Flashcards on Gas Turbine Engine Fundamentals
Gas Turbine Engine Fundamentals: Components & Types Explained
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Aircraft Gas Turbine Engines
20 cards
Card 1
Question: What are the major components of a typical gas turbine engine?
Answer: Air inlet, compression section, combustion section, turbine section, exhaust section, and accessory section.
Card 2
Question: Why should a turbojet be allowed to cool before shutdown after high-power operation?
Answer: To prevent the shroud contracting around the turbine wheel and seizing the rotor.
Card 3
Question: What is a hung start in a turbine engine?
Answer: Ignition occurs but the engine does not accelerate to a self-sustaining speed.
Card 4
Question: What is a hot start in a turbine engine?
Answer: Ignition occurs and internal temperatures rise high enough to potentially damage the engine.
Card 5
Question: What is meant by trimming a turbojet engine?
Answer: Adjusting the fuel control to achieve the correct idling and maximum-thrust RPM.
Card 6
Question: What may indicate a turbojet engine is out of trim?
Answer: A high exhaust gas temperature (EGT) at target engine pressure ratio (EPR) for takeoff.
Card 7
Question: What is the function of compressor stators in an axial-flow compressor?
Answer: They convert some velocity energy into pressure energy and change the air direction for the next rotor stage.
Card 8
Question: Where is the diffuser section located and what does it do?
Answer: Between the compressor section and the burner cans; it converts high-velocity compressor discharge air into static pressure.
Card 9
Question: What is meant by creep of turbine blades and what causes it?
Answer: Permanent elongation of turbine blades caused by high temperatures and high centrifugal loading.
Card 10
Question: How are compressor blades attached to a disk-type rotor?
Answer: Fitted with bulb-type or fir-tree roots and locked by screws, peening, locking wires, pins, or keys.