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火烧迹地朽木燃烧和热解的烟密度 预览
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作者 蒋婷 罗静 +2 位作者 张桥蓉 王昆伦 李世友 《消防科学与技术》 CAS 北大核心 2019年第7期926-928,共3页
为了解火烧迹地朽木燃烧和热解的烟密度特性,用JCY-2型建材烟密度测定仪对滇中地区13种朽木与相近尺寸的正常材进行了烟密度实验测定,根据曲线分析和计算了各样品的最大烟密度、达到最大烟密度时间、产烟起始时间、变化最快时间、总产... 为了解火烧迹地朽木燃烧和热解的烟密度特性,用JCY-2型建材烟密度测定仪对滇中地区13种朽木与相近尺寸的正常材进行了烟密度实验测定,根据曲线分析和计算了各样品的最大烟密度、达到最大烟密度时间、产烟起始时间、变化最快时间、总产烟量。研究表明,13种朽木烟密度等级与最大烟密度呈正相关,朽木烟密度等级小于正常材烟密度等级的有5种,朽木烟密度等级大于正常材烟密度等级的有8种。 展开更多
关键词 朽木 燃烧 火烧迹地 烟密度 热解
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Evolution in physiochemical and cloud condensation nuclei activation properties of crop residue burning particles during photochemical aging
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作者 Yan Ma Chao Chen +4 位作者 Junfeng Wang Youling Jiang Zewen Zheng Hui Chen Jun Zheng 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第3期43-53,共11页
As a main form of biomass burning in agricultural countries, crop residue burning is a significant source of atmospheric fine particles. In this study, the aging of particles emitted from the burning of four major cro... As a main form of biomass burning in agricultural countries, crop residue burning is a significant source of atmospheric fine particles. In this study, the aging of particles emitted from the burning of four major crop residues in China was investigated in a smog chamber.The particle size distribution, chemical composition and cloud condensation nuclei(CCN)activity were simultaneously measured. The properties of crop residue burning particles varied substantially among different fuel types. During aging, the particle size and mass concentration increased substantially, suggesting condensational growth by formation of secondary aerosols. The particle composition was dominated by organics. Aging resulted in considerable enhancement of organics and inorganics, with enhancement ratios of 1.24–1.44 and 1.33–1.76 respectively, as well as a continuous increase in the oxidation level of organics. Elevated CCN activity was observed during aging, with the hygroscopicity parameter κ varying from 0.16 to 0.34 for fresh particles and 0.19 to 0.40 for aged particles.Based on the volume mixing rule, the hygroscopicity parameter of organic components(κorg) was derived. κorgexhibited an increasing tendency with aging, which was generally consistent with the tendency of the O:C ratio, indicating that the oxidation level was related to the hygroscopicity and CCN activity of organic aerosols from crop residue burning. Our results indicated that photochemical aging could significantly impact the CCN activation of crop burning aerosols, not only by the production of secondary aerosols, but also by enhancing the hygroscopicity of organic components, thereby contributing to the aerosol indirect climate forcing. 展开更多
关键词 Crop residue BURNING AGING Cloud CONDENSATION NUCLEI activity HYGROSCOPICITY Organic aerosol
20CrMnTi钢渗碳齿轮表面裂纹形成原因
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作者 杨金艳 赵灵杰 成亚维 《金属热处理》 CAS CSCD 北大核心 2019年第6期215-219,共5页
采用现代分析手段对20CrMnTi渗碳齿轮表面裂纹形成原因进行了分析。发现裂纹沿晶界分布,且裂纹两侧存在脱碳现象,裂纹内侧通过能谱分析存在大量氧、硫元素。裂纹两侧组织为呈网状条块铁素体+高碳细小回火组织,基体组织为回火马氏体组织... 采用现代分析手段对20CrMnTi渗碳齿轮表面裂纹形成原因进行了分析。发现裂纹沿晶界分布,且裂纹两侧存在脱碳现象,裂纹内侧通过能谱分析存在大量氧、硫元素。裂纹两侧组织为呈网状条块铁素体+高碳细小回火组织,基体组织为回火马氏体组织,边缘渗碳处的组织为高碳细小回火组织。结果表明:20CrMnTi钢渗碳齿轮表面裂纹形成的主要原因是锻造过程中加热温度太高而过烧,由过烧形成的熔洞以及未熔化的低熔点化合物使晶粒与晶粒之间结合力降低,一经锻打便会碎裂。这种由过烧引起的熔洞与裂纹,再次淬火加热过程中,受到热应力的作用下,进一步扩展成断断续续的裂纹。 展开更多
关键词 齿轮 20CRMNTI钢 渗碳 过烧 裂纹
Seasonal variations of PM10 -- Trace elements, PAHs and Levoglucosan: Rural sugarcane growing area versus coastal urban area in Southeastern Florida, USA. Part II: Elemental concentrations
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作者 Orhan Sevim oglu Wolfgang F. Rogge 《颗粒学报:英文版》 SCIE EI CAS CSCD 2019年第5期99-108,共10页
The largest sugarcane-growing area in the United States is in South Florida. An estimated 7 million tons of dry sugarcane leafy biomass is removed from the fields before harvest by burning the leaves off the sugarcane... The largest sugarcane-growing area in the United States is in South Florida. An estimated 7 million tons of dry sugarcane leafy biomass is removed from the fields before harvest by burning the leaves off the sugarcane stalks. Preharvest sugarcane leaf foliage burning is a major source of airborne particulate matter (PM), polycyclic aromatic hydrocarbons (PAHs), biogenic trace elements such as K, volatile hydrocarbons and other pollutants. In one harvesting period, approximately 22 million tons of C02, a greenhouse gas, is released, 7 million tons from leaf foliage preharvest burning alone and 15 million tons from burning sugarcane bagasse in the sugar mills for power generation. In this study, PMio was collected from Belle Glade, close to the sugarcane-growing area, and from Delray Beach, an urbanized area along the East Coast of Florida. The PM samples were analyzed for trace elements and close to organic compounds. To elucidate the importance of preharvest sugarcane biomass smoke emissions on air quality, 39 trace elements, 18 PAHs, and levoglucosan were selected to apportion ambient PM constituents. Al, Ca and to a great extend also Mg are the major soil-related trace elements and key markers for fugitive soil dust emissions. Similarly, sea salt aerosol blown from the Atlantic Ocean into Florida added appreciably to PMio trace elements concentration, especially Na and Cl. Approximately half of the sea salt aerosol (PMjo -portion) by mass is removed from the atmosphere during the transport of ocean air from Delray Beach to Belle Glade. Ambient acid displacement reactions caused a substantial portion of the Cl (30%) to be liberated from the sea salt aerosol to the atmosphere during transport as gaseous HC1. The PAH concentrations at Belle Glade were high when the biomass combustion markers levoglucosan and I< also showed the highest concentrations. This indicates that during the sugarcane harvest season, when leaf foliage is burned off just before harvest, most of the ambient PAHs associated with PMio are indeed 展开更多
关键词 Urban VERSUS RURAL Trace ELEMENTS SUGARCANE burning Rare earth ELEMENTS Sea salt aerosol Potassium LEVOGLUCOSAN PAHS
炼厂地面火炬和高架火炬配置的研究
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作者 张新国 耿书林 赵彦良 《辽宁化工》 CAS 2019年第4期374-376,共3页
随着山东省实施新旧动能转化、产业转型升级迈出新步伐,东营联合石化有限公司(以下简称联合石化)为响应政府号召积极推进芳烃高端化工项目,从而伴随着新增生产装置及部分原有装置增扩,在保证装置系统运行平稳、安全和保护环境原则下,通... 随着山东省实施新旧动能转化、产业转型升级迈出新步伐,东营联合石化有限公司(以下简称联合石化)为响应政府号召积极推进芳烃高端化工项目,从而伴随着新增生产装置及部分原有装置增扩,在保证装置系统运行平稳、安全和保护环境原则下,通常设置火炬系统对生产运行各种工况下的火炬气作燃烧处理。火炬设计中必须对处理能力、设计方案、热辐射情况等环节进行详细计算,根据本厂的各个生产装置事故工况下(开停工、火灾、停电、停水、误操作等)排放的可燃性气体排放量不同,决定分别设置地面火炬和高架火炬。 展开更多
关键词 燃烧 火炬 生产装置 热辐射
Narrative Focalization of William Faulkner’s Barn Burning 预览
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作者 韩新宇 《海外英语》 2019年第6期202-206,共5页
Barn Burning is a short story written by William Faulkner, which first appeared in 1939 and has since been widely read. The story guides readers to observe the world through a 10-year-old boy, Sarty’s point of view, ... Barn Burning is a short story written by William Faulkner, which first appeared in 1939 and has since been widely read. The story guides readers to observe the world through a 10-year-old boy, Sarty’s point of view, at the same time, the continual intervening of omniscient narrator breaks through the restrictions of Sarty’s subjective point of view. Faulkner’s use of multiple points of view makes the novel hard to understand. In order to better appreciate Barn Burning, analysis of the use of multiple points of view with the help of Gerard Genette’s focalization theory is necessary. Moreover, the application of Wayne Booth’s ideas of implied author and discussion of Sarty’s narrative reliability are also presented. Hopefully, it can help readers form a good habit of narrative thinking and understand the novel in a better way. 展开更多
关键词 WILLIAM FAULKNER BARN BURNING focalization implied AUTHOR NARRATIVE reliability
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旋流燃烧器冷态空气动力场试验研究 预览
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作者 丛日成 刘娟 +2 位作者 邹天舒 冷杰 梁明文 《东北电力技术》 2019年第5期23-27,44共6页
详细阐述了一种旋流燃烧器冷态空气动力场测量方法及专属测量仪器的使用方法。通过该仪器进行旋流燃烧器冷态空气动力场试验能够了解燃烧器射流的流体动力特性、射流扩散角、旋流燃烧器回流区的大小及位置,了解旋流燃烧器特性,以便在锅... 详细阐述了一种旋流燃烧器冷态空气动力场测量方法及专属测量仪器的使用方法。通过该仪器进行旋流燃烧器冷态空气动力场试验能够了解燃烧器射流的流体动力特性、射流扩散角、旋流燃烧器回流区的大小及位置,了解旋流燃烧器特性,以便在锅炉启动后解决燃烧器严重结渣、烧损、灰渣可燃物含量高、燃烧稳定性差等问题。 展开更多
关键词 锅炉 燃烧 旋流燃烧器 冷态空气动力场 回流区 流场
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高锌压铸ADC12ZS合金性能的研究
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作者 杨兴国 《特种铸造及有色合金》 CAS 北大核心 2019年第1期38-41,共4页
针对目前的再生铝行业需求,旨在研究一种Zn含量不高于2.5%的ADC12ZS铝合金。通过分析,相比于ADC12合金,ADC12ZS高温热脆性趋势增加,热裂倾向更大;熔炼过程中烧损严重,铝液耗损率大。铝锭制备时通过控制Zn元素的组织形式可以避免压铸的... 针对目前的再生铝行业需求,旨在研究一种Zn含量不高于2.5%的ADC12ZS铝合金。通过分析,相比于ADC12合金,ADC12ZS高温热脆性趋势增加,热裂倾向更大;熔炼过程中烧损严重,铝液耗损率大。铝锭制备时通过控制Zn元素的组织形式可以避免压铸的高温热脆性。严格控制炉料清洁度、比面积和除渣剂用量,适当提高加热速度,缩短熔炼时间,控制好炉内O2浓度,有利于降低铝液烧损率以及含渣量。 展开更多
关键词 铝合金 热脆性 烧损 含渣量 熔炼
化肥塑料编织袋灼烧残渣率的测定方法 预览
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作者 王传化 《云南化工》 CAS 2019年第4期78-79,共2页
介绍了一种化肥塑料编织袋灼烧残渣率的测定方法。样品通过灰化、灼烧得到残渣,最后计算出残渣率,以此作为衡量化肥塑料编织袋质量指标之一。
关键词 塑料编织袋 灼烧 残渣率
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聚丙烯腈基碳纤维灰分测试灰化时间探索 预览
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作者 丁月里 丁光强 +4 位作者 张新伟 徐明媚 Ruiqin Song Yujuan Nie Yang Liu 《化工管理》 2019年第18期38-39,共2页
文章研究了12种国内外碳纤维在900℃下灼烧灰化时间,探索灰化恒重首次称量时间及达到恒重的时间。结果表明:900℃下需要用马弗炉灼烧4h以后可以对碳纤维首次称重,5h达到恒重。
关键词 聚丙烯腈基碳纤维 灰分 热失重 灼烧
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Aerosol light absorption in a coastal city in Southeast China:Temporal variations and implications for brown carbon
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作者 Yuqing Qiu Xin Wu +5 位作者 Yanru Zhang Lingling Xu Youwei Hong Jinsheng Chen Xiaoqiu Chen Junjun Deng 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第6期257-266,共10页
Light-absorbing carbonaceous aerosols including black carbon(BC) and brown carbon(BrC)play significant roles in atmospheric radiative properties. One-year measurements of aerosol light absorption at multi-wavelength w... Light-absorbing carbonaceous aerosols including black carbon(BC) and brown carbon(BrC)play significant roles in atmospheric radiative properties. One-year measurements of aerosol light absorption at multi-wavelength were continuously conducted in Xiamen,southeast of China in 2014 to determine the light absorption properties including absorption coefficients(σabs) and absorption ?ngstr?m exponent(AAE) in the coastal city.Light absorptions of BC and BrC with their contributions to total light absorption were further quantified. Mean σabsat 370 nm and 880 nm were 56.6 ± 34.3 and 16.5 ± 11.2 Mm-1,respectively. σabspresented a double-peaks diurnal pattern with the maximum in the morning and the minimum in the afternoon. σabswas low in warm seasons and high in cold seasons. AAE ranged from 0.26 to 2.58 with the annual mean of 1.46, implying that both fossil fuel combustion and biomass burning influenced aerosol optical properties. σabsof BrC at 370 nm was 24.0 ± 5.7 Mm-1, contributing 42% to the total absorption. The highest AAE(1.52 ± 0.02) and largest BrC contributions(47% ± 4%) in winter suggested the significant influence of biomass burning on aerosol light absorption. Long-distance air masses passing through North China Plain and the Yangtze River Delta led to high AAE and BrC contributions. High AAE value of 1.46 in July indicated that long-range transport of the air pollutants from intense biomass burning in Southeast Asia would affect aerosol light absorption in Southeast China. The study will improve the understanding of light absorption properties of aerosols and the optical impacts of BrC in China. 展开更多
关键词 LIGHT ABSORPTION BROWN CARBON Black CARBON ABSORPTION ANGSTROM exponent Biomass burning Western Taiwan STRAIT
管式炉燃烧-滴定法快速测定硅铁中碳硫含量 预览
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作者 王娇 王雨童 《广州化工》 CAS 2019年第8期92-94,共3页
对管式炉燃烧-滴定法测定硅铁中碳硫进行了研究。采用氧化铜为助熔剂,在1350℃管式燃烧炉中通氧燃烧,产生的二氧化硫、二氧化碳分别用过氧化氢和乙醇-乙醇胺进行吸收,用氢氧化钠滴定硫,用乙醇-氢氧化钾溶液滴定碳。方法应用于硅铁标准... 对管式炉燃烧-滴定法测定硅铁中碳硫进行了研究。采用氧化铜为助熔剂,在1350℃管式燃烧炉中通氧燃烧,产生的二氧化硫、二氧化碳分别用过氧化氢和乙醇-乙醇胺进行吸收,用氢氧化钠滴定硫,用乙醇-氢氧化钾溶液滴定碳。方法应用于硅铁标准物质碳硫的测定,三种硅铁标准物质碳含量测定结果的标准偏差RSD均不大于4%,硫含量测定结果的标准偏差RSD均不大于9%。证明该方法能快速,准确,简便的测定硅铁中碳硫含量。 展开更多
关键词 管式炉 燃烧 滴定法 硅铁 碳硫
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Burning rate and other characteristics of strontium titanate (SrTiO3) supplemented AP/HTPB/Al composite propellants 预览
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作者 Sunil Jain Garima Gupta +2 位作者 Dhirendra R. Kshirsagar Vrushali H. Khire Balasubramanian Kandasubramanian 《Defence Technology(防务技术)》 CAS CSCD 2019年第3期313-318,共6页
In a quest of search for a new burning rate modifier for composite propellant, strontium titanate (SrTiO3), a perovskite oxide has been chosen for evaluation in a composite propellant formulation based on its other ca... In a quest of search for a new burning rate modifier for composite propellant, strontium titanate (SrTiO3), a perovskite oxide has been chosen for evaluation in a composite propellant formulation based on its other catalytic applications. Initially, SrTiO3 was characterized for particle size, morphology and material/ phase identification (using XRD). By varying SrTiO3 content in a standard composite propellant, different compositions were prepared and their performance and processing parameters like the end of mix (EOM) viscosity, mechanical properties, density, burning rate, pressure exponent (n-value), etc. were measured. The results reveal that 2% SrTiO3 causes more than 12% enhancement in propellant burning rate (at 70 ksc pressure) in comparison to the standard propellant composition. The pressure exponent also increases to 0.46, whereas the standard composition was having its value as 0.35. 展开更多
关键词 STRONTIUM TITANATE AMMONIUM PERCHLORATE Composite PROPELLANT Burning rate
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煤矸石燃烧过程中汞的释放规律及其动力学研究 预览
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作者 曹艳芝 郭少青 +1 位作者 高丽兵 卫贤贤 《矿业安全与环保》 北大核心 2019年第2期6-9,共4页
我国煤矸石电厂的装机量已达30000MW,煤矸石电厂排放的汞对环境造成的污染不容忽视。为了建立和完善汞控制技术的理论基础,对煤矸石燃烧过程中汞的释放规律及其动力学进行了系统研究,结果表明:随着层燃温度的升高和停留时间的延长,煤矸... 我国煤矸石电厂的装机量已达30000MW,煤矸石电厂排放的汞对环境造成的污染不容忽视。为了建立和完善汞控制技术的理论基础,对煤矸石燃烧过程中汞的释放规律及其动力学进行了系统研究,结果表明:随着层燃温度的升高和停留时间的延长,煤矸石中汞的释放率逐渐增大;汞释放规律符合一级动力学方程,1^#、2^#煤矸石中汞释放反应的活化能E分别为25.25、18.77kJ/mol,频率因子A分别为0.796、0.189min^-1。 展开更多
关键词 煤矸石 燃烧 汞释放 释放率 动力学 活化能
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Characterization of multiphase gas–solid flow and accuracy of turbulence models for lower stage cyclones used in suspension preheaters
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作者 Marek Wasilewski Stanislaw Anweiler Maciej Masiukiewicz 《中国化学工程学报:英文版》 CSCD 2019年第7期1618-1629,共12页
This study involved the analysis and characterization of the multiphase flow phenomenon inside the lower stage cyclone separator used in the clinker burning process.The analysis was performed using both CFD and experi... This study involved the analysis and characterization of the multiphase flow phenomenon inside the lower stage cyclone separator used in the clinker burning process.The analysis was performed using both CFD and experimental research methods.Very few studies are devoted to such types of cyclone separators,which in addition to their basic functions are also responsible for the technological process.Due to the atypical working conditions of these cyclone separators,they are characterized with a complex geometry,which significantly differs from that of the traditional separators.Furthermore,the evaluation of the accuracy and level of reliability of the two models of turbulence closure—k-e RNG and RSM(RANS),and the LES.The results obtained led to the conclusion that for the lower stage cyclone separators,the LES model proved to be the most accurate(both in the case of forecasting the separation efficiency and pressure drop).The performance parameter(in particular the separation efficiency)values obtained for the RSM model were also characterized by high accuracy.The k-e RNG model was characterized by significantly larger deviations. 展开更多
关键词 CYCLONE SEPARATORS Separation MULTIPHASE flow CFD Pressure DROP CLINKER burning
燃烧蜡烛水中悬浮现象的研究 预览
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作者 寻之朋 李川南 +1 位作者 梁汉普 周渝涵 《大学物理》 2019年第5期39-44,共6页
对燃烧蜡烛在水中悬浮的机理进行了理论与实验探究.通过建立近似垂直井结构模型,从辐射能流的角度对蜡烛的整个燃烧过程进行了理论分析.并且从实验上探究了蜡烛长度、蜡烛半径、以及配重对于蜡烛悬浮过程的影响.最后还对其振动模式进行... 对燃烧蜡烛在水中悬浮的机理进行了理论与实验探究.通过建立近似垂直井结构模型,从辐射能流的角度对蜡烛的整个燃烧过程进行了理论分析.并且从实验上探究了蜡烛长度、蜡烛半径、以及配重对于蜡烛悬浮过程的影响.最后还对其振动模式进行了分析. 展开更多
关键词 蜡烛 燃烧 悬浮
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新型多功能洁净火焰发生器的设计 预览
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作者 贾泽春 《热处理》 CAS 2019年第4期28-32,共5页
原有的在锅炉和热处理炉上试用的卧式旋风燃烧器,是将风、煤混合物直接喷入燃烧室在旋风中燃烧,但经常发生跑火、漏风等故障。为此,将这种卧式旋风燃烧改进为立式悬浮环流垂线燃烧。成功设计了多功能洁净火焰发生器,包括进、出火口和燃... 原有的在锅炉和热处理炉上试用的卧式旋风燃烧器,是将风、煤混合物直接喷入燃烧室在旋风中燃烧,但经常发生跑火、漏风等故障。为此,将这种卧式旋风燃烧改进为立式悬浮环流垂线燃烧。成功设计了多功能洁净火焰发生器,包括进、出火口和燃烧室的计算和参数选定,钝体和一、二、三次风管的计算和参数选定,进风机、引风机和水泵参数的选定,悬浮除渣腔展开长度的计算等。新设计的火焰发生器消除了卧式切线进风式火焰发生器结渣、积灰及排渣不畅等缺陷,具有安全、环保和节能等特点。 展开更多
关键词 煤粉 燃烧 节能
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机械加工零件表面烧伤的金相检验 预览
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作者 焦丽 赵英军 徐向阳 《热处理》 CAS 2019年第4期39-43,共5页
高碳钢淬硬件和渗碳淬硬件等在磨削时,会由于磨削工艺不当,如磨削余量过大、冷却不充分或砂轮选用不当等,产生烧伤,不仅降低零件的表面硬度,严重时还会产生裂纹,甚至导致零件报废。此外,线切割加工也会使零件发生烧伤。零件的烧伤实质... 高碳钢淬硬件和渗碳淬硬件等在磨削时,会由于磨削工艺不当,如磨削余量过大、冷却不充分或砂轮选用不当等,产生烧伤,不仅降低零件的表面硬度,严重时还会产生裂纹,甚至导致零件报废。此外,线切割加工也会使零件发生烧伤。零件的烧伤实质上与过大的磨削热或线切割热使零件表层达到高温而发生相转变产生变质层有关,可根据这一点采取防止零件发生烧伤的措施。 展开更多
关键词 磨削 线切割 烧伤 热处理
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生石灰改性燃料对其燃烧及烧结过程NO_x排放的影响
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作者 甘牧原 韦振宁 +3 位作者 石楚刚 刘华 朱梦飞 春铁军 《钢铁研究学报》 CAS CSCD 北大核心 2019年第9期816-821,共6页
为了从源头实现铁矿烧结NO_x减排,采用燃料燃烧及烧结杯实验,使用烧结用生石灰改性燃料,研究生石灰改性用量(生石灰与燃料质量比)对燃料燃烧过程N转化率和NO_x排放量(每克燃料燃烧排放NO_x的质量)的影响。结果表明,在0~3.0%(质量分数)... 为了从源头实现铁矿烧结NO_x减排,采用燃料燃烧及烧结杯实验,使用烧结用生石灰改性燃料,研究生石灰改性用量(生石灰与燃料质量比)对燃料燃烧过程N转化率和NO_x排放量(每克燃料燃烧排放NO_x的质量)的影响。结果表明,在0~3.0%(质量分数)的范围内,随着生石灰改性用量提高,燃料燃烧N转化率及NO_x排放量降低,烧结过程NO_x平均浓度降低。当生石灰改性用量超过3.0%(质量分数)时,NO_x减排效率有所降低。结合烧结指标综合考虑,适宜生石灰改性用量为1.0%~3.0%。 展开更多
关键词 改性燃料 燃烧 铁矿烧结 NO_x减排
Effects of Plasticizers,Antioxidants and Burning Rate Modifiers on Aging Performance of the HTPB/HMDI Composite Solid Propellant 预览
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作者 Ahmed M Enew Ehab Abadir +1 位作者 Sahar Elmarsafy Karim K Elsharkawy 《含能材料》 EI CAS CSCD 北大核心 2019年第1期21-27,90共8页
The effects of plasticizers,antioxidants and burning rate modifiers on the aging performance of the composite solid propellant based on hydroxyl‐terminated polybutadiene(HTPB)/hexamethylene diisocyanate(HMDI)were exp... The effects of plasticizers,antioxidants and burning rate modifiers on the aging performance of the composite solid propellant based on hydroxyl‐terminated polybutadiene(HTPB)/hexamethylene diisocyanate(HMDI)were explored by applying an accelerated aging program for 90 day at 70℃.The HTPB propellant matrix with the diisooctyl sebacate(DOS)as plasticizers and diisooctyl azelate(DOZ),antioxidants as N,N′‐Diphenyl‐p‐phenylenediamine(AO)and 2,2′‐methylenebis(4‐methyl‐6‐tert‐butylphenol)(cyanox 2246)and burning rate modifiers as barium ferrite(BF),copper chromites(CC)and ferric oxide(FO)were varied.Results show that sample(S1)which based on DOS decreases the stress value and increases the strain value which considered to be an excellent start for aging program.Sample(S3)containing AO presents the higher resistance to oxidation showing the better performance that reflects on increasing the shelf life of the composite solid propellant mo‐tor.Sample(S5)which based on BF enhances the ballistic performance among over the other tested two samples.The accelerated aging program allowed us to estimate the motor in‐service lifetime. 展开更多
关键词 polybutadiene(HTPB)/hexamethylene diisocyanate(HMDI)composite solid PROPELLANT plasticizers ANTIOXIDANTS burning rate MODIFIERS aging program
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