共查询到17条相似文献,搜索用时 62 毫秒
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B炸药爆轰波拐角传播的三维数值模拟 总被引:1,自引:1,他引:1
为研究B炸药起爆后爆轰波在拐角中的传播特性以及拐角爆轰低压流场现象,运用LS-DYNA3D程序对120°,90°,45°三种特定的拐角装药的爆轰波传播现象进行了数值模拟,观察了爆轰波通过拐角的传播过程,讨论了爆轰波波阵面通过拐角后爆速的变化情况.结果表明,爆轰波通过拐角后由于传播面积的变化而产生衰减-增长过程,装药拐角越大,爆轰波通过时越稳定;随着装药拐角的减小,拐角处的波阵面压力、爆速和传播能力都逐渐降低. 相似文献
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提出并设计了一种应用于喷雾冷却塔的新型旋流引射喷嘴,利用Fluent软件对喷嘴内部流场进行两相流数值模拟,并实验测量了不同压力下的进水流量和引射空气流量,实验数据与模拟结果具有较高的吻合度,最大相对误差低于10%,验证了数值模拟的准确性。随后利用该方法得到了不同结构参数下喷嘴内部流场的仿真值,重点研究了旋流片螺旋升角、混合管直径和长度以及扩散管长度对喷嘴空气引射性能与流动特性的影响规律,从而对喷嘴结构进行优化。模拟结果表明:为使喷嘴取得最佳的引射性能,同时保证较大的出口速度,旋流片螺旋升角的最优取值范围为35°—45°,混合管直径为2.5—3倍喉嘴直径d,混合管长度为(4.5—7)d,扩散管长度为(1.5—4.5)d。 相似文献
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Experimental Investigation and Numerical Simulation of an Expanding Multifront Detonation Wave 总被引:1,自引:0,他引:1
Results of experimental investigations of an expanding multifront detonation wave are presented. Two stages of spontaneous formation of new disturbances and transverse waves on the expanding detonationwave front are observed. The main mechanisms of reinitiation of detonation waves are discussed. Twodimensional numerical simulation of the dynamics of a multifront detonation wave in a linearly expanding channel is performed. The effect of spontaneous formation of new disturbances and new transverse waves is confirmed by computations, and the main mechanism of multiplication of transverse waves is the instability of detonationwavefront elements at the stage they cease to be in the overdriven state and are attenuated during expansion. 相似文献
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Based on the mathematical model of a reacting two-phase medium in the two-velocity, two-temperature approximation, the process of planar shock wave entering a cloud of aluminum particles is numerically studied. The incident shock wave may have either a rectangular or a triangular profile, i.e., it may be accompanied by a rarefaction wave. An analysis of numerical data allowed us to determine conditions of possible establishment of a steady detonation regime in the cloud. Scenarios of initiation and types of detonation flows in the cloud are determined as functions of the amplitude of the incident shock wave and initiation energy. Criteria of detonation initiation for various fractions of particles are obtained, which express the dependence of the energy stored in the shock wave on its Mach number. 相似文献
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A. R. Gushanov 《Combustion, Explosion, and Shock Waves》2001,37(1):113-118
The transition of a system of partial differential equations which describe the stationary flow behind the shock–wave front of a detonation complex upon detonation of a cylindrical charge to a system of ordinary differential equations is performed by means of the series expansion in terms of the radial variable. The necessary equations for determination of the derivatives of solutions with respect to the parameters and the initial conditions for them are formulated. Imposing the condition of continuous extendibility of the solutions leads to equations that allow one to determine the shape of a shock–wave front as a function of wave velocity. 相似文献
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RicardoA.L. Mendes JosL.S. deA.Campos IgorY. Plaksin JoseM.B.M. Ribeiro 《Propellants, Explosives, Pyrotechnics》2004,29(3):146-149
In order to characterize the initial phase of the divergent detonation wave in PBX, a hemispheric explosive sample was initiated by a long cylindrical charge of the same explosive. The tested PBX is composed of 85 wt% of RDX and 15 wt% of binder based on HTPB. This PBX‐RDX presents an effective density of 1.57 g/cm3, and a detonation velocity of 7.90 mm/μs. 相似文献
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随着水驱开发油田开发进入高含水期,油田后期开采难度加大,为实现油田的保产稳产需要进行油田的剩余油分布研究从而实现油田进一步的挖潜。采用流管法以实现油田剩余油分布数值模拟研究。建立了一注一采以及反九点法井网概念模型,结合B-L方程求解,绘制了相应概念模型的渗流模板,说明了运用渗流模板进行水驱开发油藏开发效果评价方法。分别分析了一注一采以及反九点法面积井网概念模型饱和度场,与床用数值模拟软件结果进行对比,进一步验证说明流管法进行油田数值模拟研究的可行性。选取某实际区块进行流管法数值模拟研究并且与传统数值模拟方法进行对比分析,说明流管法在进行油田开发剩余油分布分析方面的适用性。 相似文献