« previous next »
Pages: [1]   Go Down

Author Topic: Compressor Blade Stall?  (Read 735 times)

Offline Seagoon

  • Gold Member
  • *****
  • Posts: 2396
      • http://www.providencepca.com
Compressor Blade Stall?
« on: October 27, 2005, 10:10:24 PM »
Hi Guys,

Was reading about the physics of various Jet Engines today and was interested to note how various air intakes in fighters are designed to "separate the air flow" so that the air that has been slowed down via friction from contact with the fuselage isn't sucked in. One of the reasons this is important, I learned, is that it can lead to "compressor blade stall" which is apparently very, very, bad.

Can someone explain what Compressor Blade Stall is and a brief explanation of the physics involved, keeping in mind that I failed Algebra twice in a row. ;)

Thanks!

SEAGOON
Logged
SEAGOON aka Pastor Andy Webb
"We have no government armed with power capable of contending with human passions unbridled by morality and religion... Our Constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other." - John Adams

Offline Dago

  • Parolee
  • Platinum Member
  • ******
  • Posts: 5324
Compressor Blade Stall?
« Reply #1 on: October 27, 2005, 10:13:39 PM »
In a nutshell, when the airflow momentarily stops or reverses direction in the compressor (front) section of a jet engine.  

Can sound very dramatic.  Can make flame shoot out the back of the engine (and front too in some stalls).

Doesnt often result in damage, but is some cases it can, including bending compressor blades.

dago
Logged
"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, chocolate in one hand, martini in the other, body thoroughly used up, totally worn out and screaming "WOO HOO what a ride!"

Offline Charge

  • Gold Member
  • *****
  • Posts: 3414
Compressor Blade Stall?
« Reply #2 on: October 28, 2005, 05:40:48 AM »
« Last Edit: October 28, 2005, 05:55:52 AM by Charge »
Logged
"When you wish upon a falling star, your dreams can come true. Unless it's really a giant meteor hurtling to the earth which will destroy all life. Then you're pretty much screwed no matter what you wish for. Unless of course, it's death by meteorite."

Offline Dinger

  • Silver Member
  • ****
  • Posts: 1705
Compressor Blade Stall?
« Reply #3 on: October 28, 2005, 06:31:02 AM »
Yup. Big bang, flames shoot out, plane lurches like somebody smacked it with a baseball bat. Passengers break out in derisive applause. Nobody speaks of it again.
Logged

Offline Heater

  • Silver Member
  • ****
  • Posts: 1381
Compressor Blade Stall?
« Reply #4 on: October 28, 2005, 09:06:02 AM »
A "blade stall" is not as bad as a full compressor stall, and yes you can have both, as a stall is a disruption of the airflow.

and a bad stall looks somthing like this,



this is actuly an "Afterbunner blowout" but  stall will produce the same effect, but it comes out both ends
« Last Edit: October 28, 2005, 09:11:53 AM by Heater »
Logged
HiTech is a DWEEB-PUTZ!
I have multiple personalities and none of them like you !!!

Offline Ripsnort

  • Radioactive Member
  • *******
  • Posts: 27260
Compressor Blade Stall?
« Reply #5 on: October 28, 2005, 10:06:57 AM »
Sadly, this is what ended Bong's life at a critical time inflight,  just after crossing the runway boundary on take off, at 60 feet in the air. :(
Logged

Offline Habu

  • Silver Member
  • ****
  • Posts: 1905
Compressor Blade Stall?
« Reply #6 on: October 28, 2005, 09:08:21 PM »
Who was Bong?
Logged

Offline Simaril

  • Platinum Member
  • ******
  • Posts: 5149
Compressor Blade Stall?
« Reply #7 on: October 28, 2005, 10:08:26 PM »
Quote
Originally posted by Habu
Who was Bong?


You know, trolls are against the rules....
Logged
Maturity is knowing that I've been an idiot in the past.
Wisdom is realizing I will be an idiot in the future.
Common sense is trying to not be an idiot right now

"Social Fads are for sheeple." - Meatwad

Offline Roscoroo

  • Plutonium Member
  • *******
  • Posts: 8424
      • http://www.roscoroo.com/
Compressor Blade Stall?
« Reply #8 on: October 29, 2005, 05:22:15 AM »
A flame out in a "combustion can" along with a sudden explosion of raw fuel can cause a full compresser stall . "Variable stator bladed" compressers also comp stall fairly easy .  its a noise that you dont forget thats forshure.
Logged
Roscoroo ,
"Of course at Uncle Teds restaurant , you have the option to shoot them yourself"  Ted Nugent
(=Ghosts=Scenariroo's  Patch donation

Offline Lye-El

  • Silver Member
  • ****
  • Posts: 1466
Compressor Blade Stall?
« Reply #9 on: October 29, 2005, 11:49:36 AM »
Had a Cobra helicopter compressor stall on run up once. Chug, chug, chug...fire out the doghouse, aircraft slewed on the pad. Was impressive.


When the sargent started to back away from the aircraft the two Spec 4s standing there (me being one) unassed the A.O. i.e. we started to run until we heard the engine start winding down.  

The whole drive train was replaced from engine to tailboom from being overstressed.
:O
Logged


i dont got enough perkies as it is and i like upen my lancs to kill 1 dang t 34 or wirble its fun droping 42 bombs
Pages: [1]   Go Up
« previous next »