Mitigation of TNT and Destex explosion effects using water mist

Area of Science:

• Explosion dynamics
• Blast mitigation technologies
• Aerosol science

Background:

• High explosives (HE) detonation generates significant overpressures.
• Effective mitigation strategies for explosion-induced overpressures are crucial for safety.

Purpose of the Study:

• To investigate the effectiveness of water mist in reducing explosion overpressures.
• To quantify the mitigation effects of water mist on TNT and Destex detonations.

Main Methods:

• Detonation experiments were conducted in a chamber using 50 lb equivalent charges of TNT and Destex.
• Overpressures were measured with and without preemptively sprayed water mist.
• A droplet analyzer characterized water mist properties (concentration, Sauter Mean Diameter).

Main Results:

• Water mist reduced impulse, initial blast wave, and quasi-static overpressure by up to 40% for TNT and 43% for Destex.
• Optimal mitigation was observed with water mist sprayed 60s prior to detonation at 70 g/m³ with a 54 µm droplet SMD.
• Significant reductions in blast effects were achieved, demonstrating the efficacy of water mist.

Conclusions:

• Water mist technology shows significant promise for mitigating overpressure effects from high explosive detonations.
• The findings support the potential application of water mist systems in enhancing safety in explosive environments.