Everyone, please help take a look at the surge line curve
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http://down.hcbbs.com/attachment/forum/201203/15/124255ds28ps6do2277td2.jpg As shown in the figure above, the vertical axis represents the ratio of outlet pressure to inlet pressure; what does the horizontal axis HC represent? I looked up a lot of information. Some say it’s a percentage of traffic. It is also said to be the ratio of the inlet pressure difference to the inlet pressure, that is, h/ps. Which of these two statements is correct?
The pressure ratio is defined as: absolute outlet pressure divided by absolute inlet pressure. HC: head compensated for suction pressure (Hc%). The Hc operating point is calculated using a functional formula that takes flow rate, pressure, and temperature into account.
Is it the same as h/ps? According to the information provided, the horizontal axis is usually the pressure difference h or h/ps; is this HC another way of representing it?
Different compressors have various anti-surge control schemes, and the axes used may also vary. The horizontal axis represents a parameter related to flow rate; some systems use the flow rate differential directly, while others use the ratio of pressure differentials. The maximum value on the horizontal axis in the graph is 100, which is likely to represent the ratio of pressure differentials. It is recommended that you use the performance curve provided by the compressor manufacturer for judgment.
Different compressors have different anti-surge control schemes, and the horizontal and vertical axes may also vary, as there is no uniform standard. Generally, the horizontal axis represents a parameter related to flow rate; some use the flow pressure difference directly, while others use the ratio of pressure differences, etc. The maximum value on the horizontal axis in the graph is 100, which is likely the ratio of pressure differences. It is recommended that you use the performance curve provided by the compressor manufacturer for judgment.
Typical value: inlet throat differential pressure/inlet pressure~~i.e., h/Ps~~
The x-axis? Is it proportional to traffic? Seeking advice
Yes~~it is proportional to the flow rate~~the pressure difference at the throat essentially represents the inlet flow rate, while Ps generally does not change much~~
For specific details, you can check the accompanying materials for the compressor; those materials contain detailed instructions. There are also formulas for calculating HC.