Hydrodynamic Force of Ventilated Cavitation with Variable Angle of Attack on a Revolved Body with Streamlined Head

To explore the rule of hydrodynamic force of ventilated cavitation with angle of attack, experiment of ventilated cavitation with angle of attack on a revolved body with streamlined head was conducted by applying the high speed camera system and force measuring system. Some conclusions can be drawn as follows: 1) Under proper ventilation quantity, the formation of ventilated cavitation will reduce the flow resistance, lift and pitching moment of the revolved body model with streamlined head in the experimental range of angle of attack; 2) With increasing ventilation rate, the drag and pitching moment of the model show decreasing tendency, the cavity coverage area enlarges, and both the wetted area of the model and the asymmetric wetted area at centroid front reduce; 3) With the increase in ventilation rate, the cavitation covering whole lee flow area forms rapidly to cause a sudden increase in the lift coefficient; 4) As the increase of ventilation rate continues, the length of ventilated cavitation on incident flow side elongates, and the lift coefficient decreases; and 5) The drag, lift force and pitching moment tend to be stable until the increase in ventilation rate does not result in obvious change of cavitation morphology. This research may provide a reference for trajectory design of underwater ventilated cavitation vehicles.