Air compressor impeller types
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This post was last edited by Blindfolded on 2015-7-22 08:51. 3 high-efficiency impellers for compressors, of semi-open design with an outlet angle of 65°, made of stainless steel; 1 high-efficiency impeller for compressor, of closed design with an outlet angle of 50°, also made of stainless steel. Siemens’ 4-stage air compressor has 3 stages that are of semi-open type with an outlet angle of 65°, while the other stage is of closed type with an outlet angle of 50°. How can one determine which stage is the closed type? What is the purpose of such a design? @siemens001
The final stage should be a closed impeller
I agree with you, but why was it designed this way? What are the differences in the functions of open, semi-open, and closed types?
Semi-open impellers have a high flow rate, but their efficiency is lower than that of closed impellers; moreover, their leakage rate is also higher. As for the claim that the first three stages are all semi-open types, I’ve never seen that before. Could it be that you need a high flow rate but not necessarily very high pressure? Our man’s crew: one and a half levels open, three levels closed
This post was last edited by Blindfolded on 2015-7-23 at 15:48. Semi-open impellers have a higher flow rate, but their efficiency is lower than that of closed impellers; moreover, they exhibit greater leakage compared to closed impellers. As for your mention that the first three stages are all semi-open type, I’ve never seen that before. Could it be that you need a high flow rate but not necessarily very high pressure? Our unit is of the type with one and a half stages open and three stages closed. As you mentioned, the flow rate is 480 T/H and the pressure is 11 Barg. Does a high leakage rate mean low efficiency, or a low compression ratio? There are also a few other units, all of which have level 5 systems that are open-type; they have higher pressure and slightly lower flow rates. Could you provide the model of your MAN engine?
What does a flow rate of 480 T/H mean? Weren’t you talking about a compressor? It seems like it’s talking about pumps
Air compressor outlet flow is adjusted according to the plant load
You’re referring to mass flow rate; I’ve done the calculations and our flow rate is more or less the same. Usually we talk about volume flow rate, which is 357870 Nm3/h
Are you the crew of RG160?
No, we are RIKT140. Which company are you from?
A semi-open impeller is efficient at low pressure and high volumetric flow rates. When the pressure reaches a certain level, it is no longer applicable.