Low infrared signature lobe injection mixing device used for two-dimensional nozzle outlet

Abstract

The invention provides a low infrared signature lobe injection mixing device used for a two-dimensional nozzle outlet. The low infrared signature lobe injection mixing device comprises a rectangular transition section, lobe sections, lobe transition sections and separated cold and hot flow channel sections. A traditional two-dimensional nozzle molded surface cannot effectively shield inner high temperature parts (a center cone, a support plate and a mixer) of an exhaust system, while the special lobe molded surface and baffle plates in separated cold and hot flow channels of the device can effectively shield the high temperature parts, and the detectable infrared radiation of the high temperature parts is reduced; the separated cold and hot flow channel sections separate high temperature combustion-gas flow from injected cold air flow, so that the resistance of cold air flow injection is effectively decreased, and the injection quantity of cold air flow is guaranteed to be quite considerable; and besides, cold flow and hot flow are mixed at the outlet of the device, so that the temperature of the jet flow is greatly decreased, and the infrared radiation of the jet flow can be reduced.

Description

technical field [0001] The patent of the present invention relates to the technical field of suppression of infrared radiation characteristics of aircraft, specifically, it mainly relates to a low-infrared characteristic lobe ejection mixing device for binary nozzle outlets. Background technique [0002] Under the threat of the current complex electromagnetic search and detection environment and advanced ground-to-air and air-to-air weapons and equipment, the battlefield survival environment of aircraft is deteriorating day by day. How to improve the survivability of aircraft on the battlefield and implement effective attacks against the enemy has become one of the key technologies that modern warfare urgently needs to develop. According to statistics, in several air battles since the 1980s, aircraft shot down by infrared guided missiles accounted for 70-80% of the total number of aircraft shot down in the war. Mainly the threat of third-generation infrared air-to-air missi...

AI Technical Summary

Problems solved by technology

[0006] Judging from the existing literature, the main profile characteristics of the current traditional binary injection nozzles (such as long casing binary injection nozzles, short casing binary injection nozzles, etc.) are The outlet is covered with a binary cylinder with a slightly larger equivalent diameter. The binary injection nozzle obtained in this way has very limited enhancement of the shielding effect on the high-temperature parts inside the nozzle, that is, the infrared radiation suppression effect on the solid wall is very limited. ; Secondly, the high-temperature gas flow of the nozzle and the cold air flow ejected from the nozzle begin to mix at the cross-sectional position of the nozzle outlet. Relatively large, resulting in a very limited amount of cold flow air outside the injection nozzle, so the traditional injection nozzle has a relatively limited suppression effect on jet infrared radiation

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