To those commenters below, ram jets, scram jets, pulse jets etc are not in the same family as these. This video concerns those engines that have axial flow compressors (there are some smaller jet engines that utilise centrifugal compressors) power turbines and drive shafts of which the aforementioned do not.
I had an argument with an instructor about jet fighters having turbojets...today most fighters have low-bypass turbo fan engines (since the 60's) of which the TF-30 is a first example (A-7A,F-14A, F-111), the TF-41 or Rolls Royce Spey used on the A-7D and E, Bucaneer and F-4 Phantom (UK).
Fighters have engines with low bypass ratios, so only 10% of the thrust comes from the bypass. Splitting hairs, but they are 90% jet. Whereas airliner engines are high bypass, and around 90% of the thrust comes from the bypass - so only 10% “jet”
The Russian engine manufacturers Kuznekov, Solo view powered many of the Russian airliners from the 1960s up till the 2010s until they were retired and scrapped
Fan is use to move air (and fast), propeller are use to create pulling force, while fan will make pulling force and propeller will make air flow for sure, it's not their main design focus. Also the compressor, which is build to pressurize air, but also would create airflow and some force on it if it's axial flow.
@@theaviator3863 it sorta ends up that way though, you should at least mention something about this being the majority but more exist, someone might think this is it and if they run into a different kind it'll cause a lot of confusion and they probably won't belive it, so practically the same as misinformation
so a jet engine starts by the hot air from the combustion chamber turning the turbines that is connected to a gear box which then turn the compressors? i need clarification
The hot air from the combustion chamber turns the turbines. These turbines turn a driveshaft (not gearbox). The compressors are connected to the driveshaft. Therefore the turbines drive the compressors via the driveshaft.
Former,turbo jet must use external power to drive turbines for starting then after combustion chamber burn fuel hot air drive turbine,remove external and engine will continue running until you shut off fuel,engine stop
Turbo fans and props aren't jet engines. In fact there isn't really any difference between a turboshaft and a turboprop. The Saab 340 plane and Black Hawk helo use the same engines, for example.
The biggest flaw in this explanation was saying that the fan in a turbofan is a propeller which provides most of the thrust- no, the fan is NOT a propeller. It's actually more of a compressor than anything else like the compressing fans in the turbojet core, the fan blows air through the ever narrowing bypass duct where it compresses as it's forced to squeeze through a tighter and tighter space. Once the bypass air reaches the back, it expands and accelerates out the bypass nozzle and that's how bypass produces thrust, much like the exhaust from the core. Pretty much all fighter planes also have turbofan engines and not pure turbojet engines which are nearly nonexistent nowadays. Other than that, it was a pretty good dumbed-down explanation.
Yes I appreciate that - but the videos are designed for those not as technically minded. And I think the wording was “acts like a propeller” - which in layman’s terms is close enough.
@@theaviator3863 I know the fan acts like a propeller but it doesn't produce thrust like a propeller. Many people think the fan is literally a propeller, thus they refer to turbofans as "propellers disguised as jet engines" as the claim that a turbofan is noting more than a turboprop whose propeller is encased in a shroud.
That's not really true. A fan isn't trying to compress the air per se, it's trying to accelerate it - just like a prop. Although inevitably acceleration is achieved by applying pressure - so it's the same thing. The bypass ducts narrows not because it's trying to increase the pressure like a nozzle, rather because the speed of the air has increased therefore the same mass will exit out of a smaller hole than it entered.
There are more than 4 types of jet engines. Not a word about radial, only axial flow? Also any fighters have low bypass turbofans. What about ramjets, scramjets, pulsejets, motorjets? Turboprops and turboshafts are not types of jet engines, but applications of turbojets. A wasted opportunity to educate people properly.
To answer your points: I mention “Compressors” in the video. Yes, whilst the diagrams show axial flow engines, Radial compressors are still compressors - so makes little difference to the content. Modern fighters do indeed have low bypass turbofans - but aircraft such as the lightning operate with turbojets. The Avon engine was an axial flow turbojet. 2 reasons for not mentioning ramjets etc. Firstly, the video is already over 7 minutes long. My stats show that people tend not to watch videos that are much longer than that. Secondly, with the exception of missiles, some drones and experimental aircraft etc, they aren’t wildly used or in mainstream use. I correct you on your comment on Turboprop and Turboshaft engines. They are considered as a separate type of engine. The similarity with them all is the gas generator - but they are classed as separate engine types.
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Awesome briefly explained thank u sir 👍
To those commenters below, ram jets, scram jets, pulse jets etc are not in the same family as these. This video concerns those engines that have axial flow compressors (there are some smaller jet engines that utilise centrifugal compressors) power turbines and drive shafts of which the aforementioned do not.
ram jets scram jets are by definition jet engines ... turbo prop and turboshaft engines are not perhaps rename .. how many gas turbine engines. ?
@@ianalbiston9069 Correct. This video describes gas turbine engines, not jet engines.
I had an argument with an instructor about jet fighters having turbojets...today most fighters have low-bypass turbo fan engines (since the 60's) of which the TF-30 is a first example (A-7A,F-14A, F-111), the TF-41 or Rolls Royce Spey used on the A-7D and E, Bucaneer and F-4 Phantom (UK).
Fighters have engines with low bypass ratios, so only 10% of the thrust comes from the bypass. Splitting hairs, but they are 90% jet. Whereas airliner engines are high bypass, and around 90% of the thrust comes from the bypass - so only 10% “jet”
@@theaviator3863 but still tutbofans.
Very clear explanation
so nice video
This is also
pulsejet
turbo ramjet (SR-71)
scramjet
ramjet
electric turbo jet
But not in regular service.
@Vishal p
Those ram jets are especially funky because they're solid fuel ramjets instead of liquid fuel.
Would how many types of gas turbine engine are there be a more suitable title I wonder.
The Russian engine manufacturers Kuznekov, Solo view powered many of the Russian airliners from the 1960s up till the 2010s until they were retired and scrapped
There is the scramjet!
So, mathematically speaking, modern "jet" airliners are essentially propeller driven?
Fan is use to move air (and fast), propeller are use to create pulling force, while fan will make pulling force and propeller will make air flow for sure, it's not their main design focus.
Also the compressor, which is build to pressurize air, but also would create airflow and some force on it if it's axial flow.
I wouldn't go that far but a modern jet engine is kind of like about 80% turboprop and 20% turbo jet.
You forget...
(5) low-bypass afterburning turbofan
Gotta love misinformation, so many other types of Jet Engines totally ignored in this video
Omitting engines that are not generally used on aircraft isn’t misinformation.
@@theaviator3863 it sorta ends up that way though, you should at least mention something about this being the majority but more exist, someone might think this is it and if they run into a different kind it'll cause a lot of confusion and they probably won't belive it, so practically the same as misinformation
so a jet engine starts by the hot air from the combustion chamber turning the turbines that is connected to a gear box which then turn the compressors? i need clarification
The hot air from the combustion chamber turns the turbines. These turbines turn a driveshaft (not gearbox). The compressors are connected to the driveshaft. Therefore the turbines drive the compressors via the driveshaft.
Former,turbo jet must use external power to drive turbines for starting then after combustion chamber burn fuel hot air drive turbine,remove external and engine will continue running until you shut off fuel,engine stop
Turbo fans and props aren't jet engines. In fact there isn't really any difference between a turboshaft and a turboprop. The Saab 340 plane and Black Hawk helo use the same engines, for example.
as with every engine there are only two types: .working or not working!
Cool👌👌👍👍🙏🙏
What about terboram
A turboprop isnt a jet ;-;
@@ture2588 No it isn't. It's a gas turbine engine.
The biggest flaw in this explanation was saying that the fan in a turbofan is a propeller which provides most of the thrust- no, the fan is NOT a propeller. It's actually more of a compressor than anything else like the compressing fans in the turbojet core, the fan blows air through the ever narrowing bypass duct where it compresses as it's forced to squeeze through a tighter and tighter space. Once the bypass air reaches the back, it expands and accelerates out the bypass nozzle and that's how bypass produces thrust, much like the exhaust from the core. Pretty much all fighter planes also have turbofan engines and not pure turbojet engines which are nearly nonexistent nowadays.
Other than that, it was a pretty good dumbed-down explanation.
Yes I appreciate that - but the videos are designed for those not as technically minded. And I think the wording was “acts like a propeller” - which in layman’s terms is close enough.
@@theaviator3863 I know the fan acts like a propeller but it doesn't produce thrust like a propeller. Many people think the fan is literally a propeller, thus they refer to turbofans as "propellers disguised as jet engines" as the claim that a turbofan is noting more than a turboprop whose propeller is encased in a shroud.
In Layman’s terms, it’s good enough.
@@theaviator3863 I know
That's not really true. A fan isn't trying to compress the air per se, it's trying to accelerate it - just like a prop. Although inevitably acceleration is achieved by applying pressure - so it's the same thing. The bypass ducts narrows not because it's trying to increase the pressure like a nozzle, rather because the speed of the air has increased therefore the same mass will exit out of a smaller hole than it entered.
Can i correct you? Well... you didn't explain all the engines, you missed "scramjet" "Ramjet" and "turbo-state reactor"
None of which are in service. Scramjet and turbo-state reactors are theoretical.
@@theaviator3863 true... but i did'nt know this was a video about in-service engines. Also, great video.
@@theaviator3863 ah also, they are not theorical, scramjet and ramjet are used on ipersonic drones and nuclear missiles, for example.
Facts
Also pulsejet (used in some air RC models)
turbo ramjet (SR-71)
electric turbo jet (electric motor drives compressor)
I hate fake computer voices. Can't watch the video srry, I'm out
I am glad you felt the need to tell me that.
There are more than 4 types of jet engines. Not a word about radial, only axial flow? Also any fighters have low bypass turbofans. What about ramjets, scramjets, pulsejets, motorjets?
Turboprops and turboshafts are not types of jet engines, but applications of turbojets.
A wasted opportunity to educate people properly.
To answer your points:
I mention “Compressors” in the video. Yes, whilst the diagrams show axial flow engines, Radial compressors are still compressors - so makes little difference to the content.
Modern fighters do indeed have low bypass turbofans - but aircraft such as the lightning operate with turbojets. The Avon engine was an axial flow turbojet.
2 reasons for not mentioning ramjets etc. Firstly, the video is already over 7 minutes long. My stats show that people tend not to watch videos that are much longer than that. Secondly, with the exception of missiles, some drones and experimental aircraft etc, they aren’t wildly used or in mainstream use.
I correct you on your comment on Turboprop and Turboshaft engines. They are considered as a separate type of engine. The similarity with them all is the gas generator - but they are classed as separate engine types.