Numerical simulation of initial velocity of fire extinguishing agent in forest fire bomb explosion based on SPH FEM algorithm

DOI:	10.11809/bqzbgcxb2024.08.015
Keywords:	forest fire extinguishing bombs; Gurney’s formula; SPH FEM coupling algorithm; charge structure; explosion throwing simulation
Abstract:	In order to solve the problem of explosion and dispersion of forest fire extinguishing bombs, the initial velocity of explosion and discharging of fire extinguishing agent was studied by LS DYNA software. According to the data of the explosion and scattering experiment of forest fire extinguishing bombs, the Gurney formula was modified. A simulation model of forest fire extinguishing bombs was established, and the initial velocity of the fire extinguishing agent obtained by the simulation model was compared with the initial velocity of the fire extinguishing agent obtained by the modified Gurney formula, so as to verify the feasibility of the SPH FEM coupling algorithm to study such problems. The structure of the charge of the forest fire extinguishing bomb was optimized, and the influence of the stepped charge structure on the initial velocity of the fire extinguishing agent was analyzed. The results show that the modified Gurney formula can be better applied to the calculation of the initial velocity of the fire extinguishing agent. The initial velocity of the extinguishing agent simulated by the SPH FEM coupling algorithm is in good agreement with the initial velocity of the extinguishing agent obtained by the modified Gurney formula, which indicates that it is feasible to study such problems by using the SPH FEM coupling algorithm. The stepwise improvement of the charge structure of forest fire extinguishing bombs can increase the area of fire extinguishing agent and improve the uniformity of fire extinguishing agent dispersion, and improve the efficiency of forest fire extinguishing bombs.
Issue:	Vol. 45 No. 8 (2024)
Published:	2024-09-02
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