共查询到20条相似文献,搜索用时 62 毫秒
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对含不同金属添加剂(镁、铝及镁铝合金)、不同硼粉粒度及硼粉含量的含硼富燃料推进剂分别进行了爆热(Qv)、燃烧温度(Tf)和成气率(η)测试,对比研究了金属组分对含硼富燃料推进剂燃烧性能的影响。结果表明:镁比铝能提高含硼富燃料推进剂的爆热值、燃烧温度和成气率;镁铝合金比镁更能降低含硼富燃料推进剂爆热及燃烧温度,且提高推进剂燃烧的成气率;当硼粉粒度较粗或较细时,含硼富燃料推进剂的爆热及燃烧温度均较高,而成气率较低,硼粉粒度适中时,推进剂的爆热值及燃烧温度均较低,而成气率较高;硼粉含量增大(氧化剂AP的含量减小),含硼富燃料推进剂的爆热、成气率均降低,而燃烧温度升高。 相似文献
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硼粒子表面包覆的研究进展 总被引:2,自引:0,他引:2
对硼粒子包覆材料提出了要求,简要介绍了用钛、锆、镁、GAP、AP、LiF等物质包覆硼粉的工艺过程和包覆机理,并阐述了包覆后硼粉对含硼贫氧推进剂工艺及燃烧性能的影响。研究结果表明,包覆是改善制药工艺过程以及提高含硼推进剂燃烧性能的主要途径。 相似文献
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膏体富燃料推进剂冲压发动机挤压输送特性试验研究 总被引:2,自引:0,他引:2
对两种膏体富燃料推进剂(含硼推进剂和铝镁推进剂)进行了挤压输送安全性试验与输送特性试验研究,证明两种膏体富燃料推进剂在1.5~8.0 MPa下挤压输送及喷射是安全可靠的,并进行了膏体富燃料推进剂冲压发动机一次燃烧摸底试验。试验证明,工作安全,喷射、点火、燃烧正常。 相似文献
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含金属推进剂在管道火箭中的燃烧 总被引:1,自引:0,他引:1
研究含金属推进剂的燃烧特性旨在获得用于管道火箭的最佳推进剂。试验测定了含镁-铝合金和硼粒子的推进剂燃速和补燃效率,并计算了与燃料和空气混合比的函数关系。由50%镁-铝合金、20%端羟基聚丁二烯及30%的过氯酸铵组成的推进剂在补燃室中非常有效地燃烧。而由30%硼、40%过氯酸铵及30%端羟基聚丁二烯组成的推进剂燃烧效率却不佳,原因是硼粒子燃烧不完全。在含硼推进剂中加入5%~10%的镁-铝合金可增加燃烧效率。 相似文献
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Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily. 相似文献
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The technique of watermarking has been introduced into 2D vector maps for many potential applications such as protecting the copyright of important GIS (geographical information system) data and tracing the data source of military maps. In most previous works, although the validity of the map data could be preserved during the embedding procedure, the shape-distortions of the map elements are usually neglected which would tend to degrade the invisibility of the watermarking schemes. A shape-preserving algorithm for watermarking 2D vector maps is presented in this paper. A 1D distance sequence extracted from the original map is adopted as the cover data instead of 2D coordinates. A watermark bit is represented by changing the distributions of the cover data. The embedding procedure induces lower shape-distortions than in former works. Experimental results indicate better invisibility of the proposed scheme, as well as its robustness to certain attacks such as map simplification, interpolation, additive noise and most geometric transforms. 相似文献
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Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design. 相似文献
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By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux (kernel version 2.6.11 ) is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development. 相似文献
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By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly. 相似文献
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The initiating behavior of fine-grained explosives by small flyer is studied. The diameter of small flyer in this device is 1 ram. The test results indicate that the granularity of explosives has great effect on its flyer initiating sensitivity.The flyer initiating sensitivity of the fine-grained explosives is higher and the critical initiating energy is lower than that of common explosives. For common explosive, the flyer initiating sensitivity increases as the density is reduced. But for the fine-grained explosive, the test results are exactly opposite. 相似文献
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Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective. 相似文献
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A method to calculate the surface shape error, which is caused by the installing error between the workpiece and the lapping tool in the process of form lapping, is proposed. The mathematical model which the installing translation error influences on the workpiece surface shape error is established. The changing rule of the error is simulated through the calculating example of the paraboloid workpiece. The results indicate that the surface shape error of the workpiece is increasing with the increase of the installing translation error, it is also increasing gradually along the center point of the curve surface to the edge, and the influence is severer to the curve surface with great curvature than that of the small curvature when the translation error is the same. 相似文献
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The paper introduces the performances of magnetostrictive actuators and its applications, discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator, and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material. The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states, and can be used in lowfrequency vibration control system of precise equipment. 相似文献
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The nonlinear dynamic model of spinning ballistic missiles is established during the first boosting phase of the missile. Based on the conventional backstepping sliding mode control and the assumption of a two time-scale separation of missile dynamics, a graded sliding mode controller is designed with two sub-sliding surfaces which have invariability to external disturbances and parameter perturbations, and a matrix which comprises three first order low pass filters is introduced to prevent "explosion of terms". Owing to the upper bounds of the uncertainties are difficult to obtain in advance, adaptive laws are introduced to estimate the values of the uncertainties in real-time. Eventually, the numerical simulation results given to show the proposed controller can ensure the steady flight of missiles. 相似文献