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A dual-throat nozzle capable of changing throat area and outlet area and method thereof

An outlet area and dual-throat technology, which is applied to jet propulsion devices, machines/engines, etc., can solve the problem of difficulty in realizing the function of dual-throat nozzles, and achieve a mechanism with easy movement, strong practicability, and simple and reasonable structure. Effect

Active Publication Date: 2022-05-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Otherwise, it will become a pure converging nozzle, and it is difficult to realize the corresponding function of the double-throat nozzle

Method used

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  • A dual-throat nozzle capable of changing throat area and outlet area and method thereof
  • A dual-throat nozzle capable of changing throat area and outlet area and method thereof
  • A dual-throat nozzle capable of changing throat area and outlet area and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 2The nozzle structure shown is taken as an example of a traditional binary double-throat nozzle (axisymmetric nozzle and expansion type nozzle are implemented in a similar way, and will not be described in detail), by combining the concave cavity expansion section and the concave cavity convergence section Connection point 10A is obtained by moving back on the slide rail to 10B. According to the diagram, it can be seen that the connection point 9A between the converging section of the nozzle and the expansion section of the concave cavity also moves back to 9B synchronously; The convergent section not only moves backward, but also rotates outward at the same time, causing the exit of the nozzle to move backward, and also increases the area of ​​the exit of the nozzle. , are expanded in length and height, realizing the synchronous adjustment of the first throat (nozzle geometric throat section) and the second throat (nozzle outlet) of the double throats....

Embodiment 2

[0034] Under the action of the power output of the power drive device, the converging section 5A of the concave cavity rotates counterclockwise around the connection point 10A (10B) to the position of the converging section 5B of the concave cavity, the outlet of the nozzle changes from 6A to 6B, and the outlet area of ​​the nozzle also changes. Increase synchronously, still equal to the area of ​​the throat; if the converging section 5A of the cavity rotates counterclockwise to the position of the converging section 5C of the cavity, the exit of the nozzle changes from 6A to 6C, and the area of ​​the exit of the nozzle will be larger than the area of ​​the throat. , the nozzle is an expansion type double-throat nozzle. Conversely, under the action of the power output of the power drive device, when the connection point 10B moves forward to the position of the connection point 10A and the converging section 5B (or 5C) of the cavity rotates clockwise to the position of the conve...

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Abstract

The invention discloses a double-throat nozzle capable of changing the throat area and outlet area and a method thereof. The double-throat nozzle includes a nozzle inlet, a nozzle outlet, and a fixed section at the front of the nozzle, a nozzle convergence section, a concave cavity expansion section, and a concave cavity convergence section that are sequentially connected between the nozzle inlet and the nozzle outlet. Each section of the pipe body profile is connected by a hinge, and the hinge axis a at the connection point between the concave cavity expansion section and the concave cavity convergence section is installed on the slide rail; the laying direction of the slide rail is consistent with the spray The axial directions of the tubes are consistent; the hinge shaft a is connected to the power output end of the power drive device A; under the action of the power drive device A, the hinge shaft a can slide along the slide rail. Therefore, the present invention utilizes the power drive device to change the position of each movable part, so as to realize the adjustment of the nozzle throat area and the outlet area; it has the advantages of simple and reasonable structure, easy realization of mechanism movement mode, obvious benefit and strong practicability.

Description

technical field [0001] The invention relates to the field of aero-engines, in particular to a novel structure applied to an aero-engine exhaust system, in particular to a double-throat nozzle capable of changing the throat area and outlet area and a method thereof. Background technique [0002] The fixed-geometry aerodynamic vectoring nozzle has a constant geometric structure and ingenious fluid control methods, and has become a research hotspot in the field of aero-engine exhaust systems. Among them, the double-throat aerodynamic vectoring nozzle is currently the main research object because of its small thrust loss, large and stable vector deflection angle, and high vector efficiency. For the fixed geometry aerodynamic vector nozzle, the change of the throat area is mainly achieved by injecting symmetrical secondary flow near the nozzle throat section. In general, a 3% change in equivalent throat area can be achieved using a 1% secondary flow relative flow. However, for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02K1/12
CPCF02K1/12
Inventor 汪阳生徐惊雷黄帅林泳辰蒋晶晶吕郑
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS