Flow field structure of stealth inlet under ground state
In order to find out the cause of bad flow field of the stealthy inlet under the ground state,the flow field structure of the triangular and M-shaped inlets with equal inclined cut surface under the ground state was numerically simulated and analyzed,and the influences of the lip ratio and internal channel offset on the ground working characteristics of the M-shaped inlet were studied.The results showed that a large three-dimensional separated vortex(half flow field)was formed near the inlet symmetry plane in the triangular inlet,while a pair of relatively small vortices were formed at the intersection of the side lip and the upper lip in the M-shaped inlet.Moreover,the distortion index at the outlet of the triangular inlet was too large to meet the inlet/engine matching requirements.With the increase of the proportion of the M-shaped lip,the low total pressure area of the inlet exit section deflected counterclockwise along the sidewall,and the direction of the vortex changed.The total pressure recovery coefficient gradually increased,and the distortion index decreased first and then increased.The increase of internal channel offset could further aggravate the deterioration of flow field under ground conditions.
inclined cut surface inletground working statethree-dimensional separated vortexflow field structuredistortion index
万方数据
维普
