Device and method for testing electromagnetic scattering of jet pipe cavity of aeroengine

Abstract

The invention discloses a device and method for testing electromagnetic scattering of a jet pipe cavity of an aeroengine. A device body is wrapped in a pointed-cone-shaped absorbing material to carry out electromagnetic scattering test on the jet pipe cavity, the pointed-cone-shaped absorbing material at the outer wall can absorb most radar waves, electromagnetic wave reflection at the outer wall of a jet pipe model can be effectively shielded during electromagnetic test, electromagnetic reflection at the metal outer wall of the jet pipe model is eliminated, reliable electromagnetic scattering data of the jet pipe cavity is obtained, and the test data can accurately reflect the electromagnetic scattering characteristic of the jet pipe cavity. The test device is simple in structure, low in processing difficulty, low in cost and convenient to operate, can be used repeatedly, and greatly reduces the cost of electromagnetic scattering test of the jet pipe cavity; the test method can be used to obtain accurate and reliable test data; and the test method and device have great significance in researches on electromagnetic scattering of the jet pipe cavity.

Description

technical field [0001] The invention relates to the technical field of aero-engine electromagnetic stealth, in particular to an aero-engine nozzle cavity electromagnetic scattering test device and a test method. Background technique [0002] An important feature of the fifth-generation fighter jet is its ability to stealth, and the aero-engine nozzle, as an electrically large cavity structure, is a strong radar scattering source for the aircraft. important role. The research on electromagnetic scattering characteristics of aero-engine nozzles mainly adopts experimental methods, and the experimental results can guide the design and improvement of aero-engine nozzles. [0003] From the literature published at home and abroad, there is no electromagnetic scattering test device and method for the nozzle cavity of the aero-engine, but there is research data on the electromagnetic scattering test of the air inlet. The body structure is the same in terms of test equipment and tes...

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Problems solved by technology

In "Experimental Research on Electromagnetic Scattering Characteristics and Suppression Technology of Straight Tube Oblique-cut Square-to-Circle Inlet" (Acta Aeronautical Sciences, 1999, Vol. 20, No. 3, pp. 205-210), the The method of pasting the absorbing material on the outer surface of the model weakens the electromagnetic wave reflection on the outer wall surface, and also has the defect of poor electromagnetic wave shielding effect on the outer wall surface

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