Flashcards in Axial Flow Turbines Deck (7)
What are 5 summary points of turbine blade design?
Turns flow away from engine axis
Flow area decreases (to a minimum at the throat)
Average velocity increases
Average pressure decreases
Extracts energy from the hot gases and drives the compressor
What is the flow accelerated by in the absolute frame?
What is the flow accelerated by in the relative frame?
In the absolute frame, where does the flow leave slower?
The flow leaves the rotor slower than it left the stator
What's the difference between an Impulse Turbine and a Reaction Turbine?
Impulse turbine - all pressure drop is in the nozzle effect on the blades is momentum only
Reaction turbines - pressure drop in both rotor and stator
What does the Stage Loading (Temperature Drop) coefficient do?
Defines how much work can be obtained from a stage - the higher the better, but usually at the cost of efficiency