Why we don’t worry about the energy equation too much here

In low speed aerodynamics, density is usually assumed constant
(changes due to velocity changes are negligibly small).
Then you need one less equation because density is no longer an unknown variable.
Th th ti Thus the energy equation is rarely needed, except when one worries about what
happens when work is added to the flow, as by a propeller or rotor.
In such cases, we will relate the stagnation pressure to the stagnation enthalpy,
and use that instead as a measure of work added or removed.

 

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