Armadillo1
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anti-bird grading on engines

Fri Aug 16, 2019 4:49 pm

Image

dont know how in english - lathing, lattice


i believe this topis already discussed, but of course now it will be raised again so will be nice to read previous discussions
 
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flyingturtle
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Re: anti-bird grading on engines

Fri Aug 16, 2019 8:13 pm

If the grilles work, a couple of birds will just clog the grille.

If the grilles don't work, the birds will just get diced by the grille, leading to a unpleasantly coughing engine.

Fighter jets that operate from un-improved air strips often have these grilles, but as a protection against rocks. The Su-27 and Mig-29 even have intakes at the top, for the same reason. See this discussion: viewtopic.php?t=1020459
Reading accident reports is what calms me down
 
Armadillo1
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Re: anti-bird grading on engines

Fri Aug 16, 2019 8:20 pm

only older version of MiG-29 have top intakes. Not for flankers.

so engines need not a grill but grinder, and the fan already doing this?
 
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flyingturtle
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Re: anti-bird grading on engines

Fri Aug 16, 2019 8:51 pm

Armadillo1 wrote:
so engines need not a grill but grinder, and the fan already doing this?


Somewhat.

And the fact that much of the air flow bypasses the engine core is also helpful.
Reading accident reports is what calms me down
 
Armadillo1
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Re: anti-bird grading on engines

Sat Aug 17, 2019 12:23 am

for more fun
Image
from here:
https://igor113.livejournal.com/51213.html

unfortunatly, no more info about test grill.
 
peterinlisbon
Posts: 1521
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Re: anti-bird grading on engines

Sun Aug 18, 2019 1:14 pm

It would probably disturb the airflow and add to fuel consumption, which is why I imagine they don't do it.
 
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fr8mech
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Re: anti-bird grading on engines

Sun Aug 18, 2019 2:37 pm

A screen fine enough to adequately protect from birds, would most certainly require anti-ice protection.

I’ll add, that a bird-strike capable of damaging an engine, sufficient enough to shut it down, is not a single bird. It’s a flock of birds. That same strike on a screen would likely a) destroy the screen and drive the whole mess through the engine, or b) obstruct the airflow to the point of compressor stall(s).
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RetiredWeasel
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Re: anti-bird grading on engines

Sun Aug 18, 2019 3:06 pm

The A-37 'Dragonfly' had intake screens. However these were designed to prevent FOD to the extremely sensitive J-85s during taxing and takeoff roll. Once wheels were off the ground the screens folded under the intakes. Didn't help for bird strikes unless it was on takeoff.

Image
 
Viper911
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Re: anti-bird grading on engines

Sun Aug 18, 2019 3:17 pm

In the entire history of modern civil aviation we had what, just 2,3 cases of dual engine failure due to birds ingestion. Developing and certifying such a protection system, for an occurrence that happens once per X millions of flights is just not economical. It's far more practical to develop and implement Some "anti birds" procedures or a systems directly at airport grounds.

Viper911
 
TSS
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Re: anti-bird grading on engines

Thu Aug 22, 2019 5:28 am

Armadillo1 wrote:
for more fun
Image
from here:
https://igor113.livejournal.com/51213.html

unfortunatly, no more info about test grill.


It hadn't occurred to me before but I bet seabird ingestion was a continuous problem for those.

A while back, probably several years ago now, one of the major fighter jet manufacturers experimented with using lots of small holes on the leading edge of the wing instead of single large intakes for each engine. Apparently the benefits of such a design were nil if not negative, but it would have solved the bird ingestion issue.
Able to kill active threads stone dead with a single post!
 
Armadillo1
Topic Author
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Re: anti-bird grading on engines

Thu Aug 22, 2019 7:04 am

looking at that dints on nacelles i bet it was a problem
 
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afterburner
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Re: anti-bird grading on engines

Thu Aug 22, 2019 7:49 am

It's "grating" not "grading", from the word "grate".

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