Three-level multi-spray-pipe central ejector

Abstract

The invention discloses a three-level multi-spray-pipe central ejector, which comprises a first-level multi-spray-pipe central ejector (1), a second-level multi-spay-pipe central ejector (2) and a third-level multi-spray-pipe central ejector (3), wherein the first-level multi-spray-pipe central ejector (1), the second-level multi-spray-pipe central ejector (2) and the third-level multi-spray-pipe central ejector (3) are sequentially connected with one another in serial along the flowing direction of main airflow, and an expansion joint (4) is respectively arranged between the first-level multi-spray-pipe central ejector and the second-level multi-spray-pipe central ejector and between the second-level multi-spray-pipe central ejector and the third-level multi-spray-pipe central ejector. The three-level multi-spray-pipe central ejector has the advantages of good pumping effect and convenience in machining and manufacturing.

Description

technical field [0001] The invention relates to a multi-stage ejector, in particular to a three-stage multi-nozzle central ejector. Background technique [0002] The ejector is a kind of gas machine, which usually consists of the following four parts: the ejector nozzle, the ejected air duct, the mixing chamber, and the diffusion section. It relies on the action of a high-pressure airflow to increase the total pressure of the low-pressure airflow, and transfer energy from one airflow to another through turbulent mixing. Specifically, the ejected airflow with a high total pressure comes out of the nozzle at a high speed and enters the mixing chamber, and forms a low static pressure at the front of the mixing chamber, and the ejected airflow that is always depressed at the front of the mixing chamber When the two airflows flow along the mixing chamber, turbulent mixing occurs, and part of the kinetic energy of the ejected airflow is transferred to the ejected airflow. As a re...

AI Technical Summary

Problems solved by technology

However, compared with the multi-nozzle central ejector, the friction loss per unit length of the mixing chamber of the annular ejector is large, and the mixing process of the ejected airflow and the ejected airflow is relatively slow, resulting in a large structure size and low mixing efficiency.

Especially for large-scale wind tunnels, the disadvantages of annular ejectors become more obvious

The flow rate of the ejected airflow in a large-sized wind tunnel is large, and the corresponding flow area is large. The center of the ejected airflow is not easily affected by the ejected airflow. The complete mixing of the two airflows is difficult and the mixing efficiency is low.

Moreover, in terms of structure, the length of the mixing chamber of the annular ejector must be lengthened, resulting in a huge structure of the annular gas collection chamber, and the corresponding pressure-bearing flanges and other components are not easy to process, etc.

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