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李亚裕 《导弹与航天运载技术》1999,(1):20-27
着重论述空间环境中电磁辐射、粒子辐射、宇宙尘撞击、零重力、高真空等因素对液体推进剂的影响及消减这些空间环境影响的技术途径,为液体推进剂系统的设计加工提供了技术参考。 相似文献
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吸热型碳氢燃料的研究进展 总被引:14,自引:0,他引:14
吸热型碳氢燃料是实现高超音速飞行的首选燃料,从燃料的选择、催化剂的筛选、热沉的测定、复合结焦抑制剂的开发等方面展开论述了国内外的研究进展,并提出今后的研究方向. 相似文献
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新型绿色液体推进剂研究进展 总被引:1,自引:0,他引:1
对近年来国内外出现的新型绿色(无毒、对环境友好)液体推进剂进行了评述。硝酸羟铵基单组元推进剂具有冰点低、密度比冲高、安全无毒的特点,适用于小卫星和上面级,催化分解技术还有待深入研究;二硝酰胺铵基单组元推进剂比冲高于硝酸羟胺基单元推进剂,发动机脉冲工作能力可与无水肼发动机相媲美,但目前发动机预热温度和燃烧室温度都过高;高浓度过氧化氢/醇基推进剂比冲为常规推进剂比冲的93%,密度比冲为102%;过氧化氢/叠氮胺类不但密度比冲高,而且可实现自燃;一氧化二氮基双组元推进剂在微推进系统中有广泛的应用前景;原子推进剂以其优良的比冲性能将给航天运载器带来革命性的飞跃,但对低温技术提出了挑战。 相似文献
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Synthesis and crystal structure of a nitrogen-rich compound: 3,5-diazido-1,2,4-triazole 总被引:1,自引:0,他引:1
The compound of 3,5-diazido-1,2,4-triazole was synthesized by the reaction of 2,5,2',5'-tetrachloro-1,1'-azo-1,3,4-triazole with sodium azide at 50 ℃.Its crystal structure was determined by single-crystal X-ray diffraction.It crystallizes in monoclinic,space group Cc with a=1.212 4(2) nm,b=2.342 4(5) nm,c=0.804 74(16) nm,β=125.56(3)°,V=1.859 3(6) nm3,Z=4,C2HN9,Mr=151.04,Dc=1.62 g/cm3,F(000)=912 and μ(MoKa)=0.129 mm-1,the final R=0.039 7 and wR=0.087 4.X-ray analysis indicates a stronger intermolecular hydrogen bonding,leading to the formation of a trimmer,containing a nine-membered cyclic ring with graph-set R33(9) in the compound. 相似文献
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A series of oxidation reactions of hexabenzylhexaazaisowurtzitane (HBIW, 1) were studied. Compound 1 was treated with potassium permanganate in CH2Cl2 by adding Na2CO3 to adjust pH to 7-8 to obtain tetrabenzoyldibenzylhexaazaisowurtzitane (3) with a yield of 70%. With acetic anhydride (Ac2O) as solvent, monoacetyltribenzoyldibenzylhexaazaisowurtzitane (4), diacetyldibenzoyldibenzylhexaazaisowurtzitane (5), triacetylmonobenzoyldibenzylhexaazaisowurtzitane (6) and tetraacetyldibenzylhexaazaisowurtzitane (7) were also obtained from the oxidation of compound 1. The results show that only the oxidative cleavage of the cage system in compound 1 was observed in most cases. The cleavage was a cation catalysis mechanism. 相似文献
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高超声速飞行使飞行器表面热负荷急剧增加,要求燃料作为推进剂供给飞行器动力的同时满足冷却要求.不同燃料的物理热沉相差无几,利用吸热型碳氢燃料的裂解反应获得热沉势在必行.在这种条件下,单纯的热裂解已不能满足要求,引发及催化裂解作为提高燃料裂解性能的途径成为研究热点.本实验分别以正十二烷、异辛烷和甲基环己烷作为模型化合物,对... 相似文献
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