## 5.7. Notation

Abbreviation | Meaning
--- | ---
IGV | inlet guide vane
OGV | outlet guide vane
| adiabatic efficiency
P | total head rise
| relative angle
C | air absolute velocity
V | air relative velocity
U | blade tangential velocity
H | change in enthalpy
Superscripts
in | at the inlet to the blade row
out | at the outlet to the blade row
Subscripts
blade | with respect to the blade geometry
gas | with respect to the air flow
a | axial component
est | estimated value

Release 18.2 - © ANSYS, Inc. All rights reserved.