Numerical Simulation of the Internal Flow of a Three-dimensional Thrust-Vectoring Nozzle

摘要

In the present study, a simulation model of a three-dimensional thrust-vectoring nozzle has been developed, and the simulation analyses for the flow of a three-dimensional thrust-vectoring nozzle have been performed under various deflecting angles. The results obtained from the present numerical simulation show that for a small radius of curvature of the deflector section, the predicted thrust decreases significantly with increasing deflecting angles, since a recirculating flow exhibits locally when the deflecting angle is large, reducing the average exhaust velocity. By enlarging the radius of curvature of the deflector section, the recirculating flow occurring at large deflecting angles vanishes gradually, and the average exhaust velocity would not drop significantly. The thrust at a large deflecting angle is thus maintained at the same level as that without deflection. It is also noted that the thrust is lower with a larger angular speed of the deflecting nozzle at the same deflection angle.