Influence of velocity gradient on the ground vortex characteristics of inlet with hyperbola profile lip
When an aero-engine is running near the ground,the vortex formed by the ground effect may cause intake distortion,which in turn affects the working stability of the engine.A certain type of inlet based on hyperbolic lip design was taken as the research object,and the effects of different velocity gradients on the flow field structure of the inlet and the aerodynamic characteristics of the ground vortex were analyzed by numerical calculation methods.The research results show that:under headwind conditions,the ground vortex fields corresponding to the three velocity gradients have similar shapes,and they are all counter-vortex structures with opposite rotations.When the velocity gradient is small,the hyperbolic lip effectively prevents the inhalation of the ground vortex line.With the increase of the velocity gradient,the intensity of the ground vortex decreases continuously,but the pressure distortion at the inlet gradually increases due to the weakening of the effect of the hyperbolic lip to prevent the inhalation of the ground vortex line.
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