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HAIFISCHHAUT für Flugzeuge! AeroNews

Nov 02, 2022

HAIFISCHHAUT für Flugzeuge! AeroNews

a Boeing Triple Seven, a huge long-haul plane, is now flying in a shark skin, what that means in detail and how it can take aviation one small or perhaps a little bigger step in the right direction, which we'll clear it up today, have fun with it and hello and a warm welcome. I hope you are well. This shark skin that is now attached to the fuselage of a Swiss Boeing Triple Seven is of course not a real shark skin, but a new surface structure that should or should have a positive influence on the fuel consumption of the aircraft is actually wrong because this surface structure, which is based on a shark skin, has been shown for a long time to reduce the fuel consumption of the aircraft because it reduces flow resistance and I would say we have a good understanding of what we are looking at now is part of fluid theory or fluid mechanics you remember familiarize yourself with the four forces acting on an aircraft in unaccelerated level flight lift and weight thrust and drag are balanced opposite forces we have exactly that unaccelerated level flight how much the greater this sag of drag, the greater must be the thrust on the opposite side In trying to keep our plane on the excursion d the horizon without accelerating, the greater the thrust arrow, the greater the thrust the engines must produce, so the higher the fuel consumption of the plane, it stands to reason that it would take a serious interest in this drag arrow. it is as small as possible in each phase of the flight this is also the reason why an airplane fuselage does not look like a brick because that would simply mean a lot of drag when flying and to be able to do that now you have to take a look at how the Airplane drag can also be done in different ways, but in aerodynamics it's common to break down total drag into induced drag and parasitic drag that a plane drags behind it and which are sometimes really visible when the air humidity is low. high. this is kind of an illustrated part of induced drag if a plane flies very slow and long story short it hangs very heavily in the air then it makes high induced drag if the plane flies fast and long story short it's really good in air, then the induced drag is comparatively low and the parasitic drag is all that remains.
haifischhaut f r flugzeuge aeronews
This is first of all the resistance of the form. A big truck is not as aerodynamic as the new Mercedes EQ and it is frictional drag the airflow that is in the boundary layer against an object moving through the air in our case the plane can be laminar or turbulent those are two terms to remember laminar air flows around the plane and over the wings so it means the airflow is really perfect in parallel layers that don't mix with each other at low speed above that slightly higher flow speed per on top of that it's a little bit faster until at some point the total flow rate of the free air around the aircraft reaches the outside the frictional resistance that occurs here on the surface is pretty low because the air isn't flowing very fast either and the layers also do not mix with each other in a turbulent boundary layer it is exactly the other way around here everything flows a bit chaotically mixed here also the velocity of the flow directly in the surface is 0 but the air is flowing over it because everything mixes wildly here it mixes much faster and the drag is much higher for the lowest possible drag so having airflow is desirable laminate around the aircraft and around the wings for as long as possible.
haifischhaut f r flugzeuge aeronews
For example, this is possible because the wings are built in such a way that the airflow runs laminar around the wing as permanently as possible and that ensures the least possible frictional resistance, but there is a problem, and that is that this laminar flow is very sensitive and very susceptible to disturbances that could disturb the laminar flow dirt on the wing for example Some kind of dirt and with some planes even just drops of water, just a wet wing that can disturb the laminar airflow so much that it just it becomes turbulent and then we no longer have laminar airflow but turbulent airflow with exactly the properties we just discussed surface finish is very important so how clean an aircraft is has a direct impact on the amount of fuel it uses or in other words a clean glider can sail better and farther than a dirty one but that also means great speed. and complex, but sometimes even a slightly dirty commercial plane cannot fly exclusively laminar, which is considered practically impossible, but that's not so bad after all, because a turbulent flow brings with it a very decisive advantage, to Know, because of all the movement of the in the Once it has passed the boundary layer, this turbulent flow has much more energy and therefore sticks much better to the surface around which it flows. in nature it becomes easier to control and it just becomes safer and this point is so important that you can even find small vortex generators on many airplanes, very small components that deliberately turn a really desirable laminar flow into a turbulent flow in certain points or over an entire wing, all control surfaces and the entire wing of the aircraft always fly safely without breaking loose, no matter what flight condition the machine is in, with the disadvantage that the aircraft loses energy in the air due to frictional drag and therefore consumes more fuel yes w We have heard a lot about how this fine little drop of drag builds up behind the plane so with this knowledge we can go ahead and explain how shark skin it reduces the drag on the plane but before i do that i can tell you this month like every month i recommend blinkist you know that Blin kist provides you with the top statements of over 5000 non-fiction books from 27 different categories and also the top statements of various podcasts condensed into around 15 minutes each to listen or read. there are links in german and english and if you want some book that you really liked, many of them are now also available as a complete audiobook directly in the blinkist app it's perfect, for example, when you go for a walk or while cooking or wherever you want to be told something in 15 minutes on any book on any topic and these 15 minutes are enough in most cases just to take some important thoughts some good ideas or something cool for everyday life with you and the app now it has another pretty cool feature namely blinkist Connect and that gives you the opportunity to fully invite your Blinkes.
haifischhaut f r flugzeuge aeronews
Free Premium Access ie sharing your free Blinkes Premium with someone very important, of course you keep your two Blinkist accounts which work completely independently ie now you can use Blinkes Connect twice for the price of 1 Book recommended titles to a friend Get recommendations and blings easily share them. I am happy that I was able to recommend blinkist to you over and over again for over a year. I really like using the app, that's why the link at the top of the Video description blinkes.de/aro News gives you a 25% discount on your annual subscription to blinkes Premium and you can use this link to test the app at its entirety for seven days with no restrictions and find out if it really blinkes is what you're looking for, thanks for the great support and have fun so now we know that a commercial aircraft is mostly surrounded by turbulent air currents, turbulence arises everywhere it is, ultimately only energy that is no longer available to the plane to clean the plane regularly so actually washing the plane which helps even though the surface is then not as rough for a short time the frictional resistance is reduced by a certain time but of course it is far from perfect and here you can learn something from nature again the surface of a shark is not smooth either, on the contrary it is full of a kind of flakes, all of which have a specific shape and have a specific function if you look at turbulent flow in three dimensions it becomes clear that turbulence occurs not only in the direction of the flow, of course, but rather chaotically in all directions, this is also the case for the shark when it moves through the water, but due to these minute grooves running parallel to the direction of the flow, this chaotic turbulence can be interrupted and thus reduced, and as we have just made clear, all the energy offered by the shark is not wasted and can be used to glide faster and more efficiently through the water and that should now be transferred to a plane yes and that really works a deliberately uneven surface is better than a perfectly smooth and in any case better than a dirty not perfectly smooth surface Going down by even 2% doesn't sound like much, but it's a really significant difference that could bring 100,000 dollars less CO2 emissions to the airline industry and 100,000 tons less CO2 emissions to the environment, but that has been known for a few decades. that's no secret, swimsuits that imitate this shark skin have existed for almost 20 years so that you can navigate better and more efficiently in the water at the Olympic Games now they are prohibited and why are not all the planes in the world filled with this shark skin because it is not so easy On the plane itself, this artificial shark skin must be able to withstand the huge temperature differences from the sun's rays and a wide variety of external influences must not quickly get dirty, then the effect would be there, it must not wear out too quickly, then it would not be worth the costly extra effort for maintenance and alignment.
haifischhaut f r flugzeuge aeronews
The direction of the grooves must exactly match the direction of flow at the respective point on the aircraft. You need to simulate this very precisely beforehand, because if it doesn't fit, you'd glue a rough surface to a smooth outer skin of the aircraft. , which then does nothing more than naturally increase frictional resistance and That, of course, would be silly, so many questions that have finally been largely answered by decades of research. Lufthansa Technik plays a really interesting role in this whole thing because they have tried this thing over and over again in the last couple of years with new processes, new approaches, new materials somehow to make it a cool product, they tested it on real planes, of so that they not only simulated on the computer but also sent planes into the air. and then they collected measured values, but repeatedly failed to really industrialize everything and into a really good product for airlines, until a few years ago, in cooperation with BASF, a product was created that was finally ready for series production because now people were no longer working with some weird shapes and some UV light here and there, but now you could make a really noteworthy amount of foil with the required structure and these grooves almost 50 micrometers high are printed over 1500 of these sheet parts then covered more than 500 square meters of the fuselage of a Lufthansa Boeing 747 which flew the test of the functionality of these panels and thus also the ea -sa approval collected now the product is actually ready for series production and must be used after the first in the eleven plus Boeing Triple Seven 300 ask Swiss with all Triple Seven then Luftha nsa Cargo can be used only on Swiss equipping Triple 7 sub-fleet to save more than 4,000 tons of kerosene per year that corresponds to about 87 round-trip flights from Zurich to Mumbai and that means more than 15,000 tons less kerosene emissions CO2 at the same time, that's not the world, but it's a small step in the right direction and a big step in the right direction because he knows maybe sometime there's a big step forward and sometime maybe no plane will roll without for an artificial shark to watch from Airbus or Boeing production stops, in that sense it should have been before the thanks for watching, I hope.
haifischhaut f r flugzeuge aeronews
I have it to some extent reasonably explained. I find it a very exciting topic and in detail also very interesting and then I hope that we will meet again very soon for a new video. I wish you a wonderful new week and then until next time, thank you. much and goodbye
haifischhaut f r flugzeuge aeronews
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