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Investigation of Baffled Shock Tubes for Low Velocity Ram Accelerator Start.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Investigation of Baffled Shock Tubes for Low Velocity Ram Accelerator Start./
Author:	Bernhard, Desiree.
Description:	1 online resource (92 pages)
Notes:	Source: Masters Abstracts International, Volume: 85-01.
Contained By:	Masters Abstracts International85-01.
Subject:	Engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9798379909239

Investigation of Baffled Shock Tubes for Low Velocity Ram Accelerator Start.
Bernhard, Desiree.

Investigation of Baffled Shock Tubes for Low Velocity Ram Accelerator Start. - 1 online resource (92 pages)

Source: Masters Abstracts International, Volume: 85-01.

Thesis (M.S.)--University of Washington, 2023.

Includes bibliographical references

The ram accelerator is a hypervelocity launcher in which a projectile is injected into stationary tubes filled with premixed fuel and oxidizer. Combustion is initiated as the projectile passes, creating a high pressure base that travels with it to produce thrust. To start the ram accelerator process, the projectile must be injected into the mixture at a minimum Mach number. Preliminary investigations from previous work indicate successful ram acceleration can be achieved by accelerating the propellant towards the projectile, ultimately reducing the projectile's entrance velocity while keeping the same in-tube Mach number. Accelerating propellant towards an oncoming projectile for a baffled tube ram accelerator configuration was investigated. Experimental shock wave propagation data were collected from a baffled shock tube and a computational fluid dynamics simulation was constructed in ANSYS Fluent. Experimental data provided estimates for pressure ratios, diaphragm burst times, and diaphragm scoring configurations for a low velocity start configuration. Both experimental and numerical results showed strong shock wave attenuation throughout the baffles, with a 75% strength reduction in 13 diameters compared to a smooth bore case. The contact surface velocities from the simulation provided a wave arrival time in the driven section used to time with a projectile bursting the entrance diaphragm. The results of this investigation designed an experiment to establish initial proof of concept for low velocity start in methane-oxygen with carbon dioxide and methane-air-oxygen mixtures.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798379909239Subjects--Topical Terms:

561152
Engineering.
Subjects--Index Terms:

AcceleratorIndex Terms--Genre/Form:

554714
Electronic books.

Investigation of Baffled Shock Tubes for Low Velocity Ram Accelerator Start.
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245 1 0 $a Investigation of Baffled Shock Tubes for Low Velocity Ram Accelerator Start.
264 0 $c 2023
300 $a 1 online resource (92 pages)
336 $a text $b txt $2 rdacontent
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500 $a Source: Masters Abstracts International, Volume: 85-01.
500 $a Advisor: Knowlen, Carl.
502 $a Thesis (M.S.)--University of Washington, 2023.
504 $a Includes bibliographical references
520 $a The ram accelerator is a hypervelocity launcher in which a projectile is injected into stationary tubes filled with premixed fuel and oxidizer. Combustion is initiated as the projectile passes, creating a high pressure base that travels with it to produce thrust. To start the ram accelerator process, the projectile must be injected into the mixture at a minimum Mach number. Preliminary investigations from previous work indicate successful ram acceleration can be achieved by accelerating the propellant towards the projectile, ultimately reducing the projectile's entrance velocity while keeping the same in-tube Mach number. Accelerating propellant towards an oncoming projectile for a baffled tube ram accelerator configuration was investigated. Experimental shock wave propagation data were collected from a baffled shock tube and a computational fluid dynamics simulation was constructed in ANSYS Fluent. Experimental data provided estimates for pressure ratios, diaphragm burst times, and diaphragm scoring configurations for a low velocity start configuration. Both experimental and numerical results showed strong shock wave attenuation throughout the baffles, with a 75% strength reduction in 13 diameters compared to a smooth bore case. The contact surface velocities from the simulation provided a wave arrival time in the driven section used to time with a projectile bursting the entrance diaphragm. The results of this investigation designed an experiment to establish initial proof of concept for low velocity start in methane-oxygen with carbon dioxide and methane-air-oxygen mixtures.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Engineering. $3 561152
650 4 $a Aerospace engineering. $3 686400
650 4 $a Mechanical engineering. $3 557493
653 $a Accelerator
653 $a Baffle
653 $a Propulsion
653 $a Ram
653 $a Shock
653 $a Velocity
655 7 $a Electronic books. $2 local $3 554714
690 $a 0537
690 $a 0538
690 $a 0548
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Washington. $b Aeronautics and Astronautics. $3 1178958
773 0 $t Masters Abstracts International $g 85-01.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30527363 $z click for full text (PQDT)