Arc-Driven Shock Tube

Summer, '11 My Work at CePaST

Jason BuchananOctober 10, 2012

What is a Shock Tube?

Instrument used to replicate and direct blast Instrument used to replicate and direct blast waves.waves.

Arc-Driven ST v. Compression STArc-Driven ST v. Compression ST

History and Uses of Shock Tubes 1899 Pierre Vieille 1940's Compression Shock Tube 1966 Blast/Electric Shock Tube

Scientific, biomedical & military applications Analyzing flow characteristics, blast resistances,

wave fronts, plasma, aerodynamic theory Can be used like a wind tunnel

Shape of the plasma

Characteristics

ADST High-capacitance

electric driver Speeds up to Mach

130 Turbulent flow

CST Pressure driver with

diaphragm Speeds up to Mach

30 Laminar flow

So how do we get there?

Vacuum systems Mean free path Turbomolecular +

Roughing Pumps Ion gauge Baking

Why? No contamination Need airtight system

What holds us back?

Virtual leaks Screws O-rings (rubber, copper) Pipe corners

Actual leaks Loose parts Cracks

Outgassing

My Lab Coworkers Kyron – Professor Brandon – Undergraduate Supervisor Charlemagne – Laser Specialist Jason – Big Bang Lasers Sydney – Glow Discharge Tube Me – Arc-Driven Shock Tube

Sources

Addams, Gomez.” in which our hero accomplishes very small but significant progress in a project Addams, Gomez.” in which our hero accomplishes very small but significant progress in a project designed to create very small but significant pressures.” designed to create very small but significant pressures.” Megajoules & Gigawatts 2010 Megajoules & Gigawatts 2010

Anderson, J.D., Modern Compressible Flow , McGraw Hill Inc., New York, 1984.Anderson, J.D., Modern Compressible Flow , McGraw Hill Inc., New York, 1984.

Baals, Donald. Baals, Donald. Wind Tunnels of NasaWind Tunnels of Nasa. AMES Research Center 2004 . AMES Research Center 2004 http://www.hq.nasa.gov/pao/History/SP-440/ch6-15.htmhttp://www.hq.nasa.gov/pao/History/SP-440/ch6-15.htm

Slater, John W. “Shock Tubes” NPARC Alliance Validation Archive. April 2012. Slater, John W. “Shock Tubes” NPARC Alliance Validation Archive. April 2012. http://www.grc.nasa.gov/WWW/wind/valid/stube/stube.htmlhttp://www.grc.nasa.gov/WWW/wind/valid/stube/stube.html

Varian, Inc History. Paolo Alto, California, 94304. Created 1999Varian, Inc History. Paolo Alto, California, 94304. Created 1999

Wikipeeds, The. <en.wikipedia.org/wiki/[Shock Tube, Ultra High Vacuum Systems]>Wikipeeds, The. <en.wikipedia.org/wiki/[Shock Tube, Ultra High Vacuum Systems]>

Williams, Kyron. Assistant Professor, Department of Physics, FAMU. Center for Plasma Science & Williams, Kyron. Assistant Professor, Department of Physics, FAMU. Center for Plasma Science & TechnologyTechnology

Williams, Sydney. Photographs at CePaST 2011Williams, Sydney. Photographs at CePaST 2011

Wilson, J, Schofield,D, and Regan, J. “Plasma Flow in an Electromagnetic Shock Tube and in a Wilson, J, Schofield,D, and Regan, J. “Plasma Flow in an Electromagnetic Shock Tube and in a Compression Shock Tube.” Current Papers, Ministry of Aviation: Aeronautical Research Council. Compression Shock Tube.” Current Papers, Ministry of Aviation: Aeronautical Research Council. London: Her Majesty's Stationery Office. 1966London: Her Majesty's Stationery Office. 1966