## 8.9. Using Vista RTD to Model an Existing Turbine

Vista RTD can be of use in the analysis of turbine test data – or operating point data from some other source. A 1D model of a selected operating point can 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, expansion ratio, and rotational speed (corrected for measured inlet temperature and pressure) are all known. By running the code in an iterative mode, the ‘unknowns’ (for example blade speed ratio) can be gradually adjusted until geometric parameters (such as impeller tip diameter, tip width, and so on) all attain their actual known values.

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