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对极小展弦比背鳍进行了风洞实验和CFD分析。研究表明:亚声速大迎角下背鳍涡破裂影响不严重,且涡破裂迎角较大;正侧滑通常使背鳍法向力增加,负侧滑使法向力降低;CFD分析证实了大负侧滑条件下翼片法向力会变成负值,从而引起十字翼在倾斜条件下滚转力矩发生突变。
Wind tunnel experiments and CFD analysis were performed on minimal aspect ratio dorsal fins. The results show that the dorsal fin vortex rupture is not serious and the angle of vortices rupture is relatively large at high angle of attack. Positive lateral slip generally increases the normal force of the dorsal fin and the negative side slip decreases the normal force. CFD analysis confirms the large negative Flap normal force will become negative under the condition of slippery, causing the cross-wing to make a sudden change of rolling torque under the condition of inclination.