GE90-115B Turbofan Engine: Thrust Analysis

In summary: Unfortunately, the NASA article does not provide information on these velocities. In summary, Fred Garvin said that the bypass air delivers a thrust of about 20,000 lbs, while the hot exhaust gas delivers a thrust of about 115,000 lbs.
  • #1
vincentryan
29
0
Hi,
i am trying to increase the jet engine thrust. today most of the aircrafts are using high bypass ratio turbofan engine. thurbofan engine delivers thrust in two steps
one: hot exhuast gas
second : by pass air
how i have to find the thrust developed by the bypass air?
how i have to find the thrust developed by the hot exhaust gas?
GE90- 115B turbofan engine delivers total thrust of 115,000 pounds of thrust, in that how much amount of thrust delivered by the bypass air and by the hot exhaust gas?
 
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  • #2
Welcome to PF, Vincent.
I believe that Fred Garvin is the guy to answer your questions. Bear in mind, though, that since he designs jets for a living, he won't give you any proprietory information.
 
  • #3
I'll defer to Fred on this, but I've looked at lots of articles and not one showed the fraction of thrust from the jet exhaust or bypass flow. I would guess that the exhaust thrust is about 20,000 lbs or so, based on the CFM56 technology.
http://www.cfm56.com/index.php?level2=engines&level3=1126

I did find some cool stuff though.

http://www.snecma.com/IMG/pdf/GE90_Anglais-2.pdf

http://www.ihi.co.jp/ihi/file/technologygihou2/10006_1.pdf

See also - http://books.google.com/books?id=VpJEm7cFVE4C&pg=PA26&lpg=PA26&dq=%22jet+engine%22,%22bypass+ratio%22&source=web&ots=z26WF1wyEI&sig=-kAx30UTrX4CaJpK5dAN_hJeMTE&hl=en#PPA21,M1

http://en.wikipedia.org/wiki/GE90
 
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  • #4
answer

Thanks for your reply. i have found answer for my question from the NASA Website. please clilk on the link to know about turbofan thrust equation.http://www.grc.nasa.gov/WWW/K-12/airplane/turbfan.html"
 
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  • #5
That is exactly correct. However, you will not always know the velocities of each stream as required by that page. You may need to delve farther into the thermodynamic relations for the turbofan cycle. You may look to this (usually one starts with known conditions at the inlet and works their way to the back end of the engine):

http://en.wikipedia.org/wiki/Jet_Engine_Performance
 
  • #6
Just as Fred mentioned, one needs to know the velocities of the jet exhaust and bypass flow (exit).
 

1. How much thrust does the GE90-115B Turbofan Engine produce?

The GE90-115B Turbofan Engine produces a maximum thrust of 115,300 pounds, making it the most powerful commercial jet engine in the world.

2. What is the fuel efficiency of the GE90-115B Turbofan Engine?

The GE90-115B Turbofan Engine has a high fuel efficiency, with a specific fuel consumption (SFC) of 0.325 lb/lbf-hr. This means that for every pound of thrust produced, the engine consumes 0.325 pounds of fuel per hour.

3. What materials are used in the construction of the GE90-115B Turbofan Engine?

The GE90-115B Turbofan Engine is predominantly made of lightweight and durable materials such as titanium, carbon composites, and advanced alloys. These materials are carefully selected to withstand the high temperatures and stresses of the engine's operation.

4. How does the GE90-115B Turbofan Engine achieve such high thrust?

The GE90-115B Turbofan Engine uses a twin-spool architecture, where two concentric shafts rotate at different speeds. This design allows for better compression and expansion of air, resulting in higher thrust. Additionally, the engine has a large fan diameter and advanced aerodynamics for increased efficiency.

5. What is the role of thrust reversers in the GE90-115B Turbofan Engine?

The GE90-115B Turbofan Engine is equipped with thrust reversers, which are used to redirect the exhaust gases in the opposite direction during landing. This helps to slow down the aircraft and reduce the landing distance needed, making it safer and more efficient.

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