Synchro-ballistic recording of detonation phenomena
Synchro-ballistic recording of detonation phenomena
复制标题
爆炸现象的同步弹道记录
DOI：
10.1117/12.294504
复制
发表时间：
1997
影响因子：
4.1
通讯作者：
D. Idar
中科院分区：
文献类型：
--
作者：
R. Critchfield;B. Asay;J. Bdzil;W. Davis;E. Ferm;D. Idar
同步弹道使用旋转镜条纹相机可以详细记录已知速度和方向的高速事件。在介绍同步弹道技术之后，本文详细介绍了同步弹道技术在高爆研究领域的两种不同应用。在第一个系列的实验中，爆炸前的形状被记录为到达的爆炸冲击波使一个倾斜安装的反射镜倾斜，导致反射光从成像透镜偏转。这些试验是为了校准和证实Bdzil和Stewart的渐近爆轰动力学（DSD）理论。事件的相速度在每微秒10到30毫米之间。光学放大率设置为最佳利用胶片的空间尺寸和相位速度调整，以提供同步在相机的最大写入速度。该技术的初始校准是使用圆柱形HE几何形状在装药直径范围内进行的，并且具有足够的长径比以确保稳定的爆震波。最后的实验利用弧形炸药装药，产生不对称爆震前记录。第二个系列的实验包括拍摄速度范围为每微秒2到9毫米的聚能射流。为了适应不同的速度范围，有必要进行多次测试，每次测试都与喷气机的不同部分同步。实验装置包括一个真空室，以防止大气烧蚀的射流尖端与冲击氩背照明，以产生一个阴影图形图像。
Synchro-ballistic use of rotating-mirror streak cameras allows for detailed recording of high-speed events of known velocity and direction. After an introduction to the synchro-ballistic technique, this paper details two diverse applications of the technique as applied in the field of high-explosives research. In the first series of experiments detonation-front shape is recorded as the arriving detonation shock wave tilts an obliquely mounted mirror, causing reflected light to be deflected from the imaging lens. These tests were conducted for the purpose of calibrating and confirming the asymptotic detonation shock dynamics (DSD) theory of Bdzil and Stewart. The phase velocities of the events range from ten to thirty millimeters per microsecond. Optical magnification is set for optimal use of the film's spatial dimension and the phase velocity is adjusted to provide synchronization at the camera's maximum writing speed. Initial calibration of the technique is undertaken using a cylindrical HE geometry over a range of charge diameters and of sufficient length-to- diameter ratio to insure a stable detonation wave. The final experiment utilizes an arc-shaped explosive charge, resulting in an asymmetric denotation-front record. The second series of experiments consists of photographing a shaped-charge jet having a velocity range of two to nine millimeters per microsecond. To accommodate the range of velocities it is necessary to fire several tests, each synchronized to a different section of the jet. The experimental apparatus consists of a vacuum chamber to preclude atmospheric ablation of the jet tip with shocked-argon back lighting to produce a shadow-graph image.