Dissertation/Thesis Abstract

Construction and characterization of a single stage dual diaphragm gas gun
by Helminiak, Nathaniel Steven, M.S., Marquette University, 2017, 295; 10641398
Abstract (Summary)

In the interest of studying the propagation of shock waves, this work sets out to design, construct, and characterize a pneumatic accelerator that performs high-velocity flyer plate impact tests. A single stage gas gun with a dual diaphragm breach allows for a non-volatile, reliable experimental testing platform for shock phenomena. This remotely operated gas gun utilizes compressed nitrogen to launch projectiles down a 14 foot long, 2 inch diameter bore barrel, which subsequently impacts a target material of interest. A dual diaphragm firing mechanism allows the 4.5 liter breech to reach a total pressure differential of 10ksi before accelerating projectiles to velocities as high as 1,000 m/s (1570-2240 mph). The projectile’s velocity is measured using a series of break pin circuits. The target response can be measured with Photon Doppler Velocimetry (PDV) and/or stress gauge system. A vacuum system eliminates the need for pressure relief in front of the projectile, while additionally allowing the system to remain closed over the entire firing cycle. Characterization of the system will allow for projectile speed to be estimated prior to launching based on initial breach pressure.

Indexing (document details)
Advisor: Borg, John P.
Commitee: Allen, Casey M., Bowman, Anthony J., Fleischmann, Jonathan A., Park, Hyunjae
School: Marquette University
Department: Mechanical Engineering
School Location: United States -- Wisconsin
Source: MAI 57/01M(E), Masters Abstracts International
Source Type: DISSERTATION
Subjects: Thermodynamics, Mechanical engineering, Energy
Keywords: Burst disks, Dual diaphram, Gas gun, Muzzle velocity, Shock physics, Transitional flow
Publication Number: 10641398
ISBN: 9780355482492
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