Please talk about the performance curve of centrifugal compressors
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1. Could everyone please explain the performance curve of centrifugal compressors, and the issues related to the upward or downward movement of this curve? 2. What does the outlet pressure of a centrifugal compressor depend on? What is the relationship between pressure and speed?
Your question is a bit broad; I’ll try to answer it partially. 1. The performance curve of a centrifugal compressor is a flow-pressure curve; it shifts upward as the rotation speed increases and downward as the rotation speed decreases. It also shifts upward when the molecular weight of the medium increases. 2 According to the performance curve, the outlet pressure is related to both the rotational speed and the pressure in the outlet system. When the outlet pressure remains constant, changes in rotational speed affect the flow rate; whereas when the rotational speed is constant, changes in outlet pressure affect the flow rate.