Mechanical Engineering ETDs

Publication Date

Summer 7-28-2021

Abstract

This thesis presents an experimental study of the interaction of a normal shock wave with a sparse curtain of particles. Soda lime particles with a nominal diameter of 40 micrometers are used to form the curtain. A high speed camera captured several segments of the particle curtain flow from the front view, including the early formation stages. The frames from the video segments were then extracted into individual sequential images. Properties were found using the images such as the velocity fields, time evolution of multiphase Atwood number, and perturbation growth. Volume fractions were derived from mass discharge measurements and particle velocities. This experiment presents volume fractions in the range of 2.5\% to 8.4\% along with their distribution. The interaction of between the shock wave and particle interaction will be referred to as particle-shock interaction throughout this narrative. Presented are experimental data for particle-shock interactions occurring at three different Mach numbers: M = 1.2, M = 1.45, and M = 1.7. Experimental pressure data indicates that the shock wave is partially reflected off the curtain, and also transmitted through it. Reflections are more prominent with Mach numbers M = 1.7 and M = 1.45. The lower end of the tested Mach numbers, M = 1.2, reveals reflections are shown to diminish . Flow visualization of the particle-shock interaction is shown at M = 1.2 for several instances after the particle curtain has been impacted by the shock wave. Images corresponding to the flow visualization have been resolved in time to better depicts the time scale the physics is occurring on.

Keywords

Particle-Shock Interaction

Degree Name

Mechanical Engineering

Level of Degree

Masters

Department Name

Mechanical Engineering

First Committee Member (Chair)

Peter Vorobeiff

Second Committee Member

Daniel Banuti

Third Committee Member

Nima Fathi

Document Type

Thesis

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