Abstract
Based on the two-phase flow theory and the Peng-Robinson equation, a mathematical model of an airplane fire extinguishing system is propoesed. The flow characteristics of the extinguishing system under different filling pressures and initial temperatures were studied. It is found that at 5.75 kg of agent charge, the filling pressure can influence the discharge rate of bottle, and this effect decreases with increasing pressure. The emptying time, storage rate and mass flow rate of the nozzle at 4, 5 and 6 MPa pressures are close to each other, and the fire extinguishing system with a filling pressure of 6 MPa releases all Halon 1301 into the target compartment when 1.035 s. The initial temperature had a small effect on the discharge efficiency of the system, with the temperature at which the airplane was cruising being the least favorable for agent discharge. The flow rate at each nozzle is strongly influenced by the initial temperature. The initial temperature affects the in-tube distribution of Halon 1301, where only about 12 % of Halon 1301 is emitted from nozzles 3 and 4, and this value may decrease to 3.6% as the initial temperature decreases.
Published Version
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