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Conservation of rothalpy in the rotating components of turbomachinery is a fundamental assumption in low-order models, including meanline analysis. Commonly used equations of rothalpy depart from the actual values when a given surface in the rotational domain is not actually rotating, as is the case with an open impeller or in a leakage path.  In this webinar, we will look at the common equations for averaged rothalpy, determine under what circumstances they do not strictly apply, examine different correction methods, and consider a new formulation of leakage path modeling. The new formulation uses these corrected rothalpy terms, which provide a higher level of fidelity to loss generation and pressure distributions calculated from meanline models. This new formulation can provide improved prediction, particularly for axial thrust magnitudes, that have typically been difficult to calculate accurately.

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