Prediction method of jet trajectory of fire water monitor

Fire water monitors are fire fighting equipment installed on fire trucks or large space buildings. The precise prediction of jet trajectories is an important guarantee for efficient fire suppression. Based on the Newton's law of motion and the principle of vector differentiation, the differential equations of the theoretical model of the fire water monitor's jet trajectory were determined. Taking into account the jet fragmentation caused by the contact of the water jet with the air, the cross-sectional area and acceleration coefficient were modified. The jet trajectory model proposed in this paper is verified by the actual water jet trajectory, and the range and height errors of the model are less than 2%. This study provides a theoretical reference for the optimization of jet trajectory.