Supersonic ejector

A technology of supersonic speed and ejector, which is applied in the directions of jet pumps, fluid mixers, machines/engines, etc., and can solve the problems of the ejected airflow not having time to expand, interfere, and waste pressure energy, etc., and achieve simple installation, easy processing, The effect of air mixing is sufficient

Active Publication Date: 2015-08-19
CHINA ACAD OF AEROSPACE AERODYNAMICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the existing ejector device, the nozzles for accelerating the ejected airflow are all Laval nozzles, and the layout forms are central nozzles, annular nozzles, and distributed multi-nozzles. It goes out to the mixing chamber and is mixed with the ejected airflow. Under a certain operating pressure, it can exert its high efficiency, but it is very difficult to debug to achieve the best performance. For example, the FD-07 wind tunnel of CAAA currently in operation, in order to match different The main flow of the wind tunnel, the ejector has been running in a

Method used

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[0021] The principles and features of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] When the pressure of the ejector gas source is high, the nozzle is used to expand and compress the gas multiple times, and the series-staged air intake is adopted to improve the mixing efficiency and reduce the pressure loss. Reasonable distribution of air intake between all levels is particularly important for improving ejection efficiency. figure 1 It is the structure diagram of the supersonic ejector. The ejector includes: inlet pressure chamber 1, nozzle 2, mixing chamber 3, nozzle 4, mixing chamber 5, tail nozzle 6, supersonic diffuser 7 and shell cylinder 8. According to the design of the present invention, the above-mentioned nozzle 2 and nozzle 4 are both Laval nozzles, and the peripheral wall of the expansion part is provided with a forward air inlet groove. The nozzle 2, the mixing chamber 3, the nozzle 4, the mixing chambe...

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Abstract

The invention discloses a supersonic ejector. The supersonic ejector comprises a gas inlet pressure chamber, a nozzle with injector, a supersonic diffusion section and a shell cylinder, the nozzle with injector is formed through connecting multiple stages of Laval nozzles with a tail nozzle in series through a mixing chamber after connecting the multiple stages of Laval nozzles in series through the mixing chamber, a forward gas inlet groove is opened in the peripheral wall of the expansion part of each Laval nozzle, the front end of the nozzle with injector is connected with the gas inlet pressure chamber, the outlet of the tail nozzle at the rear end is sleeved in the supersonic diffusion section, and the gas inlet pressure chamber, nozzle with injector and supersonic diffusion section are fixed in the shell cylinder in a mode that the central axes are the same with the central axis of the shell cylinder. The supersonic ejector fully uses the air pressure energy, the gas expands and compresses stage by stage, the mixing is complete, and the efficiency is high; the supersonic ejector uses a central symmetry structure, the manufacturing and processing are easy to perform, and the cost is low.

Description

technical field [0001] The invention relates to a supersonic ejector, in particular to a central nozzle supersonic ejector with supersonic nozzles connected in series and staged air intake, which belongs to the field of aerodynamics. Background technique [0002] Supersonic ejectors are widely used in vacuuming and increasing the total pressure of the ejected gas. Specifically, the ejected air flow with high pressure is ejected from the nozzle at a high speed and enters the mixing chamber. , Under the action of diffusion, the surrounding fluid with low pressure is entrained, the two fluids are mixed in the mixing chamber, and the momentum is exchanged. During the flow process, the speed difference decreases and becomes uniform. And the application of chemical lasers is mature. [0003] The ejector is mainly composed of ejector nozzle, mixing chamber, diffuser and so on. Commonly used nozzle forms include central nozzles, annular nozzles, and multi-point distributed nozzles...

Claims

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Application Information

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IPC IPC(8): F04F5/16B01F5/02B01F5/20B01F3/02B01F23/10
CPCF04F5/16B01F23/10B01F25/20B01F25/72
Inventor 郭孝国王宏亮
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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