer low-pressure induction stage, which further restrains the internal pressure growth. Furthermore, the stronger the casing constraint, the more rapid the self-enhanced combustion of the high temperature-generated gas, which results in more violent charge reaction and larger charge reaction degree during casing break. Overall, the proposed model can clarify the effects of intrinsic combustion rate of explosives, charge structure size, input pressure, relief area, ullage volume, and constraint strength on the reaction evolution, which can provide theoretical basis for violence evaluation and safety design for ammunition under accident stimulus. |
| first_indexed | 2024-03-12T11:53:10Z |
| format | Article |
| id | doaj.art-1116b859624646cfabe374a4683aa28b |
| institution | Directory Open Access Journal |
| issn | 2214-9147 |
| language | English |
| last_indexed | 2024-03-12T11:53:10Z |
| publishDate | 2023-08-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Defence Technology |
| spelling | doaj.art-1116b859624646cfabe374a4683aa28b2023-08-31T05:02:53ZengKeAi Communications Co., Ltd.Defence Technology2214-91472023-08-01265467Combustion crack-network reaction evolution model for highly-confined explosivesZhuo-ping Duan0Meng-Jing Bai1Zhi-ling Bai2Xin-jie Wang3Feng-lei Huang4State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, ChinaCorresponding author.; State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, ChinaCorresponding author.; State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, ChinaThe evolution behavior of combustion crack reaction of highly confined solid explosives after non-shock ignition is governed by multiple dynamic processes, including intrinsic combustion of explosives, crack propagation, and rapid growth of combustion surface area. Here, the pressure increase can accelerate the combustion rate of explosives, and the crack propagation can enlarge the combustion surface area. The coupling between these two effects leads to the self-enhanced combustion of explosive charge system, which is the key mechanism for the reaction development after ignition. In this study, combustion crack-network (CCN) model is established to describe the evolution of combustion crack reaction of highly confined solid explosives after non-shock ignition and quantify the reaction violence. The feasibility of the model is verified by comparing the computational and experimental results. The results reveal that an increase in charge structure size causes an increase in the time of crack pressurization and extension of cracks due to the high temperature-generated gas flow and surface combustion during the initial stage of explosive reaction, but when the casing is fractured, the larger the charge structure, the more violent the late reaction and the larger the charge reaction degree. The input pressure has no obvious influence on the final reaction violence. Further, a larger venting hole area leads to better pressure relief effect, which causes slower pressure growth inside casing. Larger reserved ullage volume causes longer low-pressure induction stage, which further restrains the internal pressure growth. Furthermore, the stronger the casing constraint, the more rapid the self-enhanced combustion of the high temperature-generated gas, which results in more violent charge reaction and larger charge reaction degree during casing break. Overall, the proposed model can clarify the effects of intrinsic combustion rate of explosives, charge structure size, input pressure, relief area, ullage volume, and constraint strength on the reaction evolution, which can provide theoretical basis for violence evaluation and safety design for ammunition under accident stimulus.http://www.sciencedirect.com/science/article/pii/S2214914722001416Solid explosivesNon-shock ignitionSelf-enhanced combustionCombustion crack-network (CCN) modelRelief areaReaction degree |
| spellingShingle | Zhuo-ping Duan Meng-Jing Bai Zhi-ling Bai Xin-jie Wang Feng-lei Huang Combustion crack-network reaction evolution model for highly-confined explosives Defence Technology Solid explosives Non-shock ignition Self-enhanced combustion Combustion crack-network (CCN) model Relief area Reaction degree |
| title | Combustion crack-network reaction evolution model for highly-confined explosives |
| title_full | Combustion crack-network reaction evolution model for highly-confined explosives |
| title_fullStr | Combustion crack-network reaction evolution model for highly-confined explosives |
| title_full_unstemmed | Combustion crack-network reaction evolution model for highly-confined explosives |
| title_short | Combustion crack-network reaction evolution model for highly-confined explosives |
| title_sort | combustion crack network reaction evolution model for highly confined explosives |
| topic | Solid explosives Non-shock ignition Self-enhanced combustion Combustion crack-network (CCN) model Relief area Reaction degree |
| url | http://www.sciencedirect.com/science/article/pii/S2214914722001416 |
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