This video is more awesome than people may realize. This video captures the following visual information I have not seen in other videos. First, it shows clearly how the air flow volume is actually only a thin cylinder around the spinning fans. Most pepole don't realize that air hitting the engine does not go through the engine even close to the center. Second, it shows how this particular kind of engine has not one but two coaxial counter-rotating shafts. Three, it clearly shows the angle of the compressor blades (I mean the moving blades) and the stator blades (the fixed position blades along the outside). Fourth, the second and third features combined allow you to imagine how the air flows from the forward exterior fan, gets pushed through and will start spiralling, and the *spiral* flow from the front engine fan then meets the first row (part of first stage?) of compressor blades at a *low* angle of attack (the blades are efficiently moving through spiraling air like a wing). I always wondered how the blades were not acting like a wall pushing air. It's because the air coming at them is spiraling and not racing straight in. This reduces the angle of attack, so the compressor blades don't create turbulence (or stall). Then you can imagine (yes, you need to imagine) how the first row of blades starts reducing the spiral flow, so the next row of blades needs to be angled to face more of an axial than spiral flow. This continues through the compressor stage. The video does fail to mention there are two stages (or three? if you count the front blade?). From what I call the first stage, the air still has some spiral motion, and the second stage of blades then rotates in the opposite direction from the first, allowing the blades (like before) to meet the air with less angle of attack. This allows for reduced turbulence/stalling while allowing the blades to do more work. Again, the fans have less and less angle as you go from front to back. All while this is happening, look how very little space the air is moving through. It gets smaller! Now, an engine working at a steady speed always has a steady amount of air mass moving through it (lets say pounds per minute). Each slice of the engine has the same flow rate. Where I pointed out the cylinder gets smaller, the mass moving through has less space, so it must be more dense. That means it *must* be at higher pressure (unless you could magically cool it to reduce the pressure). So, you see the air must be flowing through at higher and higher pressure. Then, when it gets past the second stage (second set of fans), the flow is allowed to expand where it meets the fuel. NORMALLY, expanding air flow reduces the pressure. However, the fuel is ignited at the expansion point. The heat is just like an explosion - it prevents the pressure from dropping. So, you go from a narrow, high-pressure flow to an expanded area with similar pressure. Note - the pressure is NOT greater in the combustion chamber than right upflow. If it were, the flames would move forward. No, the pressure actually DROPS in the expanded flow in the combustion chamber but not much. However, although pressure keeps dropping from final compressor fans to combustion, the ENERGY/work put into the air dramatically increases due to the burning fuel that is preventing the pressure drop in the expanding flow volume. Then, this air is once again squeezed through a narrowing opening, speeding it up and meeting the exit stage of the turbine. (I don't know the terminology.) I may sound rambling, but my point is - I have not seen a video that allows you to see the moving parts this way. I am especially stunned I did not know (a) how narrow the air flow cylinder is and (b) that the engine has counter-rotating shafts, one poking through the other. Cool!
@@vagabond630 this man just spent the good part of a day detailing his opinion on this, and you ask HIM why there are turbines? Watch the video dumbass
@@untrust2033 fuck you man, I wanted to know If there are turbines, won't there be energy loss? The velocity of the gas ejecting out would be reduced. But then again is the thrust actually produced by the exhaust? or the thrust is actually produced by the fan sucking in the bypass air and this fan is powered by the turbines?
Very cool. I didn't know the blades turn in opposing directions... I've seen these engines in museums cut open to see inside, but I couldn't figure out how the things don't just shoot flame out of both ends!
This is all amazing, but I still also love even more watching a simple afterburner take-off and feeling it rattle my bones! :-D Well, I guess I can't do that anymore. I only served a brief time and I am not near SR-71s or other AB-equipped jets that are taking off. (OK, nobody is near SRs taking off anymore, but one time I had a single privilege of witnessing that.)
@@BrunoBoy3913 - I saw mine at Beale. I was with a small summer contingent of USAFA cadets that stayed there a couple of days. Operation CONUS was the name of the program I was in. Small groups of cadets were sent to tour various groups of three bases for two weeks. My group was Beale, McClellan, and Travis. (A few years later I ended up serving at Travis as a lieutenant in the Travis 22nd AF Ops center Weather Support Unit, plus doing flight line wx briefs and forecasting). I remember touring the Beale maintenance facilities and one airman animatedly expressing his passionate hate about how often his uniform got wet from all of the leaking fuel and hydraulics, plus all the laundering required! That was kind of funny. He and some others were not fond of the Marysville area. What did they want, New York City? That's life in the AF for most people. So, we got to see a daytime takeoff of a U2 and a takeoff of a Blackbird, plus a sit in the simulator - but it was off and a few things were covered up. The sim was cool and lame at the same time. Us cadets were a little bummed, as we had heard from others how they were given flights in F-15s or at least cool sim rides at their respective bases. We ended up riding in KC-135 that refueled a Blackbird. We each joined the boom operator for a bit. That was a special treat. How many people get to do that? I think the ride doubled up refueling F-16s as well, or maybe that was another tanker ride. It is still amazing (to anyone not in a coma) how superior the Blackbird was to anything else that ever flew high and fast.
So lemme get this straight, a Jet engine is basically a recoilless rifle and a turbo conjoined to make continuous combustion a reality. I thought these engines were much more complicated than regular combustion engines but it seems I was wrong; they seem much simpler than a regular car/truck engine!
Yeah, they're really not conceptually complicated. The difficulties in the development of the jet engine were more about the comparatively advanced material science and manufacturing side.
@@nicholasaquino5160 Yeah flying an aircraft does not mean you know a jet engine, with all due respect. I work for GE and have worked for CFM / Safran in the past. here is a tip : noise leads to vibrations and losses making engine inefficient. in lay man's term. An old inefficient engine would make noise.
The most efficient engine is one that spits out a stream of air at almost the same velocity of the external airstream. So if your plane flies at 560 mph, a high bypass engine will dump air out the back at just below the speed of sound.
Impressive stuff, but let's forever remember that without Sir Frank Whittle, English inventor of the jet engine, none of this would be possible. As an Air Commodore, the RAF will be forever proud of Frank.
kinda like in your car where air comes in the where the spark plugs spark and gas is sprayed as a mini bomb make the pistons move up and down thats the thrust to push and make camshift go
Viewers out their i would like to know the program used to come up with the animations in this video clip, I will be grateful from your positive response.
I would like to understand : how axes are interconnectet / or not ? Which turbin moves the fan ? Why the last turbin is spining in opposite direction of the big fan ?
Johannesburg South Africa was Nyce Munich Germany was Nyce London UK was Nyce Air Canada Number 1 thank you too the Pilots that got us their and Back. #impressed
The animation is great, but one statement in the video is vague if not incorrect. The high pressure air from the compressor section does not "meet a flame." Fuel is injected into the high pressure air stream entering the combustor, and then the mixture is ignited. The resultant expansion of the mixture due to the heat of combustion exits the rear of the engine at high speed.
I actually worked there for a year and a half in the late 70s on the assembly floor. 3 generations of my family retired from there. I didn’t like factory work and moved to Alaska.
The animation suggests air takes a helical path through each stage but reverses through each successive stage. Why is that, counterspin that reduces torsion?
Good evening, I hope you’re having a nice day. Firstly, I would like to thank you for your great effort and useful videos. Secondly, I wanted to have your approval to use some of your videos on my daily motion channel if you wouldn’t mind. Thanks in advance and sorry for the inconvenience. Abbas Mahmoud. Content Creator.
Nice animation, good presentation. The narration was lost to me at, "a kind of super gasoline"! Hello!! It is kerosene! Jet-A1 is kerosene with all of the corrosive elements removed, ie: Sulphur, amongst others. You can run a jet engine on gasoline, but that would be economically stupid, it will run on diesel, but diesel is very rough -- a fuel that is much closer to it's fossil origins. I don't know a tech that will go up in the aircraft fueled with diesel.
