A self-sustaining fluid oscillator and rocket-based combined cycle engine

Abstract

The invention discloses a self-supporting fluid oscillator and a rocket-based combined cycle engine. The oscillator includes a partition plate, and on the same surface of the partition plate along the length direction, there are: concave cavities, along which the partition plate through the width direction of the partition plate; the slope structure includes a plurality of slopes arranged at intervals along the width direction of the partition plate; one end of each slope communicates with the concave cavity, and the other end is along the length direction of the partition plate Gradually slope upwards to the upper surface of the divider. It is used to solve the problems of complex structure, difficult installation, single excitation frequency, poor mixing effect, and low adaptability in the prior art. It can use supersonic concave cavity flow to self-sustain high-frequency pressure pulsation, and combine with slope configuration to induce flow direction vortex The structure, through the energy of the supersonic airflow itself, achieves the purpose of mixing enhancement.

Description

technical field [0001] The invention relates to the field of flow control technology, in particular to a self-sustained fluid oscillator and a rocket-based combined cycle engine for supersonic mixing enhancement, and in particular to a mixing enhancement device capable of producing obvious three-dimensional effects and high-frequency disturbances. Background technique [0002] In aerospace engines, the problem of mixing two air streams is widely involved. Taking the rocket-based combined cycle engine as an example, the rapid mixing of fuel and air is the core technology of the engine design, which is directly related to the working performance of the engine. According to the difference in the mode of action, the hybrid enhancement technology can be divided into two aspects: active hybrid enhancement and passive hybrid enhancement. [0003] Active mixing enhancement technology actively applies external excitation through the exciter to stimulate the growth of unstable waves ...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a self-sustaining fluid oscillator and a rocket-based combined cycle engine, which are used to overcome the defects in the prior art such as complex structure, difficult installation, single excitation frequency, poor mixing effect, and low adaptability, and utilize supersonic concave cavity flow It can generate self-sustaining high-frequency pressure pulsation, combined with the slope configuration to induce flow direction vortex structure, and achieve the purpose of mixing enhancement through the energy of supersonic air flow itself; it has the advantages of both active mixing technology and passive mixing enhancement technology, and has obtained more good mix enhancement

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