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Centrifugal Compressors: A Strategy for Aerodynamic Design and Analysis
Ronald H. Aungier
Ronald H. Aungier
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ASME Press
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In Chapter 12, the flow in the blade-to-blade stream surfaces was analyzed with a linearized method, where the stream function is assumed to vary linearly with η. This assumption results in a substantial reduction in computation time to produce a very efficient quasi-three-dimensional flow analysis. This linearized method has also been recommended for a fast blade loading evaluation for the vaned diffuser and return system detailed design procedures of Chapters 9 and 10. Comparison of the linearized method with the more exact method in this chapter shown in Figs. 12-8 through 12-10 has shown that the linearized method yields excellent prediction accuracy. But it also shows that a more exact analysis yields slightly different results, particularly near the blade leading and trailing edges. Consequently, a more exact blade-to-blade flow analysis should be part of any modern aerodynamic design system to provide a final blade loading evaluation. If the design system is properly structured, this final blade-to-blade flow analysis will require almost no effort on the part of the designer. Any design or analysis method using the linearized method (i.e., Chapters 9, 10 and 12) will have all data required to run the more exact method. By enabling those analyses to create the input file for the more exact blade-to-blade flow analysis, the designer can easily process the final analysis without any input data preparation.

Definition of the Problem
The Stream Function Solution
The Gas Density Solution
Some Useful Features
Typical Results
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