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Questions and Answers
The converging portion of the exhaust nozzle accelerates the turbine exhaust gases to subsonic speed at the narrowest part of the duct.
The converging portion of the exhaust nozzle accelerates the turbine exhaust gases to subsonic speed at the narrowest part of the duct.
False
The diverging portion of the exhaust nozzle further accelerates the exhaust gases to above the speed of sound.
The diverging portion of the exhaust nozzle further accelerates the exhaust gases to above the speed of sound.
True
The accessory drive of a gas turbine engine powers only the engine accessories, not the aircraft accessories.
The accessory drive of a gas turbine engine powers only the engine accessories, not the aircraft accessories.
False
The accessory section of a gas turbine engine also acts as a sump for oil storage.
The accessory section of a gas turbine engine also acts as a sump for oil storage.
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The converging-diverging duct design in an exhaust nozzle always increases in diameter from front to back.
The converging-diverging duct design in an exhaust nozzle always increases in diameter from front to back.
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The power needed to drive the accessories in a gas turbine engine is typically taken from a separate power shaft, not the main engine's power shaft.
The power needed to drive the accessories in a gas turbine engine is typically taken from a separate power shaft, not the main engine's power shaft.
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The exhaust cone assembly consists of an outer duct, inner cone, radial solid struts, and tie rods.
The exhaust cone assembly consists of an outer duct, inner cone, radial solid struts, and tie rods.
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A tail pipe is an extension of the exhaust section that directs exhaust gases from the exhaust cone to the accessory drive.
A tail pipe is an extension of the exhaust section that directs exhaust gases from the exhaust cone to the accessory drive.
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Tail pipes are used exclusively with engines installed in a nacelle or pod.
Tail pipes are used exclusively with engines installed in a nacelle or pod.
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An exhaust nozzle provides exhaust gases with a boost in velocity.
An exhaust nozzle provides exhaust gases with a boost in velocity.
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Converging and converging-diverging are two types of exhaust nozzle designs used on aircraft.
Converging and converging-diverging are two types of exhaust nozzle designs used on aircraft.
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On a converging exhaust nozzle, the nozzle diameter increases from front to back.
On a converging exhaust nozzle, the nozzle diameter increases from front to back.
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The turbine in a turbojet engine absorbs approximately 60 to 80% of the total pressure energy from the exhaust gases.
The turbine in a turbojet engine absorbs approximately 60 to 80% of the total pressure energy from the exhaust gases.
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The turbine section of a turbojet engine is located upstream of the combustion section.
The turbine section of a turbojet engine is located upstream of the combustion section.
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A typical turbine casing has flanges on both ends for attaching the turbine section to the exhaust assembly.
A typical turbine casing has flanges on both ends for attaching the turbine section to the exhaust assembly.
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The turbine nozzle in a gas turbine engine is typically exposed to the lowest temperatures.
The turbine nozzle in a gas turbine engine is typically exposed to the lowest temperatures.
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The turbine stator element is most commonly referred to as the turbine inlet nozzle.
The turbine stator element is most commonly referred to as the turbine inlet nozzle.
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The turbine extracts energy from the hot gases and expands them to a higher pressure and temperature.
The turbine extracts energy from the hot gases and expands them to a higher pressure and temperature.
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Study Notes
Exhaust Nozzle Design
- Converging portion accelerates turbine exhaust gases to subsonic speeds at the narrowest duct area.
- Diverging portion further accelerates gases beyond the speed of sound.
- Converging-diverging duct design ensures a continual increase in diameter from front to back.
Engine Accessories and Power
- Accessory drive of a gas turbine engine solely powers engine accessories, not aircraft accessories.
- Accessory section serves as an oil storage sump for the engine.
- Power to drive accessories is sourced from a separate power shaft, distinct from the main engine's power shaft.
Exhaust Cone Assembly
- Composed of an outer duct, inner cone, radial solid struts, and tie rods.
- Tail pipe acts as an extension directing exhaust gases from the exhaust cone to the accessory drive.
- Tail pipes are utilized exclusively in engines housed within a nacelle or pod.
Performance Characteristics
- Exhaust nozzles boost the velocity of exhaust gases.
- Types of exhaust nozzle designs include converging and converging-diverging configurations.
- The turbine in a turbojet engine captures approximately 60 to 80% of total pressure energy from exhaust gases.
Turbine Section Insights
- Located upstream of the combustion section, crucial for energy extraction.
- Typical turbine casing features flanges on both ends for assembly connections.
- Turbine nozzle experiences the lowest temperatures within the gas turbine engine.
- Turbine inlet nozzle is the common term for the turbine stator element.
Energy Extraction
- Turbine expands hot gases to achieve higher pressure and temperature, efficiently utilizing energy output.
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Description
Test your knowledge on the design of exhaust nozzles in aerospace engineering. Learn about how a convergent-divergent duct accelerates exhaust gases to increase engine thrust.
