Stagnation Conditions in the Tds Equations -- CFD Online Discussion Forums

November 29, 2023, 12:53	Stagnation Conditions in the Tds Equations	#1
David Scott New Member Join Date: Nov 2023 Posts: 2 Rep Power: 0	Is there a proof for why the stagnation conditions ( and ) may be used in the Tds equations? $\Delta S = c_P \ln \left( \frac{T_2}{T_1} \right) - R \ln \left( \frac{P_2}{P_1} \right)$ Denton 1993 states "the temperatures, pressures, and densities used in the Tds equations may be either all static values or all stagnation values because by definition the change from static to stagnation conditions is isentropic." Further, some sources justify this with "the Tds equations apply between any two thermodynamic end states". Are stagnation temperature and stagnation pressure thermodynamic state variables?

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