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Centrifugal compressor
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====Volume flow per unit time==== In contrast, all volume flow specifications require the additional specification of density. Bernoulli's fluid dynamic principle is of great value in understanding this problem. Confusion arises through either inaccuracies or misuse of pressure, temperature, and gas constants. Also as is standard practice, Figure 5.2 has a vertical axis labeled with a pressure parameter. There is a variety of pressure measurement units. They all fit one of two categories: * ''A △pressure, ie increase from inlet to exit'' (measured with a manometer) * ''A discharge pressure'' The pressure rise may alternatively be specified as a ratio that has no units: * ''A pressure ratio'' (exit/inlet) Other features common to performance maps are:
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