Characterization of a large caliber explosively driven shock tube

Area of Science:

• Engineering
• Physics
• Materials Science

Background:

• Blast accidents necessitate research into weapon systems, structural integrity, and personnel protection.
• Explosively driven shock tubes offer a viable method for studying high-pressure blast waves and extreme shock environments.

Purpose of the Study:

• To document and characterize a newly constructed large caliber explosively driven shock tube.
• To develop and validate a simulation model for the shock tube's internal flow field.
• To establish a physics-based prediction model for shock wave characteristics.

Main Methods:

• Construction and characterization of a 2.5m inner diameter, 18m length explosively driven shock tube.
• Development and validation of a 2D axisymmetric simulation model.
• Dimensional analysis to create a physics-based prediction model.

Main Results:

• The shock tube can generate a peak pressure of at least 5.49 MPa with 160 kg TNT charges.
• The facility produces higher overpressures than conventional shock tubes, enabling simulation of severe blast loads.
• The study quantitatively characterized shock wave planarity and discussed the influence of charge mass on blast parameters.

Conclusions:

• The developed shock tube significantly expands capabilities for simulating high overpressure blast loads.
• The validated simulation model and prediction model aid in designing future shock experiments and applications.