Optical study of a light diaphragm rupture process in an expansion tube
Optical study of a light diaphragm rupture process in an expansion tube
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膨胀管内光阑破裂过程的光学研究
DOI：
10.1007/s001930050003
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发表时间：
2000
期刊：
影响因子：
2.2
通讯作者：
R. Morgan
中科院分区：
文献类型：
--
作者：
M. Wegener;M. Sutcliffe;R. Morgan
摘要。用光学方法研究了玻璃纸薄膜在膨胀管内的破裂。人们早已认识到光膜片对测试流产生的影响，但膜片破裂的机制却鲜为人知。先前的假设是，由于激波的动压力载荷，隔膜在其周围破裂，在某些阶段，隔膜材料被从流动中移除，以允许激波加速到下游的测量速度。在这一系列实验中获得的图像首次显示了膨胀管中隔膜破裂和团块去除的机制。通过冲击波对一个光膜片进行脉冲加载，并在整个破裂过程中以全息方式记录了一系列图像，显示了膜片的逐渐破坏。诸如隔膜材料、气体之间的界面和反射冲击等特征都清晰可见。从图像中导出了破裂动力学的定性和定量方面，并与现有的一维理论进行了比较。
Abstract.Rupture of a light cellophane diaphragm in an expansion tube has been studied by an optical method. The influence of the light diaphragm on test flow generation has long been recognised, however the diaphragm rupture mechanism is less well known. It has been previously postulated that the diaphragm ruptures around its periphery due to the dynamic pressure loading of the shock wave, with the diaphragm material at some stage being removed from the flow to allow the shock to accelerate to the measured speeds downstream. The images obtained in this series of experiments are the first to show the mechanism of diaphragm rupture and mass removal in an expansion tube. A light diaphragm was impulsively loaded via a shock wave and a series of images was recorded holographically throughout the rupture process, showing gradual destruction of the diaphragm. Features such as the diaphragm material, the interface between gases, and a reflected shock were clearly visualised. Both qualitative and quantitative aspects of the rupture dynamics were derived from the images and compared with existing one-dimensional theory.