摘要 : The evolution of vortex system in the wakes of the simplified largecivil aircraft afterbody is simulated with the improved delayed detachededdy simulation (IDDES) method and adaptive mesh refinement technology.First of all, the ph... 展开 The evolution of vortex system in the wakes of the simplified largecivil aircraft afterbody is simulated with the improved delayed detachededdy simulation (IDDES) method and adaptive mesh refinement technology.First of all, the physical characteristics of afterbody vortex system arepresented to perform qualitative analysis. Results based on two-dimensionalkinematic analysis demonstrate that three phases show up in vorticalinteraction including formation, wake evolution and wake interaction.Further, two patterns of vortical interaction are clearly identified as follows:strong straining interaction (SSI) and strong rotating interaction (SRI).Compared with SRI, SSI features considerable circulation decrease of 20%in formation phase and interaction intensity reduction of up to 45% atdownstream wake location of eight-characteristic length. It is attributed tothat the circulation of afterbody primary vortex pair (APVP) has declined information phase due to the remarkable stress deformation imposed byhorizontal tail root vortex pair (HRVP) in SSI, whereas the tip vortex pair(HTVP) obtains a circulation augmentation for more dramatic convectivediffusion and fluid entrainment in SRI. Above all, the inner connectionbetween kinematic characteristics and vortex induced drag is revealedquantitatively, which offers a novel perspective to reduce crusing resistanceof aircraft afterbody. 收起