| Citation: | CUI Xingda，ZHANG Lu，LIU Fan，et al.Numerical simulation on aerodynamic interference of UAVs like X⁃47B in rhombus formation［J］.Journal of Aerospace Power，2022，37（8）：1692‑1702. doi: 10.13224/j.cnki.jasp.20210125
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A rhombus formation composed of 4 unmanned aerial vehicles (UAVs) like X‑47B with flying wing configuration was designed.By solving the RANS equations,the aerodynamic interference of UAVs in rhombus formation flight was studied,and the related mechanism was analyzed in detail.The effect of formation drag reduction was given quantitatively.Computational results showed that the aerodynamic performance of head UAV remained unchanged,and the drag reduction of wing UAVs affected by upwash flow was obvious,but the drag of tail UAV mainly affected by downwash flow increased,making it unfavorable to the long voyage of formation.Under the condition of gravity balancing,the reduction of flight drag of wing UAVs was caused by the decrease of attack angle and induced drag,while the increase of flight drag of tail UAV was mainly caused by the increase of attack angle,and the induced drag only brought 20% of flight drag increase of tail UAV.In order to reduce the adverse effect of downwash flow on tail UAV,the aerodynamic characteristics of tail UAV with different vertical spacing were studied.According to the behavior mechanism of head bird transformation in geese,the flying suggestions of rhombus formation were given.
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