Inner-bulge S-bend air inlet channel with middle control section and method

Abstract

The invention discloses an inner-bulge S-bend air inlet channel with a middle control section and a method, and belongs to the technical field of aircrafts. The inner-bulge S-bend air inlet channel comprises an air inlet channel first S-bend section and an air inlet channel second S-bend section, and the interface of the air inlet channel first S-bend section and the air inlet channel second S-bend section is the middle control section. The middle control section serves as an outlet of the first S-bend section and also serves as an inlet of the second S-bend section. The middle control section is inwards concave and is composed of an upper arc, a lower arc, a left arc and a right arc which are tangent, the upper arc and the lower arc have the same circle center and central angle, and the circle center is located above the middle control section. The upper section arc of the middle control section is concave downwards towards the center line of the air inlet channel, so that an inner bulge structure is formed in the position, corresponding to the middle control section, of the upper inner surface of the air inlet channel. The inner bulge structure is introduced, air flow reversely deflects twice in a pipeline through the middle control section, all-directional shielding of components in the air inlet channel and compressor blades is achieved, and the air inlet channel has the good radar stealth performance when the center offset distance of the inlet face and the outlet face is small.

Description

technical field [0001] The invention belongs to the technical field of aircraft, and in particular relates to an inner bulging S-bend air inlet with a middle control section and a method thereof. Background technique [0002] The S-shaped air inlet is widely used in military aircraft and UAVs because of its good stealth performance, and its compact and curved pipe shape also makes it easy to install and integrated shape design. This S-shaped aero-engine inlet can shield the internal components of the engine, effectively increasing the number of bounces of electromagnetic waves in the inlet and weakening the radar echo signal, but it will also be detrimental to the uniformity of the flow field. influences. Both experiments and numerical simulations have demonstrated that drastic changes in the curvature of the S-shaped inlet will cause significant pressure loss and severe flow distortion at the outlet of the inlet, thereby reducing the propulsion efficiency. [0003] At pre...

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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes an inner bulging S-curved air inlet with a middle control section and a method thereof. Through the introduction of the middle control section, on the premise of ensuring the aerodynamic performance of the air inlet, the problem is solved. The radar stealth characteristics of certain incidence angles do not meet the design requirements when the center offset of the inlet and outlet surfaces of the single S-curve inlet is small, and at the same time solve the problem that the middle control section of the traditional double S-curve inlet cannot be parametrically designed

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