A Double-layer Cooling Mixing Tube Ejection Infrared Suppressor

Abstract

The invention provides a double-layer cooling mixing tube ejection type infrared suppressor, which comprises an inner and outer double-layer mixing tube, a wave lobe nozzle and a hollow flow director with a slit. The invention adopts the upper and lower asymmetric lobe nozzles, so that each part of the high-temperature exhaust gas can be just attached to the wall at the outlet of the mixing pipe, and the momentum of the high-temperature exhaust gas is utilized to the greatest extent, so as to inject as much cold air from the outside as possible; The forced cooling airflow is passed through the forced air inlet of the pipe, and the forced cooling airflow flows through the interlayer between the double-layer mixing tubes to cool the wall surface of the mixing tube; the forced cooling airflow flows into the inner mixing tube through the slits of the hollow split guide plate, and is connected with the heat exhauster. Air mixing to further reduce the exhaust temperature; the hot exhaust gas in the double-layer mixing tube passes through the hollow split guide plate to generate multiple flows, which improves the mixing uniformity between the high-temperature exhaust gas and the ejected cooling airflow; the double-layer cooling mixing tube is adopted The ejector infrared suppressor can greatly reduce the wall temperature and exhaust temperature of the mixing pipe, and reduce its infrared radiation intensity.

Description

Technical field [0001] The present invention relates to a double-layer cooling mixing tube reflective infrared suppressor, belonging to the design and infrared suppression technology of aerospace engine exhaust system. Background technique [0002] Due to its good motor performance, armed helicopters can not only implement accurate blows on the ground and ultra-low-altitude targets, but also used to implement an important military task such as emergency transportation, air commands, air warnings, which has become an important routine weapon in modern war. However, with the rapid development of infrared imaging detection system, airborne infrared front and new infrared guidance weapons, the sensitivity of infrared detection equipment and the system recognition ability have significantly improved, and the level of hitting of infrared guidance weapons greatly improved, making it hot The threat that the armed helicopter of the power promotion system has been increasingly serious in m...

AI Technical Summary

Problems solved by technology

The second-generation infrared suppressor can greatly reduce the temperature of the exhaust exhaust flame and shield the hot-end components, but compared with the fuselage, the exposed outer mixing tube and exhaust flame are still high-temperature hot spots, because the second-generation infrared The suppressor is only an additional component at the rear of the engine system, and is greatly limited in shape and size. In this context, the third-generation infrared suppressor with the integrated design of the infrared suppressor and the fuselage was developed.

The lobe nozzle-inner mixing tube is the core component of the integrated infrared suppressor. At present, our understanding of its complex aerodynamic mixing performance and infrared stealth effect is almost blank

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