Turbine Block 13 Practice Exam

In turbine engine terminology, Pt7 denotes which quantity?

Total Pressure at station No. 7 Total Temperature at station No. 7 Static Pressure at station No. 7 Total Pressure at nozzle exit

Correct Answer:

Total Pressure at station No. 7

Explanation:

The main idea is that Pt7 is the stagnation (total) pressure at a specific location in the engine, labeled as station seven. In turbomachinery notation, P stands for pressure and the subscript t indicates total (as opposed to static) pressure, which includes the dynamic pressure due to flow velocity. The number seven merely points to the exact station along the flow path where this pressure is defined. So Pt7 is the total pressure at that station. This is distinct from total temperature (which would be Tt7) or static pressure (which would be P without the t), and it isn’t referring to the nozzle exit pressure.

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