I've been stood on the ground as a jet (an executive jet - not sure which model) had a compressor stall whilst taking off a few hundred feet away. The noise was one of those "thuds" you feel in your chest - despite the usual noise of the engine itself. The aircraft was able to climb away leaving a cloud of black, sooty smoke were the engine had "flashed". The aircraft returned to the airfield a few minutes later apparently with both engines running. We were quite used to aircraft noise, but that abrupt sonorous "boom" made everyone jump! Apparently this was the first operation of the aircraft after some maintenance involving the engines and was some kind of trial flight, but I don't know any details. I just recall throwing my cup of tea over myself!
I will explain from what i understood (correct me if iam wrong) In normal condition incoming air gets pressurized at each stage of compressor. When there is a breakdown of incoming air it is known an stall (since continuous flow air is stalled) which results in high pressure at any of the stage and reverse flow of incoming air which is known as surge
Great video. Good point about keeping an engine running even if idle thrust is all it can manage. That engine likely has a generator that will function, a hydraulic pump that will function and to a lessor degree bleed air. If EGT is stable within limits keep it running.
Two questions. Do compressor stalls occur when the rotors and stators are at a high angle of attack? Why would an area of high pressure in the compressor be bad? Isn't the job of the compressor to pressurize air? Many thanks!
First question. yes that is one incident of compressor stall, when the blades loses "lift" much like the wing of the plane. Second Question. In abnormal circumsatnces, when the pessure build up in the combustion chamber is higher than the compressor stages, the air tends to reverse flow and this causes Engine surge or stall. This occurs when the throttle setting is high but the air flowing into the engine is reduced by a crosswind etc.
It is not abnormal for a row of blades to stall locally, depending on the compressor airflow and blade rotation speeds. Especially during off engine design points like taxi, and decent, where compressor bleeds are activated for compressor stability. If a stall propagates to the extend that it becomes severe enough, you eventually reach a surge. But they are two different things. Engines incorporate variable stators that direct airflow accordingly to prevent very high or very low angles of attach depending on power setting, mach numbers etc.
Having experienced stall at high altitude where the engine produces less thrust and therefore where the effects of a stall are less dramatic, I would add that one of the most salient features of a stall is the startle factor (noises, vibrations). And also that despite it being very perceptible, it might be difficult to notice abnormal indications on the instruments.
@@AbiRizky which in turn can lead to catastrophic engine failure and (possible) damage to the aircraft. In that case an RTB is immediately warranted. That's one reason you never choose to sit near the engine if at all possible.
Rotating stall is peculiar to a. Axial flow compressors blade passage b. centrifugal flow compressors blade passage C. axial flow turbine blade passage D. Wing section of turbojet aircraft
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A genuine “ thank you “ for clearing it up.
A genuine thanks for watching :)
Loving these videos, thanks for taking the effort! Please continue to upload!
more coming soon thanks
I've been stood on the ground as a jet (an executive jet - not sure which model) had a compressor stall whilst taking off a few hundred feet away. The noise was one of those "thuds" you feel in your chest - despite the usual noise of the engine itself. The aircraft was able to climb away leaving a cloud of black, sooty smoke were the engine had "flashed". The aircraft returned to the airfield a few minutes later apparently with both engines running. We were quite used to aircraft noise, but that abrupt sonorous "boom" made everyone jump!
Apparently this was the first operation of the aircraft after some maintenance involving the engines and was some kind of trial flight, but I don't know any details. I just recall throwing my cup of tea over myself!
I will explain from what i understood (correct me if iam wrong)
In normal condition incoming air gets pressurized at each stage of compressor. When there is a breakdown of incoming air it is known an stall (since continuous flow air is stalled) which results in high pressure at any of the stage and reverse flow of incoming air which is known as surge
Such a great video! Special thanks to you
Great video. Good point about keeping an engine running even if idle thrust is all it can manage. That engine likely has a generator that will function, a hydraulic pump that will function and to a lessor degree bleed air. If EGT is stable within limits keep it running.
Wow what a great help to my safety investigation! Thanks a million!
I'll keep an eye out for that virbration!
Thank you for easy explanation.
your welcome! more on the way
Thank you, now I know why sven is banging on the engine in a Viggen.
Thank you, i finally know why this happens now.
Perfect explanation! Thank you :-)
Cheers :)
Great video.
My 240sx Twin Turbo Be Like
1:13
Looks cool. Im a big fan of 240sx :D
Please make more vids.. very clear and reasonable explanations! Thanks
More on the way mate! summer has just been really busy :)
Two questions.
Do compressor stalls occur when the rotors and stators are at a high angle of attack?
Why would an area of high pressure in the compressor be bad? Isn't the job of the compressor to pressurize air?
Many thanks!
yes but its when the high pressure can come out the front that its bad mate :) thanks for watching
First question. yes that is one incident of compressor stall, when the blades loses "lift" much like the wing of the plane.
Second Question. In abnormal circumsatnces, when the pessure build up in the combustion chamber is higher than the compressor stages, the air tends to reverse flow and this causes Engine surge or stall. This occurs when the throttle setting is high but the air flowing into the engine is reduced by a crosswind etc.
It is not abnormal for a row of blades to stall locally, depending on the compressor airflow and blade rotation speeds. Especially during off engine design points like taxi, and decent, where compressor bleeds are activated for compressor stability. If a stall propagates to the extend that it becomes severe enough, you eventually reach a surge. But they are two different things.
Engines incorporate variable stators that direct airflow accordingly to prevent very high or very low angles of attach depending on power setting, mach numbers etc.
Good! Thanks
Having experienced stall at high altitude where the engine produces less thrust and therefore where the effects of a stall are less dramatic, I would add that one of the most salient features of a stall is the startle factor (noises, vibrations). And also that despite it being very perceptible, it might be difficult to notice abnormal indications on the instruments.
Thanks
Thanks for the explanation!! so is it one of the teething problem that loomed 747 when it was launched?
Thank you!!!
your welcome mate! thanks for watching
What is EDT stand for please?
Is there any difference between engine stall and engine surge?
So generally it isn't dangerous?
Very, surging in general may cause failure to the compressor blades
@@AbiRizky which in turn can lead to catastrophic engine failure and (possible) damage to the aircraft. In that case an RTB is immediately warranted. That's one reason you never choose to sit near the engine if at all possible.
Rotating stall is peculiar to
a. Axial flow compressors blade passage b. centrifugal flow compressors blade passage
C. axial flow turbine blade passage
D. Wing section of turbojet aircraft
Im here because of PAL Airline fire, *they (passengers) are all fine*
chabizar hohohohoho
after PAL B777 Flight PAL113/PR113 incident then i go here and re watch this video
they must have watched my video because they felt with the problem perfectly XD haha
Same. 😅
"Compressor Stool"? - It occurs when you throw a stool into a running jet engine - then just remain cüül =:))
lol