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  Numerical study on water jet fire extinguishing system for performance verification

  This paper describes numerical simulation on the water jet extinction system for systematic verification of its performance applied in double deck tunnel in great depth underground space. Numerical model applied is 2D Eulerian multiphase model, and its results is validated with the equation of motion and experiment. Simulation results show that volume fraction of water at all nozzle outlet pressures was less than 0.5. Also, water volume fraction on the ground of tunnel is increased according to an increase in jet discharge pressure in case of 0o of jet inclination angle, while water volume fraction on the ground of tunnel is decreased with an increase in jet discharge pressure in case of 5o and 11o of jet inclination angle. Double deck tunnel in great depth underground space, Water jet extinction system, Eulerian multiphase model, Water volume fraction.

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