共查询到17条相似文献,搜索用时 156 毫秒
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猛炸药爆轰产物的状态可以用两相的强排斥-平动物态方程(简称为两相的排平物态方程)很好地描述。以爆轰产物分两段的等熵曲线为参考曲线的两相的排平(k, γ)物态方程,已经用于爆轰参数和强爆轰参数的理论估算,所得理论值与实验值符合得很好。为了更方便地估算爆温,有必要给出描述分子间相互作用的比内能项与压力项(分别简称为冷比内能与冷压)。参照描述分子间相互作用的Morse势和Mie势的排斥项,给出了带待定参数A、m、n和l的冷比能项和冷压项,这样的物态方程被称为两相的排平(A, m, n, l)物态方程。用TNT的{D, ρ0}实验数据组,确定了两相的排平(A, m, n, l)物态方程的参数n=1和l=1/3,因此,可将其简称为两相的排平(A, m)物态方程。它适用于所有的猛炸药的爆轰产物。用硝基甲烷的强爆轰参数{p, D, T}实验数据组对其所做的检验表明,两相的排平(A, m)物态方程是恰当的爆轰产物物态方程。 相似文献
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爆轰产物中或多或少含有固态碳 ,一相的排平物态方程被推广为两相的之后 ,以某种炸药的一条已知等熵线为参考曲线 ,就可以用来估算其各种初始装药密度下的爆轰参数 .用产物中含碳量较多的TNT的 {D ,ρ0 }实验数据与理论估算值相比较 ,可以对爆轰的ZND理论的假设进行检验 .检验的结果再一次表明 ,爆轰的ZND理论的假设是成立的 ,并且排平物态方程是恰当的爆轰产物的物态方程 . 相似文献
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介绍并分析了Campbell等人研究均匀炸药冲击起爆和起爆后行为所获得的实验结果,但不涉及其冲击起爆条件。Campbell等人的实验表明,足够强的冲击波进入硝基甲烷后,经过若干微秒的感应时间,爆轰发生在隔板与炸药间的界面处。这就是说,在均匀炸药中,足够强的冲击虽非瞬时但直接(指不经过其它过程,如爆燃)引发了爆轰。重新处理后的实验数据表明:硝基甲烷起爆后,爆轰波的净爆速小于正常爆速;当进入硝基甲烷的初始冲击波的有效压力peff由8.82 GPa升至12.14 GPa时,感应时间tind的实验值由3.06 μs降至0.705 μs。以两相的排平(A,m)物态方程描述爆轰产物,较为严格地重新推导了基于热起爆理论的估算感应时间tind的公式。在上述peff的变化范围内,tind的理论值则由248 μs降至0.99 μs,明显地高于实验值。这表明,热起爆理论不适于描述硝基甲烷的冲击起爆行为。从本质上讲,热起爆理论对均匀炸药的冲击起爆行为的描述,不符合物质运动的微观图像,因此,它不适于描述均匀炸药的上述行为。 相似文献
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爆轰的ZND理论,作为一个理论是需要经过严格检验之后才能承认其成立的。美国科学家做了这样的检验,但由于缺乏对爆轰产物物态方程的了解,没有能得出肯定的检验结论。用分子间有强排斥作用与分子作完全自由平动的液态物态方程(R-T物态方程)所做的检验表明爆轰的ZND理论是成立的。 相似文献
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用Jones公式检验爆轰的ZND理论是另一种检验方法.这种检验方法不需要知道爆轰产物物态方程的形式,只需知道其存在即可.百密一疏,美国科学家用这种方法检验得出的结论是ZND理论不成立.更稹密地运用这种方法得出的检验结论是爆轰的ZND理论成立. 相似文献
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为快速预估任意配比的多元混合炸药爆轰产物的JWL(Jones-Wilkins-Lee)参数,提出了快速确定多元混合炸药爆轰驱动圆筒膨胀规律的理论方法,即在给定各组分爆轰产物JWL参数的前提下,根据能量守恒定律,采用Gurney模型,确定圆筒试验中多元混合炸药爆轰驱动圆筒膨胀距离随时间变化的曲线。同时,利用能量守恒原理以及经典爆轰理论中通过常γ状态方程得到的爆速、爆压和爆热之间的关系式,提出了确定多元混合炸药爆速和爆压的方法。采用该理论方法,分别计算了多元混合炸药PBXC03和PBXC10爆轰驱动圆筒膨胀规律及爆速和爆压,计算结果与前人的实验结果符合较好,验证了该理论方法的可行性和有效性。 相似文献
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用Jones公式检验爆轰的ZND理论是另一种检验方法。这种检验方法不需要知道爆轰产物物态方程的形式,只需知道其存在即可,百密一疏,美国科学家用这种方法检验得出的结论是ZND理论不成立。更稹密地运用这种方法得出的检验结论是爆轰的ZND理论成立。 相似文献
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Yong Gan Zhen Chen K. Gangopadhyay A. Bezmelnitsyn S. Gangopadhyay 《Journal of nanoparticle research》2010,12(3):719-726
An equation of state (EOS) for the detonation product of the copper oxide/aluminum (CuO/Al) nanothermite composites is developed
based on the Chapman–Jouguet (CJ) theory and the nanothermite detonation experiment. The EOS is implemented into a coupled
computational fluid dynamics and computational solid dynamics code through the material point method for the model-based simulations
of the detonation response of the CuO/Al nanothermite material placed in a small well. The simulations demonstrate the validity
of the formulated EOS to catch the essential feature of the detonation response of the CuO/Al nanothermite. The EOS parameters
are determined by comparing simulated and experimentally measured pressure–time histories. 相似文献
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The generation of constitutive detonation performance model components for high explosives (HEs) invariably involves reference to experiment, as reliable first-principles determinations of these models are beyond our current capability. Whatever its form or complexity, the detonation performance model must be able to accurately capture the detonation wave timing and the energy release that it triggers upon arrival. Specifically, the HE products equation-of-state (EOS), which largely determines the detonating HE’s ability to do useful work on its surroundings, is typically inferred from cylinder expansion tests where metal-confined HE cylinders are detonated and the ensuing outer confiner wall-expansion trajectory is recorded. Expensive, iterative comparisons to multimaterial hydrodynamic (or “hydrocode”) simulations of these experiments are then used to constrain the parameters of the chosen EOS form. Here, we report on new detonation performance experiments produced for the highly-ideal, plastic-bonded explosive and CL-20-based LX-19 which are used to produce a new sub-scale detonation performance model for the explosive. This includes new products EOS and a new Detonation Shock Dynamics front propagation law. We also confirm the capability of two new, non-hydrocode-based products EOS generation techniques to accelerate the HE model parameterization process. This latter development is particularly significant for detonation performance modeling of new HE formulations. 相似文献
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爆轰产物物态方程及CHBr3相变的理论研究 总被引:4,自引:0,他引:4
由吉布斯自由能最小计算处于化学平衡状态的气体和固体混合系统的平衡组分。以BKW和VLW作为爆轰产物的物态方程对几种炸药爆轰参数作了预言,计算结果与实验值吻合得非常好。另外,还对CHBr3的冲击压缩分解作了化学平衡计算,给出了冲击压缩曲线,对文献[6]中提出的CHBr3在55~60 GPa存在相变的看法提出了质疑。 相似文献
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P. V. Komissarov G. N. Sokolov B. S. Ermolaev A. A. Borisov 《Russian Journal of Physical Chemistry B, Focus on Physics》2011,5(3):502-512
The initiation and propagation of low-velocity detonation in ammonium perchlorate (AP)-aluminum-nitromethane (NM) mixtures
with Al: AP ratios of 1: 1 to 2.5: 1 and porosities from 40 (10 wt % HM) to 0% (40 wt % NM) in strong steel shells (in the
air) and plastic shells submerged in water are experimentally studied. The optimum contents of the components that provide
reliable initiation of steady detonation (at velocities from 2 to 5 km/s) by weak explosive sources in mixtures with an Al:
AP ratio of 1: 1 and above are determined. The selected mixtures reproducibly detonate in plastic shells surrounded by a 30-cm-thick
layer of water at velocities somewhat lower than in strong steel shells in the air. 相似文献
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依据C-J(Chapman-Jouguet)理论,对爆轰问题中的气态爆轰产物和未反应炸药分别考虑不同的参考状态,并根据参考状态选用特定的Mie-Grüneisen状态方程。忽略化学反应过程,爆轰产物厚度为零的前导激波面以界面的形式存在。数值模拟中,爆轰波的演化分为波面传播以及与未反应介质相互作用两个部分。传播过程中,爆轰波的传播速度即恒定的爆速,爆轰产物在传播过程中瞬间形成,而相互作用过程则是通过Mie-Grüneisen多介质混合模型来计算爆轰波的持续冲击作用。借助于Mie-Grüneisen状态方程以及Mie-Grüneisen多介质混合模型,可以很好地模拟爆轰波的运动过程。对比理论参数及文献的计算结果发现,模拟结果具备较好的准确度。 相似文献
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A. V. Utkin V. M. Mochalova S. I. Torunov 《Russian Journal of Physical Chemistry B, Focus on Physics》2011,5(3):513-518
An experimental study of the detonation parameters and structure of the reaction zone for liquid high explosives (HEs), such
as bis(2-fluoro-2,2-dinitroethyl)formal (FEFO), tetranitromethane (TNM), and nitromethane (NM) is performed. For each of these
HEs, the time corresponding to the position of the Chapman-Jouguet point is determined: for FEFO, from experiments conducted
at different charge diameters (≈300 ns); for TNM, at a fixed diameter but at different lengths (≈200 ns); and for NM, at the
same diameter and length of the shell, but with detonation being initiated by different HE charge (≈50 ns). The particle velocity
and pressure at the Chapman-Jouguet point for these explosives were measured. For TNM and NM, the dependence of the detonation
velocity on the charge diameter was obtained 相似文献