Abstract
This chapter discusses the effect of a gas density change on dynamic compressor performance. The factors that define a given fluid are presented and we can readily observe that there are a significantly larger number of factors necessary to define a vapor because it is a compressible fluid. Referring to the fluid head equations for a liquid and a vapor, one can see that the pressure ratio developed for a gas is dependent on temperature, molecular weight, the specific heat ratio of the gases and compressibility. The effect of a gas composition or temperature change on turbo-compressor compression ratio is presented. The turbo-compressor impeller produced head changes slightly and also the curve shape will change as a result of the changing velocity relative to the blade. The pressure ratio produced by a dynamic compressor is affected by gas density. The effect of gas density changes on impeller produced head, surge point and choke point is analyzed. The effect on compressor section performance resulting from a change in the gas molecular weight is also elaborated.
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