How does a multi-stage ejector work

The working principle of a multi-stage injector can be summarized as follows:

Structural composition:

A multistage jet pump consists of multiple centrifugal jets superimposed.
Each injector typically consists of a major part such as a working nozzle, a receiving chamber, a mixing chamber, and a diffuser.

Fluid Acceleration & Pressure Boost

Inside the ejector, a high-pressure fluid (working fluid) is injected through the nozzle at high speed, forming a high-velocity fluid jet.
Due to the turbulent diffusion of the jet boundary layer, the working fluid is mixed with the surrounding low-pressure fluid that is sucked (the ejection fluid) and energy is exchanged.
The mixed fluid is velocity equalized in the mixing chamber with an increase in pressure.

Step-by-step pressurization

In a multi-stage ejector, the pressure and velocity of the fluid increases with each passing through the first stage of the ejector.
The inlet pressure of the injector of the next stage will be higher than the outlet pressure of the previous stage, so that the effect of step-by-step pressurization can be achieved.

Fluid Output

After multi-stage pressurization, the fluid is finally discharged at high pressure from the outlet of the injector.
The output high-pressure fluid can meet a variety of application scenarios that require high-pressure fluids, such as high-pressure water cutting, oil extraction, etc.
To sum up, the multi-stage ejector realizes the purpose of converting low-pressure fluid to high-pressure fluid through the superposition and step-by-step pressurization of multiple injectors.