开裂式阻力方向舵流固耦合机理分析

To explore the flow field morphology and fluid-structure coupling mechanism of split drag rudder, computational fluid dynamics (CFD) method is used to calculate the SDR flow field with different crack angles. Based on the dynamic mode decomposition (DMD) method, the flow characteristics and frequency variations of each mode are analyzed. Results show that at the crack angle of 20°, the flow field structure around the wing is mainly composed of the standing vortex in the crack area and the trailing edge shedding vortex, and that the modal frequencies increase with the increase of incoming flow velocity and decrease with the increase of the crack angle. Then the fluid-structure interaction of SDR with different crack angles is calculated. The results show that with the increase of the reduction velocity, the fluid-structure interaction mode of the system develops from the vortex induced vibration to flow instability, and that the instability boundary of the system increases with the increase of the crack angle.