The two gases of the turbine in a centrifugal compressor
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(1) I have studied turbine theory for a long time, but I am still not very clear about the relationship between the sealed steam and the suction medium in the shaft seal extractor (2) There is a steam pipeline on the turbine casing that runs from after the first stage of the impeller to the fourth stage. The reason for designing such a pipeline, according to the book, is to allow steam to reach the fourth stage for doing work. Why do some of the same turbines have it while others don’t? I have two questions regarding the above.
The medium drawn in by that shaft seal extractor is the leakage air from the cylinder’s shaft seal and the leakage steam. How do they communicate with each other? It is the steam turbine of the steam-driven centrifugal compressor, which has 6 stages; there is such a pipeline on its casing.