Combination power axisymmetric variable geometry intake port, engine and intake port control method

Abstract

The invention discloses a combined dynamic axisymmetric variable geometry inlet, which comprises a housing, a center rod and a connection support. The center rod and the housing are connected through the connection support. The combined dynamic axisymmetric variable geometry inlet also comprises a central cone which contains two independent parts: a front hemicone and a rear hemicone. Radius of the central cone at the juncture of the front hemicone and the rear hemicone is the largest. A driving device is arranged inside the center rod and can respectively drive the front hemicone and the rear hemicone to move along the axial direction of the center rod. A gap between the front hemicone and the rear hemicone is a boundary layer suction groove which is a 360-degree circumferential notch. The inside of the central cone and the inside of the connection support are both hollow. Size of the boundary layer suction groove of the air inlet is not fixed but freely adjusted with the change of incoming flow conditions. In addition, the boundary layer suction quantity of the air inlet is always in the optimal state under different incoming flow conditions, so as to reduce influence on aerodynamic performance of the air inlet.

Description

technical field [0001] The present invention relates to a combined power axisymmetric variable geometry inlet port and its control method, in particular to a boundary layer suction device and its control method based on the geometric adjustment law of the combined power axisymmetric variable geometry inlet port. The utility model belongs to the field of air inlet aerodynamics. Background technique [0002] Due to the effect of gas viscosity, in the thin flow layer close to the surface of the object, the flow velocity of the gas flow is very low, and the layer area with a large velocity gradient along the normal direction of the object surface is called the boundary layer. In the boundary layer, the viscous force cannot be ignored. The existence of the boundary layer in the intake port greatly affects the aerodynamic performance of the intake port. On the one hand, it reduces the non-viscous flow area of ​​the intake port. Research shows that under the flow Mach number of 2....

AI Technical Summary

Problems solved by technology

At present, the size of the boundary layer suction device on the inlet duct at home and abroad is fixed, and the above effects cannot be achieved.

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