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Why is the most efficient altitude of operation for a turbofan engine not at sea level?
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.
How does altitude affect engine thrust?
The reduction in air mass flow rate is due to the lower air density at higher altitude hence reduces amount of engine thrust. At this altitude, the effect of air density is dominant. As a result, the engine is required to burn more fuel to provide a higher thrust to sustain the aircraft speed.
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 an altitude effect affect a turbofan engine?
Altitude effects on turbofan engines are driven primarily by the availability of air to be burned, meaning total available thrust decreases with altitude. Because turbofans continue to produce thrust at high speeds, the aircraft is able to balance reduced thrust output at altitude against lower atmospheric density.
How does a turbofan engine work in an airplane?
Put simply, by forcing air out the back of the engine at high-speed, the airplane is pushed forward. In some engines, there’s a mixer in the exhaust nozzle as well. This simply mixes some of the bypass air flowing around the engine with the hot, combusted air, making the engine quieter.
Which is more efficient, a turboprop or a turbofan?
Because turbofans continue to produce thrust at high speeds, the aircraft is able to balance reduced thrust output at altitude against lower atmospheric density. As a result of these factors, turbofan engines are most efficient relative to operating speeds at higher altitudes.
What is the bypass ratio of a turbofan engine?
The ratio of the air that goes around the engine to the air that goes through the core is called the bypass ratio . Because the fuel flow rate for the core is changed only a small amount by the addition of the fan, a turbofan generates more thrust for nearly the same amount of fuel used by the core.