Non-ideal Effects in Compressible Swirling Flows
F. Tosto (TU Delft - Flight Performance and Propulsion)
A. Giuffré (TU Delft - Flight Performance and Propulsion)
P. Colonna (TU Delft - Flight Performance and Propulsion)
Matteo Pini (TU Delft - Flight Performance and Propulsion)
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Abstract
In this work we examine the behavior of non-ideal compressible swirling flows. Based on a first-principle analysis, we derive a generalized expression of the corrected flow per unit area as function of the isentropic exponent, characteristic Mach numbers, and swirl parameter. The calculated trends of the corrected flow with respect to these parameters, validated against results from high-fidelity computations, are used to infer physical insights on the behavior of swirling flows in turbomachinery cascades. The results suggest that fluid flows characterized by low values of the isentropic exponent show swirling behaviors that are substantially different than those exhibited by perfect gases. Ultimately, this can make the design of efficient turbomachines operating close to the critical point particularly challenging.