The airplane is flying around Mach 0.80 (below the speed of sound) but the air accelerates over the upper surface of the wing due to the airfoil shape and reaches local speeds well above Mach 1.0. (Higher velocity over the wing = lower air pressure = LIFT!) The shock wave is the point where the local air velocity drops back below sonic speed. This type of shock doesn't produce a sonic boom like a supersonic airplane would generate.
That’s because of different conditions that a supersonic jet has. Incompressible flows which deal with most commercial airliners tend to be between 0-300 mph free stream velocities and how under these conditions sometimes shocks can occur at the leading edge. Love fundamentals of aerodynamics
Great catch! Would you be okay with me featuring this in my series Weekly Dose of Aviation? Of course you will be credited both in the video and in the description. Thanks!
I first saw this on a trans-pacific flight...I knew what it was, but some primitive part of my brain was telling me I was in trouble. Thanks goodness for drink-service...
And to think my BB gun farts out a bb 3 times slower than the plane is traveling, which blows my mind. People are fine inside, eating, drinking soda and coffee, usimg the restroom, sleeping. Incredible
The shock dissipates only a short distance from the wing, so nothing would be passing by near enough to actually go through the shockwave and hear the boom
interesting. never considered that before. the only thing I am skeptical about is if the top flow over the airfoil does go partially supersonic in places would that not create turbulent and not laminar flow? turbulent flow would seem undesirable and therefore would not travelling slower be preferable to avoid this?
In some cases, turbulent flow is desired for high angle of attack operations since the higher energized flow sticks onto the surface longer before causing flow separation. And also at these speeds, laminar flow really only exists very close to the surface. It's mostly turbulent flow (which is okay).
Turbulence does these movements. These commercial planes don't cruise at sound speed. Also when plane come close Mach 1 , you need to see white colored air on the airfoils.
Not the case, this is a shockwave due to localised transonic flow over the top of the wing. The wiki article for 'supercritical airfoil' has a good diagram which shows what is going on.
No, flaps are for low speed. It’s to generate more lift so you can go slower for things like take-off and landing. If anything, flaps would just speed up the air over the top of the wing and make this much more noticeable.
@@kuhnville3145 ну, я, вообще, про то что крылья вверх-вниз качаются все время у А320. Как у птицы. Видимо, нестабильность из-за трансзвукового обтекания. Что-то вроде флаттера.
@@vasiapetrov1051 oh that kind of flap, not the aerodynamic control surface. pretty sure the flapping you're talking about is just flex in the wing anyhow
"Махание крыльями" особенно заметное на больших самолетах до прихода в них композитных элементов вызвано не этим. Причин этому 2: изменение нагрузки и шумовое возбуждение этой системы от набегающего потока воздуха. При некоторых маневрах крыло немного разгружается, что не только вызывает затухающие колебания но и уменьшает жесткость крыла от чего амплитуда вызванных случайным компонентом подъемной силы собсвенных колебаний также увеличивается. Кстати, резкие повороты при которых это хорошо заметно обычно происходят на скоростях гораздо ниже крейсерских и никаких заметных областей сверхзвукового обтекания при этом, конечно, не возникает.
My 2 braincells : "Sheeeesh, of course we know what we are looking at. Nobody is looking at us now, right? Where's the shockwave? We can't see 'cause probably we've already have our shockwave at the counter, when we heard the ticket prices."
It's localized supersonic flow over the top of the airfoil. An aircraft doesn't have to travel at supersonic speeds to have localized supersonic flow over the top airfoil. air travels faster over the top airfoil due to its curviture. This accelerates the air, relative to the aircraft, to supersonic speeds, creating a pressure differential(shock wave) which creates the visual phenomenon pictured in the video.
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The airplane is flying around Mach 0.80 (below the speed of sound) but the air accelerates over the upper surface of the wing due to the airfoil shape and reaches local speeds well above Mach 1.0. (Higher velocity over the wing = lower air pressure = LIFT!) The shock wave is the point where the local air velocity drops back below sonic speed. This type of shock doesn't produce a sonic boom like a supersonic airplane would generate.
LOL
That’s because of different conditions that a supersonic jet has. Incompressible flows which deal with most commercial airliners tend to be between 0-300 mph free stream velocities and how under these conditions sometimes shocks can occur at the leading edge. Love fundamentals of aerodynamics
Surely there is a litte bit of a boom? And what is thr next design of an airfoil that can fix this stuff?
@@gsmontagdudes flabbergasted that science exists there look 😂😂😂
I fly the A-320, we cruise at .78-.79.... .80 is rare
Great catch! Would you be okay with me featuring this in my series Weekly Dose of Aviation? Of course you will be credited both in the video and in the description. Thanks!
i love ur vids
that was 8 years ago so i don't think he's going to answer
@@TonyTheGato he answered a comment 3 days ago
@@r4f4w oh nice
@lucaas He approved someone else for a similar thing not too long ago
It is an interesting phenomenon to actually see. The first time I saw it I could hardly believe what I was seeing.
me too
I first saw this on a trans-pacific flight...I knew what it was, but some primitive part of my brain was telling me I was in trouble.
Thanks goodness for drink-service...
Doesn’t look like anything to me.
Neat stuff, thank you for sharing your video!!!!!!!
And to think my BB gun farts out a bb 3 times slower than the plane is traveling, which blows my mind. People are fine inside, eating, drinking soda and coffee, usimg the restroom, sleeping. Incredible
Exactly! Meanwhile, the BB looks like it has met the devil, has fought gremlins and was eaten by Medusa. Amazing what human beings can achieve.
Insane Capture! can i use this as part of my series for a video? you will be credited in the description and video!
Approved!
@@agermannamedhans thx!
@@agermannamedhans ❤
Does the transonic airflow create a Sonic boom?
I know it creates large amounts of noise but not a boom otherwise we will hear it everyday when a commercial jet flies overhead
The shock dissipates only a short distance from the wing, so nothing would be passing by near enough to actually go through the shockwave and hear the boom
Nope
No
No that’s hypersonics or supersonics
nice
interesting. never considered that before. the only thing I am skeptical about is if the top flow over the airfoil does go partially supersonic in places would that not create turbulent and not laminar flow? turbulent flow would seem undesirable and therefore would not travelling slower be preferable to avoid this?
Laminar flow is a bit of a rarity in high-speed aerodynamics anyway
In some cases, turbulent flow is desired for high angle of attack operations since the higher energized flow sticks onto the surface longer before causing flow separation. And also at these speeds, laminar flow really only exists very close to the surface. It's mostly turbulent flow (which is okay).
Just like Prof. Nagamatsu used to tell...
Kool!
Need to clean the window
Wow
Turbulence does these movements. These commercial planes don't cruise at sound speed. Also when plane come close Mach 1 , you need to see white colored air on the airfoils.
That's the Speed of the air above the Wing. It's faster than the Plane itself. That's not turbulence at all.
didnt even know that was possible
woah
Sorry but that's not a shockwave. You can also observe this at the wingtips or flap edges during landing. Those are simply "transparent" air vortices.
Not the case, this is a shockwave due to localised transonic flow over the top of the wing. The wiki article for 'supercritical airfoil' has a good diagram which shows what is going on.
letmegooglethat.com/?q=localized+supersonic+flow+over+a+supercritical+airfoil
Gotta love how people post those comments full of ego and then get disintegrated in a matter of seconds.
Kids had a lot of imagination back then.
Видать, из-за этого они все время крыльями машут.
No, flaps are for low speed. It’s to generate more lift so you can go slower for things like take-off and landing. If anything, flaps would just speed up the air over the top of the wing and make this much more noticeable.
@@kuhnville3145 ну, я, вообще, про то что крылья вверх-вниз качаются все время у А320. Как у птицы. Видимо, нестабильность из-за трансзвукового обтекания. Что-то вроде флаттера.
@@vasiapetrov1051 oh that kind of flap, not the aerodynamic control surface. pretty sure the flapping you're talking about is just flex in the wing anyhow
@@kuhnville3145 да. Речь об изгибах.
"Махание крыльями" особенно заметное на больших самолетах до прихода в них композитных элементов вызвано не этим. Причин этому 2: изменение нагрузки и шумовое возбуждение этой системы от набегающего потока воздуха. При некоторых маневрах крыло немного разгружается, что не только вызывает затухающие колебания но и уменьшает жесткость крыла от чего амплитуда вызванных случайным компонентом подъемной силы собсвенных колебаний также увеличивается. Кстати, резкие повороты при которых это хорошо заметно обычно происходят на скоростях гораздо ниже крейсерских и никаких заметных областей сверхзвукового обтекания при этом, конечно, не возникает.
it should be behind trailing edge
Why?
It must happen at the point where the speed of air is at its most, in this case - highest point of the airfoil
@@igorgoncharov3191 no shock wave must be behind trailing edge
My 2 braincells : "Sheeeesh, of course we know what we are looking at.
Nobody is looking at us now, right? Where's the shockwave?
We can't see 'cause probably we've already have our shockwave at the counter,
when we heard the ticket prices."
its just a glitch lol
I don't see anything 💀
Crank up your image quality to at least 720p and you'll see what looks like a ripple in the air near the rear most dark band on the wing.
so its those pointy line things that appear?@@alexanderstewart8601
In my country we call it a wing
No. There is no supersonic airflow over this airliners wing. Not possible even at high cruise speed.
letmegooglethat.com/?q=localized+supersonic+flow+over+a+supercritical+airfoil
@@agermannamedhans OK. I stand corrected and I'd better read up on this a bit more. You learn something every day.
Commercial airplanes like this A320 do not travel faster than the speed of sound, so this is not supersonic.
It's localized supersonic flow over the top of the airfoil. An aircraft doesn't have to travel at supersonic speeds to have localized supersonic flow over the top airfoil. air travels faster over the top airfoil due to its curviture. This accelerates the air, relative to the aircraft, to supersonic speeds, creating a pressure differential(shock wave) which creates the visual phenomenon pictured in the video.
+Patrick Canler Learn some fluids before you talk about things being supersonic or not....might want get a refund for that degree
+Vince savage lmao
Thank you
agermannamedhans Nice explanation also had the same doubt :)