Blade Cooling Quiz and Flashcards: Gas Turbine Methods

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Questions and Answers

What is the purpose of convection cooling/film cooling in blade cooling?

To direct compressor bleed air through holes in the blade (correct)

To dampen gyroscopic effects

To reduce engine vibration

To direct bleed air into the vanes

Which type of cooling is specifically used on stationary nozzle vanes?

Counter Rotating Turbines cooling

Exhaust cone cooling

Convection cooling/film cooling

Transpiration cooling (correct)

Why are Counter Rotating Turbines chosen by engine designers?

For exhaust cone assembly

To reduce turbine discharge gases

For aerodynamic reasons

To reduce engine vibration (correct)

What is the purpose of a typical exhaust section in a gas turbine engine?

To safely direct exhaust gases from the exhaust cone to the nozzle Signup and view all the answers

What is the main component of an exhaust cone assembly?

Inner cone Signup and view all the answers

What is the function of a tailpipe in a gas turbine engine?

Channel exhaust gases to the exhaust nozzle Signup and view all the answers

What are the two main sections of a gas turbine engine?

Compressor and turbine Signup and view all the answers

Which section of a gas turbine engine does the air inlet belong to?

Compressor Signup and view all the answers

What is the function of the air inlet of a gas turbine engine?

Recover as much total pressure of the free airstream as possible Signup and view all the answers

Which part of the gas turbine engine is designed to provide a relatively turbulent-free supply of air to the low-pressure compressor?

Air inlet Signup and view all the answers

Where is the air inlet typically built in a gas turbine engine installation?

In the forward part of the nacelle installation Signup and view all the answers

Which section of a gas turbine engine includes the combustion, turbine, and exhaust components?

Hot section Signup and view all the answers

What is the main objective of the Compressor Section in a gas turbine engine?

To supply compressed air for combustion Signup and view all the answers

What does the Compressor Pressure Ratio represent in a gas turbine engine?

Outlet pressure divided by inlet pressure Signup and view all the answers

What are some functions of the Compressor Section in a gas turbine engine?

To supply bleed air for various purposes Signup and view all the answers

How does bleeding air from the compressor affect engine power?

Causes a noticeable drop in engine power Signup and view all the answers

Which of the following is NOT a current application of bleed air in a gas turbine engine?

Powering the exhaust section Signup and view all the answers

What factors determine the amount of air passing through a gas turbine engine?

The compressor speed (rpm), forward speed of the aircraft, and density of the ambient air Signup and view all the answers

Study Notes

Cooling Systems

Convection cooling/film cooling is used to cool blades in a gas turbine engine.
Stationary nozzle vanes use film cooling specifically.

Turbine Design

Counter Rotating Turbines are chosen by engine designers to improve engine performance.
The purpose of an exhaust section in a gas turbine engine is to expand the hot gases and convert the thermal energy into kinetic energy.
The main component of an exhaust cone assembly is the exhaust cone.
The function of a tailpipe in a gas turbine engine is to collect the exhaust gases and direct them out of the engine.

Engine Components

The two main sections of a gas turbine engine are the Air Inlet Section and the Core Engine Section.
The air inlet belongs to the Air Inlet Section.
The function of the air inlet is to provide a relatively turbulent-free supply of air to the low-pressure compressor.
The air inlet is typically built in the inlet guide vanes of a gas turbine engine installation.
The Core Engine Section includes the combustion, turbine, and exhaust components.

Compressor Section

The main objective of the Compressor Section is to compress air and supply it to the combustion chamber.
The Compressor Pressure Ratio represents the ratio of the compressor outlet pressure to the inlet pressure.
The Compressor Section functions include compressing air, providing bleed air, and providing a relatively turbulent-free supply of air to the combustion chamber.
Bleeding air from the compressor reduces engine power by reducing the mass flow of air to the combustion chamber.
Current applications of bleed air in a gas turbine engine include anti-icing, air conditioning, and pressurization systems.

Engine Performance

The amount of air passing through a gas turbine engine is determined by factors such as throttle setting, engine speed, and compressor performance.

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Description

Explore the two main types of blade cooling methods used in gas turbines: convection cooling/film cooling and transpiration cooling. Learn how compressor bleed air and porous materials are used to cool turbine blades effectively.