Screens On Jet Intakes? — Civil Aviation Forum

Sponsor Message:


My Starred Topics \| Profile \| New Topic \| Forum Index \| Help \| Search

Screens On Jet Intakes?

Corey777 From , joined Dec 1969, posts, RR:
Posted (12 years 11 months 3 weeks 1 day 19 hours ago) and read 835 times:

With the constant hazard of FOD and bird-strikes etc. why don't engine mfr's put screens or something over the intakes of jet engines? Is there some technical problem which would preclude this? or is it just the engine mfr's saving $$?

8 replies: All unread, jump to last

Iahcsr From United States of America, joined Jun 1999, 3308 posts, RR: 46
Reply 1, posted (12 years 11 months 3 weeks 1 day 19 hours ago) and read 771 times:

Support Airliners.net - become a First Class Member!

$$ has nothing to do with it. Such a screen would interfere/reduce the airflow into the engine, causing more problems then benefits.

Working very hard to Fly Right....

VC-10 From United Kingdom, joined Oct 1999, 3677 posts, RR: 37
Reply 2, posted (12 years 11 months 3 weeks 1 day 19 hours ago) and read 770 times:

The Intakes are made as small as possible to reduce the drag, a screen would increase the drag & restrict airflow. Additionally an aero engine spends 99% of its time out of the flight regime where there is a high risk of damage so the cost's of such a thing if it were possible would not justfy it.

Big777jet From , joined Dec 1969, posts, RR:
Reply 3, posted (12 years 11 months 3 weeks 1 day 19 hours ago) and read 762 times:

It won't work for the jet engine!! Try test yourself what is the between difference open your window with screen and without screen. How it does feel wind air? Screen is insufficent pressure air! There is no way to help! Sorry!

Corey777 From , joined Dec 1969, posts, RR:
Reply 4, posted (12 years 11 months 3 weeks 1 day 19 hours ago) and read 754 times:

Hmm...guess I can't make my fortune selling anti-FOD screens to P&W...back to the drawing board!!

Corey

Top Gun From Canada, joined May 1999, 101 posts, RR: 2
Reply 5, posted (12 years 11 months 3 weeks 1 day 18 hours ago) and read 740 times:

lets give out heads a shake here. i can see no one knows any physics, or they forgot to post it here. A 2kg bird flying into a "Screen" that is moving at 150 knots at takeoff/Climbout (think realitvity here). You would need a cement wall to stop it, why do you think that the metal is bend to Kingdome come after a strike? Sorry boys, simply not feasible. Covering the main Cowl with a "Screen" doesn't nessiarly reduce air intake, have a look at the modified J-58's on the SR-71.

Spacepope From Vatican City, joined Dec 1999, 2738 posts, RR: 1
Reply 6, posted (12 years 11 months 3 weeks 1 day 18 hours ago) and read 734 times:

On MiG 29 series aircraft, and have been for some years now. they are deployed during taxi and takeoff regimes of flight, and retracted during normal flight. I've tried to find photos on the web, but these search engines are no help. But trust me, i've seen them in action. they look like plates with small slots that come from the top of the intakes down to match its profile. maybe you all will have better luck locating an image. Helicopters uese defector plates to siphon sand and debris as well, consisting of a plate that causes a sharp bend in airflow into the engine. this sharp turn causes heavier particles to be thrown clear of the intake (because their mass causes their angular momentum to throw them clear) and the lighter less dense fluids (air) is ingested. not practical at high speeds or altitudes though.

The last of the famous international playboys

VC-10 From United Kingdom, joined Oct 1999, 3677 posts, RR: 37
Reply 7, posted (12 years 11 months 3 weeks 1 day 17 hours ago) and read 729 times:

There is a big difference in mass airflow between a Mig-29, SR-71 & helicopter engines and a high by-pass fan engine so I don't believe that system would work.

JETPILOT From United States of America, joined May 1999, 3130 posts, RR: 32
Reply 8, posted (12 years 11 months 3 weeks 1 day 16 hours ago) and read 723 times:

Screens would be a great place for ice to collect. When it breaks off guess where it goes. What a horrendous idea.

Top Of Page

Forum Index

This topic is archived and can not be replied to any more.

Printer friendly format

Similar topics: