Effects of particle size and content of RDX on burning stability of RDX-based propellants
Particle size and content of RDX are the two main factors that affect the burning stability of RDX-based propellants. However, these effects and the corresponding mechanisms are still controversial. In this work, we investigated the physicochemical processes during burning and the corresponding mech...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2022-07-01
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| Series: | Defence Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214914721000878 |
| _version_ | 1811322882289041408 |
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| author | Bin-bin Wang Xin Liao Luigi T. DeLuca Wei-dong He |
| author_facet | Bin-bin Wang Xin Liao Luigi T. DeLuca Wei-dong He |
| author_sort | Bin-bin Wang |
| collection | DOAJ |
| description | Particle size and content of RDX are the two main factors that affect the burning stability of RDX-based propellants. However, these effects and the corresponding mechanisms are still controversial. In this work, we investigated the physicochemical processes during burning and the corresponding mechanisms through the technologies of structure compactness analysis on the base of voidage measurement and theoretical interfacial area estimation, apparent burning rate measurement using closed vessel (CV) and extinguished burning surface characterization relying on interrupted closed vessel (ICV) and scanning electron microscope (SEM). The results indicate that the voidage increased with the increase of RDX content and particle size due to the increasing interfacial area and increasing interface gap size, respectively. The apparent burning rate increased with the increase of RDX particle size because of the decreasing RDX specific surface area on the burning surface, which could decrease the heat absorbing rates of the melting and evaporation processes of RDX in the condensed phase. Similarly, the apparent burning rate decreased with the increase of RDX content at pressures lower than around 55 MPa due to the increasing RDX specific surface area. Whereas, an opposite trend could be observed at pressures higher than around 55 MPa, which was attributed to the increasing heat feedback from the gas phase as the result of the increasing propellant energy. For propellants containing very coarse RDX particles, such as 97.8 and 199.4 μm average size, the apparent burning rate increased stably with a flat extinguished surface at pressures lower than around 30 MPa, while increased sharply above around 30 MPa with the extinguished surface becoming more and more rugged as the pressure increased. In addition, the turning degree of u-p curve increased with the increase of coarse RDX content and particle size, and could be reduced by improving the structure compactness. |
| first_indexed | 2024-04-13T13:44:04Z |
| format | Article |
| id | doaj.art-f4cb4b90e25c42c08926d87c9f06ee2a |
| institution | Directory Open Access Journal |
| issn | 2214-9147 |
| language | English |
| last_indexed | 2024-04-13T13:44:04Z |
| publishDate | 2022-07-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Defence Technology |
| spelling | doaj.art-f4cb4b90e25c42c08926d87c9f06ee2a2022-12-22T02:44:33ZengKeAi Communications Co., Ltd.Defence Technology2214-91472022-07-0118712471256Effects of particle size and content of RDX on burning stability of RDX-based propellantsBin-bin Wang0Xin Liao1Luigi T. DeLuca2Wei-dong He3School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; Key Laboratory of Special Energy Materials, Ministry of Education, Nanjing, 210094, China; Corresponding author. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, ChinaSchool of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; Key Laboratory of Special Energy Materials, Ministry of Education, Nanjing, 210094, ChinaSPLab, Department of Aerospace Engineering, Politecnico di Milano (RET), Milan, I-20156, ItalySchool of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; Key Laboratory of Special Energy Materials, Ministry of Education, Nanjing, 210094, ChinaParticle size and content of RDX are the two main factors that affect the burning stability of RDX-based propellants. However, these effects and the corresponding mechanisms are still controversial. In this work, we investigated the physicochemical processes during burning and the corresponding mechanisms through the technologies of structure compactness analysis on the base of voidage measurement and theoretical interfacial area estimation, apparent burning rate measurement using closed vessel (CV) and extinguished burning surface characterization relying on interrupted closed vessel (ICV) and scanning electron microscope (SEM). The results indicate that the voidage increased with the increase of RDX content and particle size due to the increasing interfacial area and increasing interface gap size, respectively. The apparent burning rate increased with the increase of RDX particle size because of the decreasing RDX specific surface area on the burning surface, which could decrease the heat absorbing rates of the melting and evaporation processes of RDX in the condensed phase. Similarly, the apparent burning rate decreased with the increase of RDX content at pressures lower than around 55 MPa due to the increasing RDX specific surface area. Whereas, an opposite trend could be observed at pressures higher than around 55 MPa, which was attributed to the increasing heat feedback from the gas phase as the result of the increasing propellant energy. For propellants containing very coarse RDX particles, such as 97.8 and 199.4 μm average size, the apparent burning rate increased stably with a flat extinguished surface at pressures lower than around 30 MPa, while increased sharply above around 30 MPa with the extinguished surface becoming more and more rugged as the pressure increased. In addition, the turning degree of u-p curve increased with the increase of coarse RDX content and particle size, and could be reduced by improving the structure compactness.http://www.sciencedirect.com/science/article/pii/S2214914721000878RDX particle Size and contentStructure compactnessApparent burning rateExtinguished surfaceBurning stability |
| spellingShingle | Bin-bin Wang Xin Liao Luigi T. DeLuca Wei-dong He Effects of particle size and content of RDX on burning stability of RDX-based propellants Defence Technology RDX particle Size and content Structure compactness Apparent burning rate Extinguished surface Burning stability |
| title | Effects of particle size and content of RDX on burning stability of RDX-based propellants |
| title_full | Effects of particle size and content of RDX on burning stability of RDX-based propellants |
| title_fullStr | Effects of particle size and content of RDX on burning stability of RDX-based propellants |
| title_full_unstemmed | Effects of particle size and content of RDX on burning stability of RDX-based propellants |
| title_short | Effects of particle size and content of RDX on burning stability of RDX-based propellants |
| title_sort | effects of particle size and content of rdx on burning stability of rdx based propellants |
| topic | RDX particle Size and content Structure compactness Apparent burning rate Extinguished surface Burning stability |
| url | http://www.sciencedirect.com/science/article/pii/S2214914721000878 |
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