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The motion of combustion gas bubble produced by underwater ignition was developed based on Rayleigh-Plesset equation.Combining the bubble motion equation with the underwater launched vehicle motion equation in the longitudinal plane,a trajectory simulation model with power-launched was established.The hydrodynamic characteristics of underwater ignition at different depths and the trajectory analysis of the underwater vehicle with power-launched were given by simulation.The simulation results have a good agreement with experimental results,and show that the thrust peak caused by underwater ignition and the stable thrust both decrease slightly with the increase of the water depth,and the thrust peak will decline obviously by enlarging the initial radius of gas bubble;the thrust peak generated at the instant of ignition and the low-frequency oscillation of the stable thrust have no significant influence on the trajectory of underwater vehicle.
The motion of combustion gas bubble produced by underwater ignition was developed based on Rayleigh-Plesset equation. Combining the bubble motion equation with the underwater launched vehicle motion equation in the longitudinal plane, a trajectory simulation model with power-launched was established. Hydrodynamic characteristics of underwater ignition at different depths and the trajectory analysis of the underwater vehicle with power-launched were given by simulation. the simulation results have a good agreement with experimental results, and show that the thrust peak caused by underwater ignition and the stable thrust both decrease slightly with the increase of the water depth, and the thrust peak will decline obviously by enlarging the initial radius of gas bubble; the thrust peak generated at the instant of ignition and the low-frequency oscillation of the stable thrust have no significant influence on the trajectory of underwater vehicle.