stagnation enthalpy

Since the total amount of energy within the system is constant, the stagnation enthalpy remains constant over both regions.

Calculating the change in specific stagnation enthalpy across disc:

Stagnation enthalpy () is the enthalpy of a flow at a stagnation point.

Stagnation enthalpy:

Computations which proceed in this way converge much more smoothly than those proceeding by way of stagnation enthalpy; and, in most cases they lead to identical results.

For many purposes in compressible flow, the stagnation enthalpy or stagnation temperature plays a role similar to the stagnation pressure in incompressible flow.

Total enthalpy is the same at every point in a flow field so the stagnation enthalpy at a stagnation point is identical to the total enthalpy everywhere in the flow field.

Convergence is sometimes difficult to achieve for high-Mach-number flows when, as has often been the practice in the past, the temperature has been deduced by subtracting the kinetic energy of the time-mean motion from the stagnation enthalpy.

However, invoking the common assumption of a calorically perfect gas, enthalpy can be converted directly into temperature as given above, which enables one to define a stagnation temperature in terms of the more fundamental property, stagnation enthalpy.

A rotation of blade row causes non-uniformity in radial velocity, stagnation pressure, stagnation enthalpy and stagnation temperature.It get distributed in both tangential direction and radial direction causes to generate secondary flow.

Stagnation enthalpy has units of energy, such that if enthalpy is thought of as the energy associated with the temperature plus the energy associated with the pressure, the stagnation enthalpy adds a term associated with the kinetic energy of the fluid mass.