Numerical Simulation of Gas-Solid Two-Phase Jet in a Non-pressure-accumulated and Handheld Fire Extinguisher

摘要

The ultra-fine dry powder injection process in non-pressure-accumulated and handheld fire extinguishers involves gas-phase and solid-phase two-phase movement The fire-extinguishing effect is closely related to Its jet form. In order to study the jet form accurately, this paper selects the discrete particle model, combines the advantages of Lagrange method and Euler method, and uses CFD simulation software FLUENT to numerically simulate the gas-solid two-phase jet shape of a non-pressure-accumulated and handheld fire extinguisher. And compares the simulation results with the experimental results, analyzes the flow field characteristics inside and outside the cylinder. The results show that the numerical simulation agrees well with the experimental results and can better represent the motion state of the two-phase flow. The numerical simulation results show that the duration of extinguishing agent particles Injection is 1.07s, which is very close to the actual injection duration of 1.13s. The difference between the two is 4.4%. Within the acceptable error range, it is further proved that the simulation results are good agreements with the experiment.