咨询与建议

看过本文的还看了

相关文献

该作者的其他文献

文献详情 >Experimental study of Al agglo... 收藏

Experimental study of Al agglomeration on solid propellant burning surface and condensed combustion products

作     者:Cheng-yin Tu Xiong Chen Ying-kun Li Bei-chen Zhang Chang-sheng Zhou Cheng-yin Tu;Xiong Chen;Ying-kun Li;Bei-chen Zhang;Chang-sheng Zhou

作者机构:School of Mechanical EngineeringNanjing University of Science and TechnologyNanjing210094PR China 

出 版 物:《Defence Technology(防务技术)》 (Defence Technology)

年 卷 期:2023年第26卷第8期

页      面:111-122页

核心收录:

学科分类:08[工学] 0805[工学-材料科学与工程(可授工学、理学学位)] 080502[工学-材料学] 

基  金:supported by the National Natural Science Foundation of China (Grant No.52006099) the Fundamental Research Funds of the Central Universities (Grant No.30920021102,No.309181B8812) the Six Talent Peaks Project of Jiangsu Province of China (Grant No.2016-HKHT-017)。 

主  题:Solid propellant Al particles Condensed combustion products Agglomeration Microscopic morphology 

摘      要:Aluminum(Al) particles are commonly added to energetic materials including propellants,explosives and pyrotechnics to increase the overall energy density of the composite,but aluminum agglomeration on the combustion surface may lower the combustion efficiency of propellants,resulting in a loss in twophase flow.Therefore,it is necessary to understand the agglomeration mechanism of aluminum particles on the combustion surface.In this paper,a high-pressure sealed combustion chamber is constructed,and high-speed camera is used to capture the whole process of aluminum accumulation,aggregation and agglomeration on the combustion surface,and the secondary agglomeration process near the combustion surface.The microscopic morphology and chemical composition of the condensed combustion products(CCPs) are then studied by using scanning electron microscopy coupled with energy dispersive(SEM-EDS) method.Results show that there are three main types of condensed combustion products:small smoke oxide particles oxidized by aluminum vapor,usually less than 1 μm;typical agglomerates formed by the combustion of aluminum agglomerates;carbonized agglomerates that are widely distributed,usually formed by irregular movements of aluminum agglomerates.The particle size of condensed combustion products is measured by laser particle size meter.As the pressure increases from 0.5 MPa to 1.0 MPa in nitrogen,the mass average particle size of aluminum agglomerates decreases by 49.7%.As the ambient gas is changed from 0.5 MPa nitrogen to 0.5 MPa air,the mass average particle size of aluminum agglomerates decreases by 67.3%.Results show that as the ambient pressure increases,the higher oxygen content can improve combustion efficiency and reduce the average agglomeration size of aluminum particles.

读者评论 与其他读者分享你的观点

用户名:未登录
我的评分