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1. Operating principle and geometric characteristics of ejectors
1.1 Operating principle
Ejectors are static devices used to suck in, compress or mix gases, vapors or liquids, thanks to the expansion of a driving (or primary) fluid. The primary fluid, which may be gaseous (subsonic or supersonic) or liquid (incompressible), provides the energy required to drive the secondary fluid.
A conventional ejector, as shown in figure 1 The fan comprises a motor nozzle (or primary nozzle) and a suction nozzle (also known as a secondary nozzle or return nozzle). The latter comprises a constant-section intake chamber for mixing the two fluids, and a diffuser.
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Operating principle and geometric characteristics of ejectors
Theory of operation of the main types of ejectors
Bibliography
Standards and norms
- Pompes à vide à jet de vapeur. Mesurage des caractéristiques fonctionnelles. Partie 1 : mesurage du débit-volume. - ISO 1608-1 - 1993
- Pompes à vide à jet de vapeur. Mesurage des caractéristiques fonctionnelles. Partie 2 : mesurage de la pression critique de refoulement. - ISO 1608-2 - 1989
- Vacuum technology – Measurement rule for vapor-jet vacuum pumps and vapor-jet compressors – Engine fluid: steam. -...
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