共查询到20条相似文献,搜索用时 66 毫秒
1.
针对爆轰波对碰驱动下金属圆管对碰区易出现过早断裂的问题,以加环紫铜(T2)圆管作为研究对象,利用高速分幅摄影、脉冲X光照相、VISAR三种测试技术,对其在爆轰波对碰驱动下的变形及破坏过程进行了观测。实验结果显示:在紫铜圆管对碰部位增加保护环结构,可以有效推迟该部位圆管的破裂时间。但同时也发现:加保护环后圆管对碰区会出现射流状超前突起现象。由高速摄影结果与X光照相结果对比分析证实:射流状超前突起物质为圆管表面微喷颗粒与空气冲击波混合形成的雾状结构。另外,采用DYNA3D程序对实验模型进行了模拟,计算结果与实验结果符合较好。最后,利用DYNA3D程序就保护环倒角变化对金属圆管对碰区壳体破裂的影响特征进行了初步分析。 相似文献
2.
3.
4.
5.
6.
7.
8.
9.
点引爆圆板装药驱动飞板的实验及二维数值模拟 总被引:1,自引:0,他引:1
本文报导点引爆圆板装药驱动飞板的实验及二维数值模拟研究结果。实验测定了有机玻璃、铝、钢和铜四种飞板在爆轰产物驱动下的碰靶时间及碰靶波形,并将二维数值模拟结果与测量结果进行了比较,二者符合较好。文中还就数值模拟中存在的一些问题进行了简要分析、讨论。 相似文献
10.
采用频散可控的耗散格式(DCD),求解Euler方程和一种改进的二阶段化学反应模型,
对氢氧反向-正向双爆轰驱动段激波管进行了数值模拟. 计算结果表明:当辅驱动段与主驱动
段初始压力比小于临界值时,Taylor波仍会出现,但波扇夹角较单一前向爆轰驱动段小,入
射激波马赫数衰减率变小;当初始压力比等于临界值时,主驱动段中的Taylor波完全被消除,
入射激波马赫数不再衰减. 当初始压力比大于临界值时,在主驱动段中能产生过驱动爆轰波,
不仅Taylor波被完全消除,而且驱动能力较单一前向爆轰驱动段强. 相似文献
11.
爆轰法合成纳米氧化铝的实验研究 总被引:5,自引:0,他引:5
以硝酸铝为原料,混入泰安粉维持稳定爆轰,进行了爆轰合成纳米氧化铝的实验研究。经过对实验样品进行高分辨率透射电镜、X射线衍射、热分析和比表面积测定,证实爆轰中产生的氧化铝为纳米尺度球型粉末,其粒度主要分布在10~50 nm之间,平均粒度约为25 nm,晶型为中温的-Al2O3。从对实验结果的讨论说明,该纳米氧化铝是在爆轰反应区内以离子或分子态直接凝聚而成的,由于凝聚与生长过程在微秒量级内完成,故其颗粒生长没有择优取向,呈完整的球型。 相似文献
12.
Experimental study on spherically imploding detonation waves 总被引:1,自引:0,他引:1
Spherically imploding detonation waves propagating in a stoichiometric propane-oxygen mixture in a convergent hemispherical space having an innerdiameter of 800 mm were experimentally investigated with an intention to clarify the reason for the anomalous increase of the pressure and temperature behind the imploding detonation waves observed in a smaller vessel having an inner-diameter of 360 mm. The relations between the radial distance of the detonation front, the peak pressure, spectroscopic temperature at the imploding detonation front and those behind the shock waves reflected from the implosion focus show almost the same tendencies as in the smaller convergent space. The pressure as well as the temperature at the imploding detonation front increases, with the propagation of the implosion, more rapidly than theoretically estimated. The reason for it is attributed to the double imploding detonation waves.This article was processed using Springer-Verlag TEX Shock Waves macro package 1990. 相似文献
13.
气相爆轰波绕射流场显示研究 总被引:1,自引:1,他引:1
采用基于红宝石激光器(波长694.3 nm)的纹影系统,对气相爆轰波绕射进行了初步的流场显示研究。采用单色激光和合适半带宽(15 nm)的滤光片,有效地消除了爆轰波自发光对流场显示的影响。合理设置激光器同步控制系统的触发延时,得到了序列的爆轰波阵面纹影照片。结果表明:图像清晰地显示了爆轰波阵面的诱导激波、横波及化学反应区。当爆轰波在左尖点处绕射,受稀疏波作用,诱导激波与化学反应区明显分离,导致爆轰波衰减为爆燃。分离的诱导激波和折皱的化学反应区在纹影图上清晰可见。诱导激波在垂直支管右壁面反射,诱导二次起爆。畸变爆轰波在水平和垂直支管中均发生马赫反射。提高初压,爆轰波受分叉口几何属性的影响减小,畸变爆轰波在水平和垂直支管下游较易恢复为自持爆轰波。 相似文献
14.
The detonation chamber developed by K. Terao and H. G. Wagner in Göttingen has been improved, in order to concentrate the combustion energy more effectively to a focus, so that imploding detonation waves are initiated by two-step divergent detonation waves in a hemispherical space having an effective diameter of 500 mm. The imploding detonation waves are investigated by measuring their propagation velocity using ion probes and pressure variations at different positions in the space by a piezoelectric pressure transducer, while the temperature in the implosion center is measured by a laser light scattering method. The results suggest that the peak pressure at the detonation front increases with the propagation to the center more rapidly than that in the Göttingen apparatus, while the propagation velocity is almost the same. A temperature from 107 K to 108 K is also observed in the focus of the imploding detonation waves.This article was processed using Springer-Verlag TEX Shock Waves macro package 1.0 and the AMS fonts, developed by the American Mathematical Society. 相似文献
15.
16.
17.
对2岩石炸药的定常爆轰形成过程进行了实验研究;对起爆端稀疏波效应进行了计算。实验结果表明,距起爆端约10倍装药厚度以内为不定常爆轰区。距离起爆端小于5倍装药厚度时,飞板速度及碰撞角增幅较大,5~10倍装药厚度,两者增幅趋缓,10倍装药厚度以后,爆速、飞板速度及碰撞角逐步进入定常状态。飞板碰撞角的工程计算与实验结果的一致性较好。 相似文献
18.
Behavior of detonation waves at low pressures 总被引:1,自引:0,他引:1
With respect to stability of gaseous detonations, unsteady behavior of galloping detonations and re-initiation process of
hydrogen-oxygen mixtures are studied using a detonation tube of 14 m in length and 45 mm i.d. The arrival of the shock wave
and the reaction front is detected individually by a double probe combining of a pressure and an ion probe. The experimental
results show that there are two different types of the re-initiation mechanism. One is essentially the same as that of deflagration
to detonation transition in the sense that a shock wave generated by flame acceleration causes a local explosion. From calculated
values of ignition delay behind the shock wave decoupled from the reaction front, the other is found to be closely related
with spontaneous ignition. In this case, the fundamental propagation mode shows a spinning detonation.
Received 10 March 1997 / Accepted 8 June 1997 相似文献
19.