Gas Turbine Engine Components

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Questions and Answers

What is the primary function of the diffuser in the cold section of the 701D engine?

To compress air

To increase air temperature

To mix air and fuel

To reduce air velocity (correct)

How many stages are present in the compressor of the 701D engine?

Five axial stages

Six axial stages

Six axial stages and one centrifugal stage

Five axial stages and one centrifugal stage (correct)

What is the purpose of the engine's fifth stage bleed air?

To power the accessory gearbox

To generate electricity

To cool the turbine blades

To heat the swirl vanes, nose splitter, and engine (correct)

What is mounted on the power turbine module of the 701D engine?

The thermocouple harness, torque and overspeed sensor, and NP sensor Signup and view all the answers

What is the function of the variable inlet guide vanes in the compressor of the 701D engine?

To optimize air flow Signup and view all the answers

What is the purpose of the particle separator in the cold section of the 701D engine?

To separate air and particles Signup and view all the answers

What is the main purpose of the longitudinal support structure in the fuselage?

To support all major weight items Signup and view all the answers

Which section of the fuselage contains the pilot station and provides support for the main landing gear?

Center fuselage section Signup and view all the answers

What is mounted to the forward fuselage section?

The TADS, PNVS, and M230E1 AWS Signup and view all the answers

What is the purpose of the bulkheads in the fuselage?

To support all major weight items Signup and view all the answers

What is contained in the aft fuselage section?

The aft avionics bay and stowage compartments Signup and view all the answers

What is equipped with elastomeric lead-lag dampers?

The main rotor system Signup and view all the answers

What is the main component of the hot section module in the T700 GE 701D EDECU engine?

Gas generator turbine (NG) Signup and view all the answers

Which module is responsible for housing the ignition system in the T700 GE 701D EDECU engine?

Accessory section module Signup and view all the answers

What is the type of engines used in the helicopter?

Front drive turboshaft engines Signup and view all the answers

Which component is NOT mounted on the cold section module?

Power turbine section Signup and view all the answers

What is the location of the engine in the helicopter?

Aft of the main transmission Signup and view all the answers

What is the function of the Engine and Auxiliary Power Unit (APU) Fire Detection/Extinguishing System?

To detect and extinguish engine fires Signup and view all the answers

What is the function of the engine mounted nose gearboxes in the AH-64E Apache helicopter?

To drive the main transmission Signup and view all the answers

What is the purpose of the over-running clutches in the AH-64E Apache helicopter's engine system?

To allow the engine to freewheel during autorotation Signup and view all the answers

What type of engines power the AH-64E Apache helicopter?

Turboshaft engines Signup and view all the answers

What component is driven by the main transmission in the AH-64E Apache helicopter?

Main rotor and tail rotor Signup and view all the answers

What is the function of the shafts in the AH-64E Apache helicopter's engine system?

To transmit power from the engine to the main transmission Signup and view all the answers

What type of design is used for the tail rotor in the AH-64E Apache helicopter?

Semi-rigid design Signup and view all the answers

What is the purpose of the accessory gearbox in the AH-64E Apache helicopter?

To drive the aircraft's accessories Signup and view all the answers

Study Notes

Engine Architecture

The T700 GE 701D EDECU engine is a front drive turboshaft engine with a modular construction.
The engine is divided into four modules: cold section, hot section, power turbine section, and accessory section.

Cold Section

The cold section includes the main frame, diffuser and mid frame assembly, inlet particle separator, compressor, output shaft assembly, and associated components.
The compressor has five axial stages and one centrifugal stage.
There are variable inlet guide vanes and variable stage 1 and 2 stator vanes.

Hot Section

The hot section module consists of three subassemblies: the gas generator turbine (NG), stage 1 nozzle assembly, and annular combustion liner.

Power Turbine Section

The power turbine module includes a two-stage power turbine (NP) and exhaust frame.
Mounted on the power turbine module are the thermocouple harness, the torque and overspeed sensor, and the NP sensor.

Accessory Section

The accessory section module includes the top-mounted accessory gearbox.
Components mounted on the cold section module include the Enhanced Digital Electronic Control Unit (EDECU), history recorder/history counter, ignition system, and electrical cables.

Fuselage

The fuselage includes a forward, center, and aft section.
The forward fuselage section contains a portion of the Extended Forward Avionics Bays (EFAB), and the CPG station.
The center fuselage contains a portion of the EFAB, the pilot station, and provides support for the main landing gear, main transmission, wings, fuel cells, and ammunition bay.
The aft fuselage section includes the vertical stabilizer and mounts the tail landing gear.

Rotors

The helicopter has a fully articulated four-blade main rotor system equipped with elastomeric lead-lag dampers.
The tail rotor is a semi-rigid design and consists of four blades.

Engines and Power Transmission

The helicopter is powered by two turboshaft engines.
Power is supplied to the main transmission through engine-mounted nose gearboxes, shafts, and over-running clutches.
The main transmission drives the main and tail rotors and accessory gearbox.

Wings

Left and right wings are attached to the center fuselage.
Each wing provides two hard points for external stores pylons with hydraulic and electrical quick-disconnects.
Wing tip pylons are installed on the outboard portion of each wing for mounting the ATA launchers.

Special Mission Kits

The helicopter can be equipped with various kits, including Longbow Fire Control Radar (FCR), Winterization, Extended Range Fuel System, Air to Air to Ground (AAG), Link 16, and Upper Receiver (UR).

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Description

This quiz covers the different components of a gas turbine engine, including the stage 1 nozzle assembly, compressor, power turbine section, and more.