内窥式粒子成像测速系统(Endo-PIV)粒子测速仪LaVision 高速抛射体穿透沙层的实验研究

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The dynamics associated with a long rod projectile, travelling at high velocity, penetrating a
heterogeneous target has long been an active research area. Historically both analytic and
numeric models have assumed a continuous target medium in order to predict the performance of the penetrator-target system, even in cases where the target is composed of concrete, foam or a granular porous medium such as sand. Continuum models fail to capture the complicated grain level response within the heterogeneous target which can result in asymmetric loading of the projectile leading to variations in projectile performance. In this work a series of experiments were conducted in order to investigate the penetration dynamics of loose sand, specifically with a goal of building a better understanding of the grain level dynamics. High speed photography coupled with a particle image velocimetry (PIV) technique were used to capture both the grain level and bulk response of the penetration event. Experiments were conducted over a velocity range of 30 to 100 m/s using both cylindrical and spherical projectiles. The results indicate that variations in the projectile size and shape effect cavity formation and that cavity formation occurs nearly 25 times slower than the projectile velocity.

 仪器简介：
        在内燃机引擎，透平机械或泵体中进行PIV测量通常需要设计加工昂贵带有光学透明窗口或全光学玻璃模型。采用相机内窥镜或激光内窥镜可以在只开尺寸很小的通光孔径。先进的DaVis软件平台，集成了对较大光学成像畸变进行自动校正计算功能。LaVision提供的专门用于包括PIV测量应用的相机和激光内窥镜，通光波段涵盖可见光和紫外光波段。紫外光波段可以应用于燃烧和流动现象中的激光诱导荧光测量系统中。内窥式测量大大降低了对被测对象的机械改动和加工的工作量和时间以及投资成本。      

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