喷水推进舰艇自航运动数值计算研究

Water-jet propulsion ship has been the focus of researchers both at home and abroad because of its rapidity and high maneuverability. The T-craft landing model ship was taken as the research object, and the VOF method and SST k-ω turbulence model were adopted in the Reynolds-Averaged Navier-Stokes calculation framework to calculate the self-propelled motion of waterjet propulsion ship. The comparison with the calm water resistance and the experimental results of a single jet pump verifies that the numerical calculation method has a high calculation accuracy. Meanwhile the numerical simulation of'boat pump integration' under designed speed was carried out, the wave pattern and the flow field evolution process of the water-jet propulsion ship at different times under designed speed were analyzed, and the resistance and the attitude changes of the model ship under towing and self-propelled were compared and analyzed. The results show that the wave height of the hull is symmetrical and even on both sides. Compared with the towed hull, the self-propelled resistance, trim and draft increase. The streamline of the hull and the nozzle are uniform and there are tiny whirlpools at the rotor. The velocity nonuniformity coefficient of the flow from the rotor inlet to the nozzle is reduced by 86%, showing a more uniform state at the nozzle. From the inlet to the outlet of the blade, the blade load first increases and then decreases. Further analysis shows that the load at the relative position of the middle streamline at 0.6-0.8 is larger, indicating that the function of the latter half of the blade is stronger than that of the former.