Infrared suppression device and method for S-shaped spray pipe based on synthetic jet flow

Abstract

The invention discloses an infrared suppression device for an S-shaped spray pipe based on synthetic jet, an outlet of the S-shaped spray pipe is in a flat rectangular shape, the device comprises a synthetic jet exciter arranged on the short edge of the outlet of the S-shaped spray pipe, the synthetic jet exciter comprises an air cylinder, a piston is arranged in the air cylinder, an air inlet gap is formed in the cylinder wall of the air cylinder, and the air inlet gap is communicated with the air inlet gap; when the piston moves to a lower dead center position, the air inlet seam is communicated with the internal space of the cylinder, a jet pipe is arranged at the end of the cylinder, the piston is connected with a driving mechanism, and the driving mechanism can drive the piston to reciprocate in the cylinder; according to the device, a synthetic jet flow exciter is arranged on the short edge of an outlet of an S-shaped spray pipe, and infrared suppression is carried out in the mode that jet flow mixing is carried out on the interior of the short edge of the outlet of the S-shaped spray pipe; and the air cylinder with the air inlet seam is utilized, so that the problems that steady-state jet flow and pulse jet flow need air entraining, and the performance of the piston type synthetic jet flow exciter is reduced due to the fact that excessive high-temperature fuel gas is sucked in are solved.

Description

technical field [0001] The invention belongs to the technical field of infrared suppression for aircraft S-bend nozzles, and more particularly relates to an infrared suppression device and method for S-bend nozzles based on synthetic jets. Background technique [0002] Improving the infrared stealth performance has become the research and development direction of modern aircraft. The research shows that the infrared radiation of the aircraft mainly comes from the skin and exhaust system; when Ma<2.0, 90% of the infrared radiation (3-5μm) of the aircraft comes from the exhaust system, and the working band of the active infrared guided missile seeker is mainly in the 3-5 μm band. Therefore, suppressing the infrared radiation of the aircraft in the 3-5 μm band is of great significance to improve the survivability of the aircraft battlefield. [0003] The aircraft tail jet is the main source of infrared radiation in the exhaust system. Due to its wide detection range in the f...

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Problems solved by technology

[0004] The object of the present invention is to aim at the deficiencies in the prior art, to provide a kind of infrared suppression device and method for S curved nozzle based on synthetic jet, this device is arranged on the short side of the outlet of described S curved nozzle The synthetic jet exciter adopts the method of jet mixing to the short side of the outlet of the S-curved nozzle for infrared suppression; and uses a cylinder with an air inlet slot to solve the problem of bleed air and piston for steady jet and pulse jet. The problem that the synthetic jet actuator sucks too much high-temperature gas and its performance declines

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