How does a gas turbine engine start?

Gas turbine engines come in many shapes and sizes. … The electric motor spins the main shaft until there is enough air blowing through the compressor and the combustion chamber to light the engine. Fuel starts flowing and an igniter similar to a spark plug ignites the fuel.

What is the proper starting sequence for a gas turbine engine?

The normal starting sequence is: Rotate the compressor with the starter; Turn the ignition on; and. Open the engine fuel valve, either by moving the throttle to idle or by moving a fuel shutoff lever or turning a switch.

What is the use of re heater in a gas turbine?

— Reheater is a part of the boiler which to reheat steam output from the first level of the steam turbine. Reheated steam will again absorb the heat energy from the boiler to be used in the next level steam turbine. Reheater is one way to improve the thermal efficiency of the Rankine Cycle.

Why do you start engine 2 first?

The isolation valve in Open or Auto ensures that the Auxiliary Power Unit (APU) bleed air reaches the engine number 2 starter. Engine number 2 start Exhaust Gas Temperatures (EGT) are generally higher. Engine number 2 is started first because it’s on the opposite side of the air bridge.

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What types of gas turbine engines would typically use an electric starter?

Electric starting systems for gas turbine aircraft are of two general types: direct cranking electrical systems and starter generator systems. Direct cranking electric starting systems are used mostly on small turbine engines, such as Auxiliary Power Units (APUs), and some small turboshaft engines.

Do airplanes have ignition keys?

Small planes (like the little Cessna in How Airplanes Work) have locks on the doors and ignition keys inside to start the engine. … Commercial jets, on the other hand, have no locks on the doors and no ignition key of any sort. You can hop in, flip a couple of switches and start one up!

What is a hot start turbine?

A “hot start” in any variant of a jet engine refers to the circumstance where the manufacturer defined limiting temperature for start has been exceeded. … The most common reasons for a hot start include insufficient airflow through the compressor, incorrect fuel scheduling and slow engine acceleration.

How long does a gas turbine take to start?

While combined cycle gas turbines can take over 30 minutes to start, combustion engine power plants can start and reach full load in less than 5 minutes – providing flexible, quick-start capability.

How long do gas turbines last?

One final difference is that a gas turbine has more like a 20 year life time, whereas a thermal power plant has a 50 year lifetime. Gas turbines can be combined with standard thermal plants often use what is called a combined cycle format.

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