Subsonic aircraft air inlet channel

Abstract

The invention discloses a subsonic aircraft air inlet channel which comprises an air inlet channel opening face, the bottom of the air inlet channel opening face is connected with an aircraft body and is integrally fused with the machine body, the rear end of the air inlet channel opening face communicates with an air inlet channel inner channel, a flow separation plate is fixedly supported in the air inlet channel inner channel, and the air inlet channel opening face is surrounded by a lip cover; the front side of the air inlet opening face is provided with a similar triangular step compression surface, the similar triangular step compression surface is fixed on the machine body, and the lip cover is in smooth connection with the machine body and the similar triangular step compression surface. According to the structure, a boundary layer separation channel independently arranged on the machine body is canceled, and a bulge protruding out of the surface of the machine body is replaced by the similar triangular step compression surface; meanwhile, by means of integrated fusion of the sweepback lip cover, the air inlet channel opening face, the similar triangular step compression face and the machine body, the boundary layer of the machine body can be effectively eliminated, the high total pressure recovery coefficient and the low flow field distortion index of the air inlet channel are kept, and meanwhile the attack angle and sideslip angle characteristics of the air inlet channel can be considered.

Description

technical field [0001] The invention relates to the technical field of aircraft design, in particular to an air inlet of a subsonic aircraft. Background technique [0002] As the "breather" of the air-breathing propulsion system, the intake is responsible for capturing, compressing, and rectifying the airflow. Its design features and working characteristics have a significant impact on the engine's working efficiency. Subsonic aircraft is the most widely used type of air-breathing aircraft, and the inlets of its power system generally have pitot-type inlets, S-curved inlets, and buried inlets. Considering factors such as engine installation and inlet performance, most modern advanced subsonic aircraft use S-curved inlets. [0003] In order to prevent the air inlet from inhaling the low-energy flow in the boundary layer of the fuselage surface, the traditional S-curved air inlet usually lifts the inlet of the air inlet from the surface of the fuselage by setting special boun...

AI Technical Summary

Problems solved by technology

Due to the excellent comprehensive performance of the inlet without boundary layer, it has been widely used in the inlet of subsonic aircraft, especially the unmanned aircraft that focus on stealth and drag reduction, such as the X-45A and X-45C of the United States. , but because there is no boundary layer partition, this kind of inlet cannot completely exclude the incoming boundary layer, and its performance is generally not as good as that of an inlet with a partition

For aircraft such as X-45A and X-45C, the inlet is arranged above the fuselage close to the nose, and the boundary layer before the inlet is thin, so the working conditions are not bad, and the performance is generally not low, but the performance when there is an angle of attack poor

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