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Stagnation enthalpy of a fluid at one point is the enthalpy of the fluid at that point at a stagnation point. It represents the enthalpy of a fluid when it is brought to rest from velocity V {\displaystyle V} isentropically. When the potential energy of the fluid is negligible, the stagnation enthalpy represents the total energy of a flowing fluid stream per unit mass.
Stagnation enthalpy is the sum of the enthalpy associated with the temperature at each point plus the enthalpy associated with the dynamic pressure at each point.
h 0 = h + V 2 2 {\displaystyle h_{0}=h+{\frac {V^{2}}{2}}}
where h {\displaystyle h} is enthalpy, and V {\displaystyle V} is velocity. Suffix ‘0’ denotes stagnation condition.