What type of ignition system is used on gas turbine engines?

What is gas turbine ignition system?

Most aircraft engines rely on an electrical ignition system to create a spark, which in turn initiates or continues the engine’s combustion process. … The function of gas turbine ignition systems is to convert energy from some source to a high intensity electrical discharge (i.e., sparks).

Which two types of igniter are used on gas turbine engines?

There are two types of igniter plugs; the constricted air gap type commonly used on gas turbine engines and the shunted surface discharge type. As the name implies, the air gap type has a larger gap between the body of the igniter and the electrode.

What are the three main components of ignition system for gas turbine engine?

There are three components of a turbine engine ignition system: the exciter, the ignition lead, and the igniter. The exciter takes input current from the aircraft electrical system, steps up the voltage, and delivers a high voltage output signal through the ignition lead to the igniter.

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What are the two types of igniter plugs?

There are two basic types of igniter plug; the constricted or constrained air gap type and the shunted surface discharge type. The air gap type is similar in operation to the conventional reciprocating engine spark plug, but has a larger air gap between the electrode and body for the spark to cross.

Where is the highest heat to metal contact in a gas turbine engine?

The turbine inlet nozzle vanes are located directly aft of the combustion chambers and immediately forward of the turbine wheel. This is the highest or hottest temperature that comes in contact with metal components in the engine.

What is an igniter plug?

An igniter plug for a turbine engine capable of operating at high temperatures without failure of internal insulators that separate the main electrode from the ground electrode.

What are the two types of combustion starters are used to start an engine?

Combustion starters

  • AVPIN starter.
  • Cartridge starter.
  • Fuel/air turbine starter (APU)
  • Internal combustion engine starter.

What is the main difference between a reciprocating and gas turbine engine ignition system?

A: Piston, or reciprocating engines convert pressure into rotating motion using pistons, while a gas turbine engine, or a combustion turbine, uses the pressure from the exploding fuel to turn a turbine and produce thrust.

How are turbine engine igniters operationally checked?

The igniter can be checked by listening for a snapping noise as the engine begins to turn, driven by the starter. The igniter can also be checked by removing it and activating the start cycle, noting the spark across the igniter.

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What is the purpose of an exciter unit?

The main purpose of exciter in a generator(alternator) is to provide stationary rotating magnetic field. Which is used to induce the e.m.f in the armature coil. So, DC power is given to exciter and the exciter is nothing but a coil, and the exciter creates a magnetic field.

Why does a gas turbine ignition system normally operate only during starting of the engine?

Turbine engines use continuous combustion and require an electrical spark only during the start sequence to ignite the fuel-air mixture. … They need to produce a spark intense enough to vaporize and ignite the fuel (Jet Fuel – kerosine, harder to ignite compared to AVGAS).

How are most radial engine spark plug wires connected to the distributor block?

How are most radial engine spark plug wires connected to the distributor block? By use of cable-piercing screws. … the construction is such that the spark occurs beyond the face of the combustion chamber liner.