蒸気エゼクタに関する研究(第2報)

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The flow in diffuser of the steam ejectors consists of the two processes, one of which is to mix steam with inhaled gas and the other is to transform the energy from the velocity of flow into the pressure. But in the theories of the steam ejectors, usually, the mixing process is. neglected, so that these theoretical methods are, as pointed out by Dr. Stodola, of little value for the ditermination of the dimensions in an actual case for the following reason : We do not know to what extent the velocities in a cross-section are equalized. Consequently, neither an exact energy equation nor a continuity equation can be formulated. So the author tried a calculation method of the flow in diffuser of the steam ejectors by thermodynamic consideration in which the two processes, not only the energy transformation process, but the mixing process, are considered. And he has made clear the various changes of flow state in diffuser and the causes of the so-called hysteresis phenomena of steam ejector. By this consideration, the two required conditions have been obtained for high vacuum in mixing chamber. (high vacuum characteristic) On the thermodynamic method, we meet with a difficulty, as also pointed out by Dr. Stodola, that the flows are of different kinds (steam and air). But this difficulty has been solved in this paper by drawing up i, s-diagrams for each air ratio, so that the various changes of flow state are shown on these diagrams.
一般社団法人日本機械学会の論文
1952-02-11

蒸気エゼクタに関する研究(第2報)

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