Oxy-acetylene driven laboratory scale shock tubes for studying blast wave effects

Area of Science:

• Engineering
• Physics
• Materials Science

Background:

• Realistic blast wave generation in laboratories is crucial for scientific research.
• Existing shock tube technologies have limitations in blast wave fidelity, accessibility, and cost.

Purpose of the Study:

• To develop and characterize modular, oxy-acetylene driven shock tubes for laboratory blast wave simulation.
• To provide a cost-effective and accessible tool for studying shock wave interactions.

Main Methods:

• Development of modular shock tube designs with varying diameters (27-79 mm).
• Characterization of pressure-time profiles using high-speed piezoelectric sensors (1 MHz sampling rate).
• Analysis of blast wave parameters, including peak pressure and pulse duration, at different distances.

Main Results:

• Achieved peak pressures ranging from 204 kPa to 1187 kPa with low standard error.
• Pressure-time profiles exhibited true shock fronts and exponential decay, mimicking free-field blast waves.
• Blast wave characteristics remained relevant up to one tube diameter from the opening, with predictable pressure variations.

Conclusions:

• The oxy-acetylene driven shock tube provides a more realistic blast profile than compression-driven tubes, without significant jet effects.
• This design offers reduced operational costs, simpler requirements, and greater accessibility compared to other shock tube systems.
• The developed shock tubes are valuable for sensor testing, armor material assessment, high-rate material property evaluation, biological material response studies, and numerical model validation.