The ambient/flight conditions window provides control over the gas turbines ambient operating conditions, which affect model performance through components such as the Inlet and Exhaust components.

Flight or ambient conditions can be specified according to three different atmospheric models.

The ambient/flight conditions window contains the following tabs:

•Design conditions

Reference design flight or ambient conditions are specified here for which the engine is designed.

•Off-design flight/ambient conditions

Steady state off-design flight or ambient conditions are specified here.

•Transient or St.St. OD Series

Off-design steady state series or transient flight or ambient conditions as a function of time are specified here in a transient input grid. To input or change variable data at a time step consistent with the selected atmospheric model, editing is not performed in the grid but in a seperate specification window, which pops up after double-clicking one of the variables or by clicking the Edit button. After having edited variable data, click the Apply button to recalculate all variable data for the time step.

Note: GSP can not interpolate values between different atmospheric types; therefore, be sure to use the same atmospheric type (i.e. ISA, ISA+ or Custom) for all transient input points or your transient simulation will not work (values will remain constant).

•Output

Use this tab to select the output parameters to populate the output tables. Note that there are options that output the static atmosphere data (see the Static conditions data options group), other groups of options output the flight conditions or total parameters (Total conditions data and the Air speed data). The last group of options (Gas/Air composition) output composition property data parameters.

•Humidity

Design and off-design ambient humidity can be specified as a mass percentage of the total flow (Mass %), as a volumetric percentage of the total flow valid for the vapour only (Vol %), or as relative humidity (Relative humidity %). The liquid water mass percentage (Mass % liquid water) is determined in the calculation.

AmbFlightCond