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What is the difference between high bypass and low bypass turbofan?
Wiki User
∙ 12y ago
The difference between the low and high bypass turbofans is simply in the amount of air which goes into the engine versus the remainder that goes around (bypasses) the engine.
In high bypass engines ( an engine on any large commercial jet) only 20% around 20% of air goes into the engine with 80% bypassing it. (The 80% generates most of the engine thrust)
In low bypass engines, this ratio is much lower
Wiki User
∙ 12y ago
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High Bypass turbofan engines use pneumatics (air) for starting the engines.
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What type of starting system in high bypass turbofan engine?
High Bypass turbofan engines use pneumatics (air) for starting the engines.
How is an Airbus propelled?
Airbus airliners use high bypass turbofan jet engines.
Which engine is more efficient in jet engines. Turbo jet or the Turbo fan?
The term "Turbofan" is actually quite broad, but can be broken down into two categories…high and low bypass. The question you are really trying to ask is which engine type (high bypass or low bypass) turbofan engine is more efficient? High bypass engines are used on most commercial airplanes (except the Concord) and these engines are favorable because they have a balance of high thrust, and efficiency. Aircraft that need supersonic capabilities (like the Concord) use a low bypass turbofan engine. These engines produce the thrust required to propel a plane beyond the speed of sound, but at the cost of efficiency. They burn a lot of fuel in doing so. So one could draw the conclusion that high bypass turbofan engines are more efficient, but this would not be true. In order to propel a plane beyond the speed of sound the low bypass turbofan engine is the most efficient way of doing so. On the flipside, the high bypass turbofan engine is most efficient for practical air travel. Both engine types are very different, but each are specialized to achieve different goals.
What has the author Ronald H Soeder written?
Ronald H Soeder has written: 'Effect of combined pressure and temperature distortion orientation on high-bypass-ratio turbofan engine stability' -- subject(s): Airplanes, Turbofan engines
How does bypass produce thrust in turbofan engine?
There are two types of turbofan engines- high bypass and low bypass engines. About 80 percent of the total engine thrust from a high bypass turbofan engine is produced by the bypass of air around the core. These types of engines generally have a large fan in the front to pull in large volumes of air to produce such a powerful jet stream out the back. The front fan is driven by the compression, combustion, and expulsion of the hot gases out the back of the core. About 20 percent of the air pulled in from the front fan is used to drive the core. High bypass turbofan engines are used on almost all commercial jet aircraft because they burn less fuel. A low bypass engine is exactly the opposite. The core is used to drive a smaller fan in the front which only about 20 percent of the total volume of air pulled in is bypassed. The remaining 80 percent of the air being drawn into the engines core is compressed, combusted, and the hot gasses expelled out the back to produce the necessary thrust to propel a jet forward. Low bypass turbofan engines are found on jets that require supersonic speeds. These engines are incredibly powerful but at the cost of a high fuel burn rate.
How are the fighter aircrafts fast?
Fighter aircraft achieve high speeds by use of a high-efficiency turbofan engine. The air is compressed by high speeds and by a turbofan, and is mixed with gasoline. The highly flammable mix of gasoline and oxygen is ignited, and exhaust from the combustion propels the craft.
Could the Concorde be retrofitted with the GE90-115B?
No. It's too big to fit in the nacelle, it's the wrong kind of engine - the GE90 is a high bypass turbofan and Concorde needs turbojets - and it wouldn't matter anyway because they don't make Concorde parts anymore.
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How jet engin works?
The front fan spins at a high rate to pull in air. Once air is pulled in some of it passes through ducts around the engine core and out the back (high bypass turbofan engine) and a smaller amount of the air is pulled into the engines core. Once in the core it is compressed in stages (gradually gets compressed more and more). Then it enters the combustion chamber where it is mixed with fuel and ignited, then passes into the turbine area where it expands and is propelled out the back. In a high bypass engine as much as 80% of the engines total thrust comes from the air bypassing the core and 20% from the core itself. This engine type is perfect for high flying commercial jets because they are fuel efficient. The other type of engine is a low bypass turbofan engine. The principal is the same, but 80% of the total engines thrust is coming from the core whereas 20% of the thrust is bypassed. This is a good engine for supersonic aircraft, but most of the energy generated is from the burning of fuel. Keep in mind that there are many forms of high and low bypass engines each with slightly different fan sized, thrust output, bypass ratios etc.. to achieve an engine that is appropriate for the type of aircraft and its performance requirements.
