Abstract
A study of the design of injectors or ejectors as used in the gas industry has led to the identification of three principal methods of entrainment of the induced gas by the driving gas. The performances of injectors using these methods have been compared both theoretically and experimentally using the criterion of pressure efficiency. From the results obtained it was found that in practice the highest pressure efficiencies were obtained by jet entrainment injectors. This method of injection was used in an examination of the consistency of the injection ratio over the operating range with respect to variations in gas supply, governor and downstream pressures and changes in specific gravity and discharge losses.
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