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Constant expressions provide the user with a means to represent constant values with parameter identifier names. The modeler can define constants or constant expressions for an identifier that in turn can be used in any component model input field expression that is parsed during simulation. As an example, one could define a 'Scale' constant parameter that is multiplied with other values in expressions such as the inlet mass flow to represent different engine scales. With changing the scale in the constant expression component, the actual inlet mass flow will be scaled accordingly, which is convenient for scale effect studies.

 

It is advised to use a single constant expressions component per configuration/case and add multiple constants in the table. Constant expressions may use constants defined in prior table rows.

 

Note that it is easy to configure off-design and design modifiers and beware that changing a constant design expression requires a reset (new design calculation) of the model. Also beware that this will change the model (gas turbine) configuration.