Abstract: In order to solve the problem of difficulty in extinguishing tree crown fires of a certain height or surface fires of a certain degree and low efficiency of extinguishing in forest fires, the author designed a crawler forest wind fire extinguisher. In this study, the overall structure of the crawler forest wind fire extinguisher was designed, and the core component of the telescopic air duct was theoretically calculated and structured. Through the simulation of different shapes of air ducts, the speed cloud diagram of the air outlet was obtained, and the shape of the air duct of the design was determined. The design was compared with the actual fire extinguishing simulation of the 6MF-32 portable wind fire extinguisher to verify the optimal design parameters. The simulation results show that this study can meet the fire extinguishing requirements under specific heights and specific conditions, greatly improve the efficiency of fire extinguishing, and reduce the risk of firefighters participating in fire fighting operations.

Key words: wind fire extinguisher, telescopic air duct, finite element analysis, structural design