A kind of inner bulging S-curved air inlet with intermediate control section and method

Abstract

The invention relates to an inner bulging S-bend air inlet with an intermediate control section and its method, which belong to the technical field of aircraft; it includes the first S-bend section of the air inlet and the second S-bend section of the air inlet, and the interface between the two is in the middle Control section; the middle control section is used as the exit of the first S-curve section, and at the same time as the entrance of the second S-curve section; the middle control section is in a concave shape, consisting of four tangent arcs of upper, lower, left and right, Among them, the upper and lower arcs have the same center and center angle, and the center is located above the section; the upper arc of the middle control section is concave toward the center line of the air inlet, so that the inner surface above the air inlet corresponds to the middle control section The position forms an inner bulge structure. The present invention introduces an inner bulge structure, and through the middle control section, the airflow is reversely deflected twice inside the pipe, realizing the omnidirectional shielding of the internal parts of the air inlet and the blades of the compressor, so that the air inlet is deflected at the center of the inlet and outlet surfaces. It has better radar stealth performance when the distance 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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