A novel underwater thrust vectoring method based on cross second flow was proposed. In this method

the main flow can be deflected by the flow field induced by the cross second flow. A mathematical model relating the thrust vectoring angle to the flow vectoring angle was established. This model validated the feasibility of thrust vectoring through flow deflection. The effects of the depth of the second flow

the volume ratio as well as the velocity ratio of second flow to the main flow on the deflection angle were studied through numerical method. The numerical results showed that the deflection angle of the main flow decreased with the increase of the depth because of the variation of the adverse pressure at the nozzle. With the decrease of the volume ratio the deflection angle increased. And when the volume ratio was lower than a specific value

the deflection angle didnt vary any more. The deflection angle increased with the velocity ratio

and at a certain velocity ratio

the magnitude of the velocity had no effect on the deflection angle. Based on these numerical results

an underwater thrust vectored propulsor was designed. The simulation about this propulsor reveals that the maximum deflection angle can be realized when all the second jets at the same side of the midship section of the main flow are activated simultaneously. The deflection direction of the main flow can be controlled through activating different groups of second jets.