Centrifugal compressor
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What is the formula for calculating the surge point of a centrifugal compressor?
In simple terms, the vertical axis represents the pressure ratio, while the horizontal axis represents the inlet flow rate
I’m afraid there’s no formula that can be used to calculate this directly. The manufacturer will, based on the actual measurement data at the model level and using similarity theory, determine several surge points for the new machine (the flow rate or pressure ratio corresponding to different rotational speeds). You can use these values to develop an equation that can be used for operation or automatic control. Now, CFD technology is also available for simulation and prediction, with a certain degree of reliability.
Indeed, there is no universal formula that can be applied directly, as it involves various factors such as the logic, conditions, and flow compensation mechanisms for anti-surge control in each unit.