Abstract
Mitigation of shock waves can be achieved using many different approaches. In this work, an experimental study of passive shock wave mitigation using planar liquid sheets (water or cornstarch suspensions) was completed. The goal was to better understand how planar a liquid sheet could mitigate a planar incident shock wave. The experimental setup consisted of a horizontal shock tube with a square inner cross-sectional area. The shock mitigation effects were studied using high-speed visualization techniques and pressure measurements. Incident shock waves with shock Mach numbers \(M_s = 1.34\) and 1.46 were generated in the shock tube. A square test section frame was designed to hold a rectangular liquid sheet, with a thickness of 5 mm or 10 mm, using plastic membranes and cotton wires to maintain the planar shape and minimize bulge of the liquid sheet. High-speed schlieren and direct high-speed visualization techniques were used to observe the shock wave interaction with the liquid sheets. High-frequency pressure sensors mounted upstream and downstream of the liquid sheet, measured shock wave speed, overpressure, and impulse. Experiments varied by types and thicknesses of liquid sheets and incident shock Mach numbers. Results showed that no transmitted shock wave was observed downstream of the liquid sheets, but compression waves induced by the shock-accelerated liquid coalesced into a shock wave further downstream. A lower peak overpressure and impulse were measured when using thicker liquid sheets, and the cornstarch sheets showed lower peak overpressures and impulses compared to water sheets.
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