Low infrared characteristic spray pipe

Abstract

The invention discloses a low infrared characteristic spray pipe. The low-infrared characteristic spray pipe comprises an inner bypass and an outer bypass; an inner bypass main body and an outlet arelocated in a bypass of the outer bypass, a flow channel between the outer bypass and the inner bypass is an outer bypass flow channel, a flow channel in the inner bypass is an inner bypass flow channel, the longitudinal sections of main body parts of the inner bypass and the outer bypass are both circular, an inner bypass outlet is a rectangular outlet with a certain width-to-height ratio throughthe smooth circle-to-rectangle shape from the inner bypass main body to the inner bypass outlet, a stretchable structure is installed at the outlet end of the inner bypass, fluid in the outer bypass flow channel can push the stretchable structure to extend out, the width of the outer bypass flow channel is reduced, and therefore the fluid pressure in the outer bypass flow channel is increased; andpart of flow at an inlet of the outer bypass is forced to flow into the inner bypass, and the bypass ratio of the inner bypass to the outer bypass is passively adjusted. According to the low infraredcharacteristic spray pipe, the flow section area is adjusted through the change of bypass airflow pressure, and the problem that the bypass ratio is changed abnormally when the S-shaped bent rectangular spray pipe with the low infrared radiation characteristic is used is effectively solved.

Description

technical field [0001] The invention relates to the field of aero-engine structural design, in particular to a ceramic-based turbine rotor structure, and in particular to a low-infrared characteristic nozzle. Background technique [0002] With the development of infrared signature technology, the demand for infrared stealth of aircraft is gradually increasing. The infrared radiation in the 3-5um band of the aircraft mainly comes from the high-temperature components of the aero-engine, and the infrared radiation of the high-temperature components accounts for more than 70%. For components such as the turbine, afterburner, and central cone, it is difficult to adopt cooling measures due to their special aerodynamic and thermal environments. Therefore, the S-curved nozzle is used to shield the infrared radiation characteristics of high-temperature components. It is an efficient infrared suppression measure. Such as figure 1 As shown, after using the S-curved nozzle, the high-...

AI Technical Summary

Problems solved by technology

The cross-sectional area of ​​the flow is adjusted by the change of the pressure of the bypass airflow, which effectively solves the problem of abnormal changes in the bypass ratio when the S-curved rectangular nozzle with low infrared radiation characteristics is used.

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