Adjustable convergence and diffusion tail spraying pipe

Abstract

The invention discloses an adjustable convergence and diffusion tail spraying pipe. The adjustable convergence and diffusion tail spraying pipe comprises a subsonic speed spraying pipe, a supersonic speed spraying pipe and outer adjusting sheets with elasticity. Subsonic speed adjusting sheets and sealing sheets in the subsonic speed spraying pipe are hinged to the front ends of supersonic speed adjusting sheets and sealing sheets in the supersonic speed spraying pipe. The outer adjusting sheets with elasticity are an extension part of a machine body, an air pressure action cylinder is fixed to the middle portion of each outer adjusting sheet with elasticity, the rear ends of the outer adjusting sheets with elasticity are placed in grooves in the outer sides of the tail ends of the supersonic speed adjusting sheets through protruding lugs in a lapping manner, the protruding lugs on the outer adjusting sheets move in the grooves, and the section area of a spraying pipe outlet is limited. The convergence subsonic speed spraying pipe serves as a fixing convergence section. A multi-adjusting-sheet type spraying port is expanded in a stress application state, and a diffusion section isformed. The tail section of the spraying pipe is adjusted through a hydraulic method, the adjusting-sheet type spraying port is expanded in the stress application state, and the diffusion-section-shaped tail spraying pipe is formed. According to the adjustable convergence and diffusion tail spraying pipe, the structure is simplified, and the weight is reduced. It is guaranteed that gas can be sufficiently expanded so that thrust losses can be reduced, and the thrust utilization rate of an engine is increased.

Description

technical field [0001] The invention relates to the technical field of exhaust nozzles, in particular to an adjustable convergent-diffusion exhaust nozzle. Background technique [0002] The function of the tail nozzle is mainly to make the gas after the turbine continue to expand, fully convert the remaining heat in the gas into kinetic energy, and make the gas eject from the nozzle at a high speed. In the engine of a supersonic aircraft, the total expansion ratio of the gas in the tail nozzle can reach more than 10--20. The non-adjustable converging tail nozzle, also known as the subsonic nozzle with fixed nozzle, has the simplest structure and the lightest weight. However, when the available drop ratio of the nozzle is greater than the critical drop ratio, the gas cannot fully expand in the converging tail nozzle, and the energy loss is small only at low speeds, and a large thrust loss will be caused at high speeds. Therefore, the tail nozzle of a supersonic aircraft mai...

AI Technical Summary

Problems solved by technology

However, problems such as large thrust loss, complex structure, and heavy weight caused by the lack of rationality of the tail nozzle structure have not been resolved.

Images