Simulation on Release Characteristics of the Gas Extinguishing Agent in Fire Extinguisher Vessel with Different Filling Conditions Based on AMESim

摘要

To study the release characteristics of the gas extinguishing agent from fire extinguisher vessel at different filling conditions, a gas fire extinguishing agent jet test platform was established. The calculation model of jetting gas extinguishing agent from gas extinguisher vessel was constructed with AMESim and the jet performance of gas extinguishing agent was simulated by using the two-phase flow model. By changing the initial temperature and filling pressure, the pressure changed at the outlet of the vessel is simulated, and then the change of the outlet pressure and the discharge time were analyzed emphatically. The results showed that the outlet pressures of the fire extinguisher vessel had the same trend basically at different initial temperature; all of them declined rapidly with the jetting time and then tended to be gentle. When the filling pressure was lower, the outlet pressure of the vessel at different initial temperature was quite various, and the sudden slope change could be seen obviously during the discharge process at higher initial temperature. When the initial temperature ranged from -30 *C to 30 °C, the jetting time shortened with the rising of the initial temperature at different filling pressure. In addition, the outlet pressure of the fire extinguisher vessel tended to be flat with the rapid decrease in the injection time. At different filling pressures, the outlet pressure of the vessel declined rapidly with the jetting time and then tended to be gentle.