Abstract

In this work, we develop a new methodology for hypersonic multi-body free-flight experimentation and conduct several tests to explore the aerodynamic separation of equal-sized spherical fragments, which approximates the atmospheric disruption of meteoroids. A novel suspension design enabled by 3D printing is introduced, allowing for rapid, reliable release of clustered spheres into hypersonic flow, and high-speed stereoscopic imagery is employed to visualize the aerodynamically separating spheres. A new data-reduction technique based on synthetic image fitting, along with previous edge-detection and photogrammetric reconstruction methods, is used to track sphere motions; these motions also anchor a novel self-calibration procedure for the camera apparatus. To probe the separation characteristics of disrupted meteoroids with increasing fragment population, clusters of 4, 11, and 36 equal-sized spheres are subjected to Mach 6 flow. Strong dependence of trajectories on subcluster interactions is discerned for both 4 and 11 spheres, with two-body lifting pairs identified as critical arrangements capable of producing outlying fragments, whereas the initial stage of mutual repulsion is observed to exert greater influence as the cluster population is increased. Finally, terminal lateral velocity measurements are compared with other studies to synthesize a coherent picture of separation trends for equal-sized bodies.

Graphic abstract

中文翻译：

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高超音速流中的球团簇分离实验

摘要

在这项工作中，我们开发了一种用于高超声速多体自由飞行实验的新方法，并进行了一些测试以探索等大小球形碎片的空气动力学分离，这近似于流星体在大气中的破坏。引入了一种通过3D打印实现的新型悬架设计，可以将团簇球体快速，可靠地释放到高超音速流中，并使用高速立体图像来可视化空气动力学分离的球体。一种基于合成图像拟合的新的数据缩减技术，再加上先前的边缘检测和摄影测量重建方法，可用于跟踪球体运动。这些动作还为相机设备提供了一种新颖的自校准程序。为了探测随着碎片数量增加而破坏的流星体的分离特性，对4、11和36个等大小的球团进行6马赫流处理。在4个球体和11个球体上都可以看出轨迹对子团簇相互作用的强烈依赖性，其中两体举升对被确定为能够产生离群碎片的关键布置，而随着团簇人口的增加，相互排斥的初始阶段会产生更大的影响。增加。最后，将终端横向速度测量结果与其他研究进行比较，以合成大小相同的物体分离趋势的连贯图像。两体举升对被认为是能够产生离体碎片的关键布置，而随着团簇数量的增加，相互排斥的初始阶段会产生更大的影响。最后，将终端横向速度测量结果与其他研究结果进行比较，以合成大小相同的物体分离趋势的连贯图像。两体举升对被认为是能够产生离体碎片的关键布置，而随着团簇数量的增加，相互排斥的初始阶段会产生更大的影响。最后，将终端横向速度测量结果与其他研究结果进行比较，以合成大小相同的物体分离趋势的连贯图像。

图形摘要