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An Experimental Study of Unconfined Hydrogen/Oxygen and Hydrogen/Air ExplosionsDevelopment tests are being conducted to characterize unconfined Hydrogen/air and Hydrogen/Oxygen blast characteristics. Most of the existing experiments for these types of explosions address contained explosions, like shock tubes. Therefore, the Hydrogen Unconfined Combustion Test Apparatus (HUCTA) has been developed as a gaseous combustion test device for determining the relationship between overpressure, impulse, and flame speed at various mixture ratios for unconfined reactions of hydrogen/oxygen and hydrogen/air. The system consists of a central platform plumbed to inject and mix component gasses into an attached translucent bag or balloon while monitoring hydrogen concentration. All tests are ignited with a spark with plans to introduce higher energy ignition sources in the future. Surrounding the platform are 9 blast pressure "Pencil" probes. Two high-speed cameras are used to observe flame speed within the combustion zone. The entire system is raised approx. 6 feet off the ground to remove any ground reflection from the measurements. As of this writing greater than 175 tests have been performed and include Design of Experiments test sets. Many of these early tests have used bags or balloons between approx. 340L and approx. 1850L to quantify the effect of gaseous mixture ratio on the properties of interest. All data acquisition is synchronized between the high-speed cameras, the probes, and the ignition system to observe flame and shock propagation. Successful attempts have been made to couple the pressure profile with the progress of the flame front within the combustion zone by placing a probe within the bag. Overpressure and impulse data obtained from these tests are used to anchor engineering analysis tools, CFD models and in the development of blast and fragment acceleration models.
Document ID
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Richardson, Erin
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Skinner, Troy
(Bangham Engineering, Inc. Huntsville, AL, United States)
Blackwood, James
(Bangham Engineering, Inc. Huntsville, AL, United States)
Hays, Michael
(Bangham Engineering, Inc. Huntsville, AL, United States)
Bangham, Mike
(Bangham Engineering, Inc. Huntsville, AL, United States)
Jackson, Austin
(Bangham Engineering, Inc. Huntsville, AL, United States)
Date Acquired
March 9, 2015
Publication Date
December 8, 2014
Subject Category
Propellants And Fuels
Report/Patent Number
Meeting Information
Meeting: Joint Army-Navy-NASA-Air Force (JANNAF) Combustion Conference
Location: Albuquerque, NM
Country: United States
Start Date: December 8, 2014
End Date: December 11, 2014
Sponsors: Department of the Air Force, Department of the Army, NASA Headquarters, Department of the Navy, Department of Defense
Distribution Limits
Public Use Permitted.
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