How does a jet engine get oxygen at high altitude?

Jet engines compress the air internally, making it much thicker and providing adequate oxygen for combustion.

How does a jet engine work at high altitude?

Jet engines work more efficiently at high altitude because the air is cooler. … Hence, the larger the expansion of the air when heated, the faster the aircraft moves because it is the expansion of air that drives the turbines of the jet engine which generates more power for lesser fuel burn.

Why do jet engines work better at high altitudes?

Jet Engine Efficiency

The specific fuel consumption of jet engines decreases as the outside air temperature decreases for constant engine rpm and true airspeed (TAS). Thus, by flying at a high altitude, the pilot is able to operate at flight levels where fuel economy is best and with the most advantageous cruise speed.

How does a jet engine run without oxygen?

There is little oxygen, but there is equally less of all other gasses. The airplane’s gas turbine engines resolve this by compressing the intake air significantly with the compressor stage. Then the fuel is added, combusted, and the power is extracted by the turbine stages.

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How long do jet engines last?

Older and smaller jet engines typically have TBOs of 5,000 hours at the most. More modern engines have about 6,000 hours or more. With most business jets accumulating less than 500 hours of flying time a year, the schedule for modern jet engine MRO operations averages about 12 years or more.

What RPM do jet engines run at?

For example, large jet engines operate around 10,000-25,000 rpm, while micro turbines spin as fast as 500,000 rpm. Mechanically, gas turbines can be considerably less complex than internal combustion piston engines.

Do planes use more fuel at higher altitudes?

Climbing to a higher altitude allows the jet to operate in thinner air, where fuel economy is better and drag is reduced for longer. Although it is counterintuitive, climbing to a higher altitude and then descending can save fuel.

Are planes faster at higher altitudes?

The higher the better

One of the central reasons behind aircraft altitude is that, as the air gets thinner with every foot climbed, planes can travel more easily and therefore move faster and burn less fuel, saving money.

Do jet engines need air?

Airplane engines need oxygen for combustion. … At high altitude, there isn’t much resistance because of the lack of oxygen. That makes it easier for the plane to fly, which means the engines don’t need to push very hard to maintain high speeds. They do still need oxygen, though, even at for low power levels.

How does a jet 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.

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