## 6.10. Using Vista CCD to Model an Existing Compressor

Vista CCD can be of use in the analysis of compressor test data – or operating point data from some other source. A 1D model of a selected operating point may be created by synthesizing the known geometry and test data.

In the Geometry section of the data, all items will be known and fixed. From the test data, the mass flow, pressure ratio, work factor, rotational speed (corrected for measured inlet temperature and pressure) are all known. By running the program in an iterative mode, the ‘unknowns’ (relative velocity ratio, incidence, and possibly lambda and choke margin) may be gradually adjusted until parameters such as impeller tip diameter, tip width, inlet vane angles, and so on, all attain their actual known values. Effective backsweep may also have to be adjusted to obtain the known work factor or pressure ratio.

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