【摘要】 通过对圆截面上翘 1 6°的后体的数值计算 ,研究了上翘后体的流动机理。结果表明 ,上翘后体引起横向流动 ,使横向逆压梯度增大、下表面边界层增厚 ,导致后体出现三维开式分离流动 ;由分离形成一对方向相反、强度相等的旋涡向下游拖至尾迹区 ;这种分离流动是导致大上翘角后体阻力增加的主要原因。更多还原

【Abstract】 The investigation of the flow mechanism on the afterbody of 16°upswept angle an d circle section had been completed by applying a Navier-Stokes method. The resu lts indicated that three-dimensional open separation exists due to the cross flo w around the afterbody, thicker boundary layer and the stronger adverse pressur e gradient on the lower surface. The vortex pair induced by the separation is de veloping downstream into the wake of the after-body. The drag increasing of the larger-upswept afterbody is due to the afterbody separation.更多还原