Day 8 Progress Check Flashcards
Cooling mechanisms in turbine engines are divided into zones separated by:
Fireproof bulkheads and seals
How is cooling primarily provided to the turbine disc in turbine engines?
HP stage air
What is the purpose of accessory zone cooling in turbine engines?
To maintain acceptable temperatures and prevent harmful vapors
What is the purpose of the sealing air system in turbine engines?
To seal bearings using pressurized air
How is a labyrinth seal rub detected in turbine engines?
Audibly or felt during hand turning
What is the purpose of insulating blankets in turbine engines?
To prevent contact between fuel or oil and hot engine parts
To decrease the temperature of combustion, the fuel-air mixture is augmented for cooling. Which of the following best describes what is changed?
Additional air is introduced
What is the goal of Clearance Control in turbine engines?
To maintain tight clearance between rotor blades and turbine housing
What is the primary purpose of labyrinth seals in turbine engines?
To eliminate contact-points- reducing wear
At what temperature range do gas turbine engines typically operate?
1,500° to 2,100°F
How are rotors and stators typically cooled in turbine engines?
Double pass cooling
Single pass cooling
Film cooling
Correct: All of the above
Which type of seal is designed to wear-in, forming a close tolerance fitting on hot components?
Abradable seal
Why is cooling essential in internal combustion engines?
To prevent overheating and maintain optimal performance
What is the composition of insulating blankets?
Fiberglass and metal foil
What is the primary purpose of film cooling in turbine engines?
To insulate blades from hot gases
