keta
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Who Designs Engine Nacelles?

Mon Jun 13, 2005 8:17 pm

The jet engine inlet is a crucial part for engine efficiency. It must be well designed so the air flows correctly into the engine. So, I'd say that the engine manufacturer does this job. But doesn't the nacelle modify the airflow around the wing? I guess that the aircraft designer has to take this into account. I too remember Airbus saying that one of the advantages introduced in the A380 was the efficient design of the nacelles (I think based in the A346 work). So, who designs the nacelles?

Cheers,

Keta
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broke
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RE: Who Designs Engine Nacelles?

Mon Jun 13, 2005 9:48 pm

My experience is in older airplanes. On the DC-8, the nacelles were designed by either Douglas, the engine manufacturer, or the STC holder.
For instance; on the DC-8-50 series and the DC-8-61 the nacelle was designed by P&WA. On the DC-8-62 and DC-8-63, the nacelle is a Douglas design.
On the DC-8-70 series, the nacelle was designed by Camacorp which was the company that developed the STC changing the -60's to -70's.

It all depends on the circumstances and how much risk and design sharing is contacted when developing an airplane.
 
aeroweanie
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RE: Who Designs Engine Nacelles?

Tue Jun 14, 2005 2:01 am

Boeing designed the first JT9D nacelles and the responsibility was split between the aero group (everything outside the stagnation point) and the propulsion group (everything inside the stagnation point). I believe that GE and RR have always designed their own nacelles. P&W started to design their own nacelles in the early 1980s.
 
PlainSmart
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RE: Who Designs Engine Nacelles?

Tue Jun 14, 2005 3:49 am

Generally today most manufactures of engines design inlets because they spend a lot of time and money engineering how the air will flow through the engine. For military applications this is especially true for supersonic jets to control the shocks and velocities of the air hitting the compressor.
 
727EMflyer
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RE: Who Designs Engine Nacelles?

Tue Jun 14, 2005 4:02 am

Evidence of the engine manufacturer designing the nacelles can be seen by looking at a RR example. Look at the similarity of nacelle design among RR and IAE (PW, RR, and others) installations on these four aircraft from three different manufacturers: Boeing 744, 752; McDonnel Douglas MD-90; and Airbus A320

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The similarity is lesser on the MD-90, and there isn't an alternate manufacturer to compare against but I think you can still see the influence.

Another thing to think about with nacelles is that they affect how the bypass air mixes with the exhaust from the core. With the evolution of turbofan's you can see how the nacelles duct the bypass air further along the length of the engine. You can see a good example by looking at early design PW4000's used on 767 vs. the more recent 4000's built for 777's

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G4Doc2004
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RE: Who Designs Engine Nacelles?

Tue Jun 14, 2005 5:36 am

On bizjets, I see a lot of nacelles made by Nordam and Rohr.
"Failure to prepare is preparing to fail"--Benjamin Franklin
 
gigneil
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RE: Who Designs Engine Nacelles?

Tue Jun 14, 2005 7:57 am

The nacelles for the GP7200 are designed by Huriel-Hispano, if I'm not mistaken.

N
 
FTOHIST
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RE: Who Designs Engine Nacelles?

Tue Jun 14, 2005 8:11 am

You're not mistaken...they are designed by HH.
 
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lightsaber
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RE: Who Designs Engine Nacelles?

Tue Jun 14, 2005 5:01 pm

Quoting AeroWeanie (Reply 2):
P&W started to design their own nacelles in the early 1980s.

Pratt designed the Nacelle on the A330 and due to the potential profit would like to design more nacelles. The pw4000 94" (4056/4062/4262, etc.) actually use the same nacelle as the GE CF-6!

Many nacelles are designed by BF Goodrich. Just like engines, nacelle manufacturers compete for the design win.

Does anyone know the 787 nacelle vendor? With GE and RR sharing a nacelle... its going to be a cat fight to have it optimized for each engine.

Quoting 727EMflyer (Reply 4):
Evidence of the engine manufacturer designing the nacelles can be seen by looking at a RR example.

RR likes to mix the fan and turbine air to quiet the engine. This philosophy was extended to the V2500. If you look at the pw6000 nacelle, you'll see that all mixing nacelles look very similar from the external perspective. Alas, I don't know who designs the nacelles for RR (or if they do their own).

Lightsaber
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whitehatter
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RE: Who Designs Engine Nacelles?

Tue Jun 14, 2005 7:09 pm

Quoting Lightsaber (Reply 8):
RR likes to mix the fan and turbine air to quiet the engine. This philosophy was extended to the V2500. If you look at the pw6000 nacelle, you'll see that all mixing nacelles look very similar from the external perspective. Alas, I don't know who designs the nacelles for RR (or if they do their own).

However they have gone back to a more conventional design on the Trent 500, 800, 900 and 1000.
Lead me not into temptation, I can find my own way there...
 
keta
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RE: Who Designs Engine Nacelles?

Wed Jun 15, 2005 3:28 am

Thanks for the info guys!  wave 
Where there's a will, there's a way
 
jeb94
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RE: Who Designs Engine Nacelles?

Sun Jun 19, 2005 6:18 pm

For most jet aircraft, the nose cowl, cowl doors, and thrust reverser are all rovided by the airframe manufacturer. They may very well have been designed by another company for specific applications but it is the airframe manufacturer that provides them on the aircraft. P&W, GE, RR, Williams, etc just build the engines.
 
Lumberton
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RE: Who Designs Engine Nacelles?

Tue Jan 17, 2006 2:03 am

Quoting 727EMflyer (Reply 4):
Another thing to think about with nacelles is that they affect how the bypass air mixes with the exhaust from the core.

So is this what the tapering (cone shape) accomplishes? I thought the gases were mixed within the engine itself, but I am no engineer? Aren't there also aerodynamic considerations in nacelle design?
"When all is said and done, more will be said than done".
 
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HAWK21M
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RE: Who Designs Engine Nacelles?

Tue Jan 17, 2006 4:48 pm

I may not win often, but I damn well never lose!!! ;)
 
liedetectors
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RE: Who Designs Engine Nacelles?

Wed Jan 18, 2006 12:11 pm

Quoting Jeb94 (Reply 11):
For most jet aircraft, the nose cowl, cowl doors, and thrust reverser are all rovided by the airframe manufacturer.

Not true. The cowl and the nozzle (and TRU in the case of a bucket setup) are designed by the engine manufacture with input from the airframe manufacturer. The thrust reverser is contracted out and the engine manufacter will coordinate with them. Think about it, inorder for an engine to work properly, the size of the inlet area and nozzle are crutial for proper operation of the engine. Therefore the engine maker must have control over it.

The design of the nacelle is done by both the engine manufacter and the airframe manufacter. The airframe manufacturer will define how many accessories must be hooked to the engine. ie gearboxed, FADECs etc. On some engines you may notice a buldges or asymetries in the nacelle. This is where the gearboxes and such are.

On a side note, the pylon is sized by the ECS system maker as they must size the ducts to handle the bleed offtake from the engine. Sometimes the preecoolers are found here. The aerodynamics group at the airframe maker will then design an airfoil shaped fairing around the engine mounts and bleed ducts.
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lehpron
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RE: Who Designs Engine Nacelles?

Sun Jan 22, 2006 2:44 pm

Question about the tail cone behind the turbine: Does it act as an aerospike ramp, providing a bit of thrust by expanding any jet exhaust pressure? Or is the thrust pressure fully expanded aft of the turbine? Or is the turbine cone something for higher altitude pressure efficiency than ground level?
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