共查询到20条相似文献,搜索用时 125 毫秒
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为了研究发射药燃气的实际释放规律,以发射药的燃气生成猛度作为基本参量,对发射药燃气生成猛度在不同条件下的变化规律进行理论分析,并结合密闭爆发器和内弹道数据,绘制和分析不同情况下的Г–ψ曲线,得到在不同装填密度、不同类型的火药和定容、变容条件下,发射药实际燃烧的变化规律。 相似文献
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关于火药能量概念的探讨 总被引:1,自引:0,他引:1
阐明了在火炮条件下,以火药潜能表示火药能量更为实际。火药燃气绝热指数在火药燃烧产物膨胀作功是不容忽视的。新火药设计时应考虑火药的密度潜能问题。 相似文献
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用热力学基本原理分析了火药绝热定容燃烧的过程和状态,提出火药力是状态函数,与作功过程无直接关系。另从气体分子运动论热量按分子运动自由度分配原理分析了火药力、定容爆热的本质和两者间的关系,并进行了数值计算,最后得出火药力的物理含义,供同行参考。 相似文献
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On the basis of describing physicochemical processes in a mixed solid propellant combustion wave, mathematical techniques are suggested for heterogeneous media which make it possible to consider the heterogeneous and gas-phase combustion regimes for individual components in generalized chemical reaction kinetics and to consider their effect on combustion wave velocity. The agglomeration process for Al powder on a hot surface is studied experimentally by high-speed photorecording. A mathematical model is constructed for Al agglomeration in a combustion wave based on agglomeration mechanisms observed in experiments. The dependence of combustion rate on deformation is determined on the basis of an improved method for optical recording of combustion front movement for loaded specimens. The mechanism of the effect of stress on mixed solid propellant combustion rate is connected with activation of chemical bonds of the polymer matrix, which increases its destruction rate. Use of kinetic theory for the durability of polymers made it possible to obtain an analytical equation expressing the dependence of relative combustion rate on measured specimen deformation.Novosibirsk. Translated from Fizika Goreniya i Vzryva, Vol. 29, No. 3, pp. 8–16, May–June, 1993. 相似文献
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A. Vorozhtsov S. Bondarchuk A. Salko O. Kondratova 《Propellants, Explosives, Pyrotechnics》2000,25(5):220-223
A mathematical model is described analyzing the processes during the combustion of a solid propellant gas generator for airbags. Results on parameter variations are presented. For porous and granulate charges the dynamic parameters of the gas flow and the progress of the ignition of the propellant are determined. 相似文献
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A mathematical model of combustion of a composite solid propellant called ALICE (frozen suspension of nanosized aluminum in water) is presented. The model takes into account the combustion of aluminum nanoparticles in water vapor, the motion of combustion products, and the smaller velocity of particles as compared to the gas. The calculated burning rate is consistent with available experimental data on the burning rate of ALICE as a function of pressure. 相似文献
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For combustion of axisymmetric propellant grains under blowing conditions, a mathematical model is proposed and numerical simulation is performed. The effects of incoming–flow parameters (velocity, pressure, and temperature) and surface dimensions and geometry on grain–burning rate are studied. Physical patterns of flow around burning propellant grains are presented. 相似文献
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为研究包覆方式对片状发射药燃烧性能的影响,建立了不同包覆方式下多层片状发射药的物理模型,并推导了形状函数和燃气生成猛度表达式,利用Matlab软件对不同的宽厚比、长厚比及多层结构的片状发射药进行了数值计算;制备了不同长厚比的片状变燃速发射药,并进行了密闭爆发器实验。结果表明,四面包覆和全包覆可以很好地消除临界宽厚比对片状发射药燃烧性能的影响;与两面包覆的片状发射药相比,四面包覆和全包覆的片状发射药能够延缓内层药减面燃烧的时间,其燃气生成猛度的阶跃程度分别提高了1.17%和1.23%,呈现出良好的燃烧渐增性。 相似文献
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The problem of pressure control in a semi-closed volume by changing the critical cross-sectional area of a gas-release channel
is considered upon solid-propellant combustion with the pressure, the combustion rate, and the free volume varied over a wide
range (not smaller than one order of magnitude). For a system of automatic pressure control, a control algorithm is chosen
and the conditions of partial parametric invariance with respect to the variable dynamic properties of the object to be controlled
are formulated. The experimental results obtained upon improvement of the control system for solid rocket propellants whose
exponent in the combustion law is greater than unity are given. The reasons for substantially nonstationary modes of operation
of this system are considered, and a simplified model that approximates the phenomena of nonstationary combustion of a solid
rocket propellant is proposed. The model is identified and the results of mathematical modeling are given. Recommendations
on pressure control in the nonstationary modes of operation are given.
Translated fromFizika Goreniya i Vzryva, Vol. 36, No. 5, pp. 45–56, September–October, 2000. 相似文献
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新型高能叠氮硝胺发射药高压燃烧稳定性研究 总被引:1,自引:0,他引:1
为了研究高能发射药膛内燃烧规律,通过半溶剂法制备了一种火药力高达1240J/g的新型高能叠氮硝胺发射药(ADR),采用高压密闭爆发器和30mm高压模拟试验装置,分别研究了不同温度下ADR发射药定容高压燃烧性能和装填密度、温度以及石墨光泽处理对ADR发射药膛内高压燃烧稳定性的影响。结果表明,不同温度条件下(-40、20和50℃)ADR发射药静态及动态燃烧性能稳定性良好,燃烧过程无异常;随着温度的增加,ADR发射药点火性能提高,增加了膛内燃烧稳定性;装填密度0.48~0.64g/cm3范围内,随着装填密度的增加,ADR发射药膛内压力波强度逐渐增加,但增长幅度减小;对发射药进行石墨光泽处理,增加了ADR发射药起始缓燃效果,使不同温度下膛内压力波强度明显降低;与RGD7发射药相比,ADR发射药火药力较高,爆温较低,发射装药膛内高压燃烧稳定性相当,在高膛压环境中应用前景较好。 相似文献