GSP models > Model options > Thermodynamic options

The Thermodynamic model options window provides control over the following options:

Gas model

•Real gas effects map correction

When checked, the component map parameters are corrected for real gas effects (including variations of the gas constant R and gamma), when unchecked, correction is performed with temperature and pressure only.

Corrected or reduced parameters are often used for representation of component characteristics and overall engine performance. The off-design component maps often use corrected parameter groups to represent corrected mass flow and corrected or referred speed. Full correction (dimensionless) includes the diameter of the gas turbine and the gas properties. When a single gas turbine is considered, the diameter is not important. The gas properties are important when the real gas effects are considered since gamma is dependent on the temperature and R is dependent on the gas composition.

A derivation for the corrected spool speed and the corrected mass flow shows the difference between real gas corrections and ideal gas corrections:

•Corrected speed

•Corrected flow