Factors affecting the outlet pressure of centrifugal compressors
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A storage tank is connected behind the centrifugal compressor; the compressor is used to fill the tank with air and increase its pressure, raising it from atmospheric pressure to 1.6 MPa. The rated discharge pressure of the compressor is 1.6 MPa. At the beginning of inflation, the pressure inside the tank is low, for example 0.2 MPa; at this point, what is the pressure of the gas exiting the compressor outlet – 0.2 MPa or some other value? When the pressure rises to 1 MPa, is the pressure of the gas exiting the compressor outlet also 1 MPa? If this is the case, it indicates that the exhaust pressure of a centrifugal compressor is directly related to the back pressure. Generally, we assume that there is a one-to-one relationship between the exhaust pressure and flow rate of a centrifugal compressor (based on the performance curve), which is a bit confusing. I earnestly request discussions and answers from colleagues. Centrifugal compressors are the subject of discussion.
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The outlet pressure of a centrifugal compressor is the point where the compressor’s own performance curve intersects with the pipeline characteristic curve. You can consult relevant basic materials for more information. When the back pressure changes, the pipeline characteristic curve changes, while the compressor’s performance curve remains unchanged; as a result, their intersection point changes, and thus the operating pressure value also changes.
For this problem, you can ignore the storage tank and treat it as just a section of pipe in series with the compressor. Pressurization is the tank pressure achieved by gradually increasing the pressure source. And it needs to be controlled, which is achieved by regulating the compressor. If one wants to explain it from the performance curve, it also needs to be determined based on the actual control conditions. For reference.
Draw it roughly: when the back pressure is low, that is, when the pipeline characteristic curve is gentle, the intersection point with the compressor’s performance curve is at a lower position; under such conditions, the flow rate is high while the pressure is low. As the back pressure increases, the pipeline characteristic curve becomes steeper, and the intersection point with the compressor performance curve shifts upward; as a result, the compressor’s flow rate decreases while the exhaust pressure rises.
Thank you for the explanation; I see now that it’s actually the same as a centrifugal pump.