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Why are there swirls on plane engines?
The primary function of the spiral is to warn the ground crew working around the aircraft that the engine is on and to ensure nobody comes up too close to the running engine. When the engine is running, you will see a white almost transparent blur or a hypnotizing swirl, depending on the rotation speed of the engine.
What is aircraft engine nacelle?
A nacelle (/nəˈsɛl/ nə-SEL) is a “streamlined body sized according to what it contains” such as an engine, fuel, or equipment on an aircraft. When attached by a pylon entirely outside the airframe it is sometimes called a pod in which case it is attached with a pylon or strut and the engine is known as a podded engine.
What is the function of nacelle?
The nacelle is the part of the turbine that houses the components that transform the wind’s kinetic energy into mechanical energy to turn a generator that produces electricity.
Why do Boeing planes have serrated engine nacelles?
Why do Boeing’s new generation of jets (787, 747-8, 777X, 737MAX) have serrated engine nacelles whilst Airbus’ latest (A350, A320neo etc) do not? I understand that Boeing’s nacelles reduce turbulence and therefore noise.
What kind of propulsion system does the 787 have?
The variable frequency starter generator delivers many benefits, including the replacement of the heritage bleed air system. The 787 main electrical power generation and start system is a four-channel variable frequency system with two 250 kVA VFSGs on each of the two main engines.
Why does the Boeing 707 have a scalloped exhaust?
The Rolls-Royce Conway (as used on the Boeing 707) had a scalloped exhaust which improved jet mixing and reduced exhaust noise. Since the Conway was also the first operational bypass engine, the lower exhaust speed of this design helped to reduce noise already.
How does the Trent 1000 engine work on a 787?
Allow power to be extracted for each VFSG through the second of the three engine shafts. This unique solution using the Trent 1000 engine architecture brings with it lower engine idle speeds, which reduce fuel burn and noise on the 787.