Geometric Effect on Impulse in a Gas Redirected Shock Tube
Abstract
The behavior of an expanding gas from a shock tube when redirected by external geometry can vary with changes implemented to the external geometry. Large force oscillations initially occurred, as modifications were made to the geometry the force-vs-time curve dampened. Changing the geometry impacts how the expanding flow reacts to the change in direction. The analysis conducted five numerical studies on different geometries at two different stability values. Force vs time curves were created and the impulse was computed from the force curves. The different geometries were compared to one another for impulse and force dampening. Results show that modifying the internal geometry does impact the impulse. Results also show that the explicit scheme was stable and that using a larger courant number improved computing resources while not affecting error in impulse values. By conducting numerical studies of how the impulse is impacted by geometry, a more stable, effective, efficient model was developed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 26, 2018
- Accession Number
- AD1063412
Entities
People
- David Marshall
Organizations
- United States Army Armament Research, Development and Engineering Center