Propellants, Explosives, Pyrotechnics最新文献_第5页

Numerical simulation and optimized design of a launching system with a novel charge structure 新型装药结构发射系统的数值模拟和优化设计

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-21 DOI: 10.1002/prep.202300326

Zi‐Jun Chen, Hong‐Hao Ma, Qing‐Tao Xu, Ze He, Zhao‐Wu Shen, Lu‐Qing Wang

{"title":"Numerical simulation and optimized design of a launching system with a novel charge structure","authors":"Zi‐Jun Chen, Hong‐Hao Ma, Qing‐Tao Xu, Ze He, Zhao‐Wu Shen, Lu‐Qing Wang","doi":"10.1002/prep.202300326","DOIUrl":"https://doi.org/10.1002/prep.202300326","url":null,"abstract":"In this paper, a launching system with a novel charge structure was proposed to improve the interior ballistic performance. According to the working characteristics of the novel launching system, a lumped‐parameter model was established. The parameters of the propellant and the interior ballistic characteristics of the launching system were obtained by experiments. According to the experimental results, the accuracy of the lumped‐parameter model was verified by code. The simulated results were in good agreement with the experimental results. Based on the lumped‐parameter model, the propellant parameters, such as the impetus, the burning rate, the web thickness, and the charge mass, were investigated to understand the interior ballistic performances of the launching system. An optimization method was proposed to design the propellant parameters of the launching system. The results show that the optimal scheme can increase the velocity of the projectile by 9.54 %. Compared with the traditional launching method, the velocity of the projectile is increased by 37.09 % while the peak pressure in the barrel has no change.","PeriodicalId":20800,"journal":{"name":"Propellants, Explosives, Pyrotechnics","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A model for the combustion behavior of AP/HTPB propellant containing ultrafine aluminum 含超细铝的 AP/HTPB 推进剂燃烧行为模型

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-12 DOI: 10.1002/prep.202400049

Kaixuan Chen, Xiaochun Xue, Yonggang Yu

{"title":"A model for the combustion behavior of AP/HTPB propellant containing ultrafine aluminum","authors":"Kaixuan Chen, Xiaochun Xue, Yonggang Yu","doi":"10.1002/prep.202400049","DOIUrl":"https://doi.org/10.1002/prep.202400049","url":null,"abstract":"Nano‐aluminum, renowned for its remarkable efficacy in augmenting propulsion efficiency and regressive velocity, stands out as a compelling choice for incorporation into heterogeneous propellant compositions. Nevertheless, the considerable expense of this ultrafine aluminum variant, coupled with the inherent hazards associated with conducting propellant trials, may deter extensive allocation of resources and efforts towards the intricate processes of amalgamation, molding, and comprehensive analysis of the combustion characteristics of freshly devised propellant blends. To provide theoretical support for predicting the chemical properties of nano‐Al composite propellant, we establish a numerical framework to study the combustion characteristics under the working environment of a solid rocket motor. A new five‐step kinetic mechanism is developed in this model to describe the reaction process in the gas phase while accounting for heat conduction, radiative effects, and non‐planar moving surfaces. The comparison between our theoretical work and experimental results confirms that making no distinction among Al particle sizes below 3 μm is reasonable. Finally, the effects of nano‐Al on combustion, burning rate variation, and temperature sensitivity are analyzed in detail.","PeriodicalId":20800,"journal":{"name":"Propellants, Explosives, Pyrotechnics","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141353114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Batch synthesis of 2,4,6‐trinitro‐3‐bromoanisole and its thermolysis and combustion performance 批量合成 2,4,6-三硝基-3-溴苯甲醚及其热解和燃烧性能

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-05-30 DOI: 10.1002/prep.202400009

Xiao‐lan Song, Yi Wang, Kang‐hui Jia, Zhi‐hong Yu, Dan Song, Chong‐wei An, Feng‐sheng Li

{"title":"Batch synthesis of 2,4,6‐trinitro‐3‐bromoanisole and its thermolysis and combustion performance","authors":"Xiao‐lan Song, Yi Wang, Kang‐hui Jia, Zhi‐hong Yu, Dan Song, Chong‐wei An, Feng‐sheng Li","doi":"10.1002/prep.202400009","DOIUrl":"https://doi.org/10.1002/prep.202400009","url":null,"abstract":"A new carrier explosive TNBA was batch synthesized by a chemical method. The prepared samples were characterized using SEM, EDS, XRD, IR, XPS, nuclear magnetic resonance, and elemental analysis techniques. The enthalpy of formation of TNBA was measured using a specialized calorimeter that is specially used in testing of explosives and powders. The thermal decomposition performance of TNBA was tested by DSC technology. Meanwhile, the combustion performance of TNBA was also tested. The results of characterizations showed that the prepared sample was indeed TNBA. The enthalpy of formation of TNBA was determined as ΔHf,TNBA=+48.5 kJ/mol. At a heating rate of 20 °C/min, the thermal decomposition peak of TNBA is at TP=285.3 °C, and the activation energy is EK=91 kJ/mol, which is higher than the Tp and EK values of TNT. This indicates that TNBA is a relatively easy to decompose explosive, but the decomposition rate is not fast. The critical temperature for thermal explosion of TNBA reached Tb=247 °C, which is higher than the Tb value of TNT, slightly lower than the Tb value of DNAN, and significantly higher than the Tb value of DNTF, TNAZ, and MTNP. The combustion performance test results showed that the TNBA sample has the highest combustion pressure and the highest pressurization rate; and the TNBA sample has the highest combustion temperature; however, due to the high oxygen balance, the combustion heat of TNBA samples in excess pure oxygen is not the highest.","PeriodicalId":20800,"journal":{"name":"Propellants, Explosives, Pyrotechnics","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141195517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Activation and reaction mechanism of nano‐aluminized explosives under shock wave 纳米铝炸药在冲击波下的活化和反应机理

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-05-30 DOI: 10.1002/prep.202300318

Zhandong Wang, Chuan Xiao, Fang Chen, Shuang Wang, Liangliang Zhang, Qingzhao Chu

{"title":"Activation and reaction mechanism of nano‐aluminized explosives under shock wave","authors":"Zhandong Wang, Chuan Xiao, Fang Chen, Shuang Wang, Liangliang Zhang, Qingzhao Chu","doi":"10.1002/prep.202300318","DOIUrl":"https://doi.org/10.1002/prep.202300318","url":null,"abstract":"To investigate the effect of aluminum (Al) nanoparticles on the energy release mechanism of high explosives, a comprehensive analysis was conducted on the mechanical response and chemical reaction mechanism of pure 1,3,5‐Trinitro‐1,3,5‐triazinane (RDX) and nano‐aluminized RDX across varying particle velocities using molecular dynamics simulation. The simulation results show that the velocity of the shock wave which is formed in the explosive increases as the velocity of the particle increases. Notably, detonation was absent when the particle velocity was below 3 km/s, but prominently observed beyond this threshold, accompanied by a diminishing delay in reaction time for aluminum particles as particle velocity increased. After detonation, a localized pressure reduction behind aluminum particles was observed, elucidating the diminished detonation efficacy of aluminized explosives. Furthermore, the introduction of aluminum particles led to a deceleration in the RDX reaction rate, with the emergence of aluminum atomic clusters highlighting previously overlooked gas‐phase reactions that necessitate inclusion in detonation modeling for aluminized explosives.","PeriodicalId":20800,"journal":{"name":"Propellants, Explosives, Pyrotechnics","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141195516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanism of hot‐spot formation of emulsion explosives sensitized by hydrogen‐storage glass microballoons 储氢玻璃微球敏化乳化炸药热点形成的机理

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-05-30 DOI: 10.1002/prep.202300335

Yixin Wang, Honghao Ma, Zhaowu Shen, Jiping Chen

{"title":"Mechanism of hot‐spot formation of emulsion explosives sensitized by hydrogen‐storage glass microballoons","authors":"Yixin Wang, Honghao Ma, Zhaowu Shen, Jiping Chen","doi":"10.1002/prep.202300335","DOIUrl":"https://doi.org/10.1002/prep.202300335","url":null,"abstract":"In order to investigate the primary factors influencing hot‐spot formation in emulsion explosives sensitized by hydrogen‐storage glass microballoons (GMBs), we conducted impact calculations on hydrogen‐storage GMBs. The calculations focused on tracking two main mechanisms: the brittle collapse of GMBs and the adiabatic compression of internal gas. Various parameters were considered, including loading pressures, initial porosities, gas types, and initial gas pressures. Our findings indicate that the contribution of brittle collapse to hot‐spot formation is negligible, while adiabatic compression emerges as the predominant intrinsic mechanism for hot‐spot ignition in GMB‐sensitized emulsion explosives. Moreover, we observed that the ignition time remains similar for low‐pressure nitrogen and high‐pressure hydrogen. The addition of hydrogen does not result in an increased number of hot‐spots; however, it elevates the energy of each individual hot‐spot, thereby enhancing power delivery. Optimal selection of GMB size is crucial for hot‐spot formation and hydrogen storage. GMBs that are excessively large are prone to shell breakage, while overly small GMBs have limited hydrogen storage capacity. GMBs within the size range of 20 μm to 100 μm are deemed more suitable for emulsion explosives.","PeriodicalId":20800,"journal":{"name":"Propellants, Explosives, Pyrotechnics","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141195518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Future Articles: Prop., Explos., Pyrotech. Prop., Explos., Pyrotech. 6/2024 未来文章：道具、爆炸物、烟火技术Prop.6/2024

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-05-18 DOI: 10.1002/prep.202480599

引用次数: 0

Cover Picture: (Prop., Explos., Pyrotech. 5/2024) 封面图片：（道具、爆炸、烟火 5/2024）

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-05-18 DOI: 10.1002/prep.202480501

引用次数: 0

Contents: Prop., Explos., Pyrotech. 5/2024 内容：Prop.5/2024

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-05-18 DOI: 10.1002/prep.202480511

引用次数: 0

Forthcoming Meetings: Prop., Explos., Pyrotech. 5/2024 即将召开的会议：Prop.5/2024

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-05-18 DOI: 10.1002/prep.202480598

引用次数: 0

Trinitroethyl hydrazides of dicarbonic acids – Energetic compounds with high oxygen and nitrogen content 二碳酸的三硝基乙基酰肼--含氧量和含氮量高的高能化合物

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-05-13 DOI: 10.1002/prep.202300266

Thomas M. Klapötke, Burkhard Krumm, Christian Riedelsheimer

引用次数: 0