Authors:

Matthew S Leight

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About Paper:

Within the field of hypersonics, predicting the interactions of particulates with vehicle surfaces and intakes during atmospheric flight is key in design. However, the shock around supersonic vehicles breaks up these particles, and current research on shock interaction with the micro-scale particles that occupy the upper atmosphere is limited. This research aims to classify the breakup behavior of micrometer-scale ice and water particles through use of Purdue's 3-inch Shock Tube (P3IST). The effects of changing surface tension on droplet breakup were examined initially. Water and isopropyl alcohol mixtures were created, dispensed into the P3IST, and shattered with a shock. Schlieren and Shadowgraph optical systems were used in combination with high-speed cameras to capture the break-up. Shock strength and breakup regime were determined through the video and data from pressure sensors, and variations in breakup patterns were observed. To improve characterization efforts, a Z-Schlieren optical system was assembled and lenses were implemented to zoom in on the test section. These efforts have improved the sensitivity and field of view of the camera, allowing for more descriptive droplet break-up classification. Project results describe regimes of various break- up patterns for atmospheric particles in a shock, which can be used to better predict damage in the supersonic- regime. Methods for optimizing shock tube operations and optical zoom within Schlieren systems were also explored. Further research aims to explore ice particle break up, break-up patterns at higher shock speeds, and examine the lifetime of particles within the shock. Keywords: Shock Tube; Droplet Breakup; Schlieren Videography; Atmospheric Particles

Source:

Purdue University / 2024

Topics:

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Co-authors:

Matthew S Leight