Blade Cooling Methods in Gas Turbines

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.