We can assume to first approximation that while the fluid flow is incompressible, the sound waves are not, but they are isentropic.
32.
Numbers in brackets indicate the order of energy or loss corresponding to 100 units of isentropic work ( h 01 h 03ss ).
33.
For a real gas, the isentropic chain is unusable and a " Mollier diagram " would be used instead for manual calculation.
34.
For an isentropic flow of a perfect gas, several relations can be derived to define the pressure, density and temperature along a streamline.
35.
If the process is furthermore internally reversible ( smooth, slow and frictionless, to the ideal limit ) then it will additionally be isentropic.
36.
This is the ratio of the blade velocity and the isentropic gas velocity that would be obtained in its isentropic expansion through the stage pressure ratio.
37.
This is the ratio of the blade velocity and the isentropic gas velocity that would be obtained in its isentropic expansion through the stage pressure ratio.
38.
An adiabatic and reversible running state change is isentropic ( entropy " S " remains the same as temperature " T " changes ).
39.
A process is said to be " physically reversible " if it results in no increase in physical entropy; it is " isentropic ".
40.
This fact is used in isentropic analysis, a form of synoptic analysis which allows visualization of air motions and in particular analysis of large-scale vertical motion.
