NGV cooling
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•Bleed flow nr
The compressor bleed flow number providing the cooling flow. This number must represent an existing compressor bleed flow, defined in a compressor component.
•Frac. for cool.
The fraction of the compressor bleed flow used for this turbine cooling flow.
•Frac. Eff. T.flow
The fraction of the cooling flow that contributes to the turbine effective flow. A larger or smaller part of the flow can be added to the flow obtained from the flow - pressure ratio relation in the map. A fraction of 1 means all cooling flow requires a proportional share of the cross flow area, at the cost of the turbine entry flow (e.g. the main flow exiting the combustor) so that for the same pressure ratio the entry flow is smaller. This would be the case if all cooling flow enters the turbine at the entry. If all cooling flow would enter at the exit, the fraction should be set to 0. Usually this fraction value is set between 0 and 1 and used to accurately fine-tune the model to known engine data.