Examples of critical flight modes that use continuous ignition are takeoff, landing, and some abnormal and emergency situations. Most gas turbine engines are equipped with a high-energy, capacitor-type ignition system and are air cooled by fan airflow.
What is continuous ignition?
In a jet engine, the term “continuous ignition” refers to both automatic and pilot selectable activation of the ignition system in circumstances other than during the start cycle. … Once the engine is started, combustion is self sustaining so long as fuel is supplied and the airflow is not interrupted.
How does a gas turbine ignition system work?
Turbine Ignition Systems Overview
The exciter uses input power from an airframe electrical bus or an engine-mounted generator to convert relatively low voltage to more useable, high-voltage energy pulses that fire an igniter plug and in turn ignite the fuel/air mixture.
What causes ignition in a jet engine?
Air reaches the front intake in the basic jet engine, and is compressed. Then the air is pushed into the combustion chambers, where it is sprayed with gasoline, and the air and fuel mixture is ignited. Gases that form quickly expand and through the rear of the combustion chambers are exhausted.
What are turbine engine ignition systems rated in?
What are turbine engine ignition systems rated in? Joules (watt-seconds). Why are igniters needed? They need to produce a spark intense enough to vaporize and ignite the fuel (Jet Fuel – kerosine, harder to ignite compared to AVGAS).
What is the function of the turbine section used in a turbine engine?
The turbine section of the gas turbine engine has the task of producing usable output shaft power to drive the propeller. In addition, it must also provide power to drive the compressor and all engine accessories.
What are the types of aircraft ignition system?
Moreover, the aircraft ignition system has two types, electronic ignition system, and a magneto ignition system. Previously, an electronic ignition system for responding to airplane engines, especially in test airplanes, has been formed into the bolt-on and off-the-shelf items.
How does the ignition system of a gas turbine engine differ from that of a reciprocating engine?
How does the ignition system of a gas turbine engine differ from that of a reciprocating engine? A high-energy spark is required for ignition. … the stored energy in the ignition shielded lead unloading after normal timed ignition.
How do you maintain and inspect the turbine engine ignition system?
Maintenance of the typical turbine engine ignition system consists primarily of inspection, test, troubleshooting, removal, and installation. Inspection of the ignition system normally includes the following: Ignition lead terminal inspection; ceramic terminal should be free of arcing, carbon tracking and cracks.
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.
Do turbine engines use spark plugs?
Are gas turbine engines ignited with spark plugs? – Quora. Yes.. gas turbines have retractable type spark plug installed in two or three combustion cans. (for example – on GE 9FA gas turbine , out of 18 combustion chambers, two will have Spark plug installed on them).
What is ignition exciter?
Ignition Exciter System (IES) convert electrical energy at low voltage levels into high intensity sparks capable of firing an air fuel mixture in gas turbines. Generally, electronic switches are in series with the energy discharge path of the spark current.
How long can a jet engine run continuously?
In the case of slight modifications to the engine lubrication system, most aircraft turbine engines can run for over 20,000 hours of continuous operation at a reduced power level. When a turbine engine has been shut down, it usually needs to cool down before restarting, depending on the power level.
What is the most common type of spark igniter used on a gas turbine engine?
One disadvantage of this method is that fuel may auto-ignite or otherwise combust before the fuel-air mixture reaches the combustion zone. If this happens the combustor can be seriously damaged. Most igniters in gas turbine applications are electrical spark igniters, similar to automotive spark plugs.
How does the turbine engine aircraft starter work?
The starter is operated by introducing air of sufficient volume and pressure into the starter inlet. The air passes into the starter turbine housing where it is directed against the rotor blades by the nozzle vanes causing the turbine rotor to turn. … This closes the valve and shuts off the air supply to the starter.
What are some of the sources used to heat the fuel in a turbine engine fuel system?
What are some of the sources used to heat the fuel in a turbine engine fuel system? Bleed air and engine lubricating oil. What are the most common types of fuel metering systems used on small reciprocating engines? Float-type carburetors, pressure-injection carburetors and direct fuel injection systems.