Combustor Liners 3 - Turbine Engines : A Closer Look

[Bobkse]

Why are the igniter holes so close to each other in the annular combustor?

[AgentJayZ]

@Bobkse You only need one, and the other is just a backup.

[Pyanities]

A very interesting report on the development of various combustion chambers. - Can - Combustors, tube - annular combustors and finally annular combustion chamber as in history. I have never in my life seen before these parts so close and well explained. Thank you :)

[bf1942acepilot]

shop kitty ftw!

[circe362]

At about 8 mins into the video, you show a neat liner with 30 some burners. Are the swirlers all the same direction?

[AgentJayZ]

@circe362 I think so, but I didn't look any closer than in the video. And it's in the engine now...

[MoowChair]

They seem to be made of very thin metal. I guess they don't have to stand very big pressure differences?

[AgentJayZ]

@MoowChair The pressure difference between the outside of the combustor liner and the inside is very small; just enough for the air to flow inwards through all those holes.

The main stress on the liner is heat radiated from the flame of the burning fuel.

[gcoochy]

I used to make the annular combustors for the RB199 in the Panavia Tornado

[zero00tolerance]

Awww the cat is sooo cute !!!!!

[madisonelectronic]

The blade patterns look like visual representations of the general solution to differential equations. It sounds just the same as until supercomputers many differential equations were unsolvable, at least in any fashion other than trial and error.

[Nosforit]

Kitty!

[scubaskybisk]

Thanks for the video!

[gcoochy]

Amazing site, I work for Rolls-Royce and used to make the anular comdustors for the Panavia Tornado, the RB199 turbojet, I was the main Quality inspector. In now make the large fan blades for all the Trent series engines, very big fan blades

[MrBranboom]

You're so awesome!

[milesall1]

it be neat to rig up a smaller combuster liner (can )with diffused compressed air and propane gas, filmed in lowish light to see exactly what the flame pattern is and how exactly they work, im sure your viewers would be very interested to see, getting the volume of air would be the problem, but i reckon the start cart would have no problems. hint hint.

[AgentJayZ]

@milesall1 Out in the open like that, the holes in the liner would allow air to flow out, when in an engine air flows from the outside of the liner inwards. Your demo would be ultra cool if we could somehow make a combustor case out of glass so we could see inside a real running engine...

Hmmmm....

[milesall1]

@AgentJayZ quick connect coupling compatible with your start cart hose - reduction cone to a fabricated 316 stainless rolled tube with diameter about 2-3 inches larger than the diameter of the combuster can, with the end flared or flanged to the OD of the can and tacked tig welded, gas supply to injector nozzle simply controlled by ball valve to achieve fuel air ratio., mounting bracket to bolt to your test stand, you already have propane there, max tube size is 6" or go to light wall pipe 316SS

[86Ivar]

Nice video! Do you know if the annular 500000 buck combustion liner is so expensive due to an advanced production process, or for all the testing and development?

[AgentJayZ]

@86Ivar I think both, and they aren't made in large numbers, so economies of scale are not achieved.

And I'll bet the tooling to make them is phenomenally expensive.

Sure, it looks like a few rings made of thick sheet metal, scrunched into wavy patterns, welded together, drilled for ventilation, and then coated with ceramics.... but it all has to be dimensionally correct to within a few thousandths of an inch in every direction... that's "perfect" to us mere mortals...

[sirtom68]

500,000 frog pelts for an annular combustor? I work at Acme Asteroid Mining and even I cant afford that !

[vrsca89]

Hi Jay, I would love to see more of the JFS100

[somuch721243]

half a million dollar only for old combustion chamber?

[oddballlw]

The J75 is my favorite... Very cool design!

[nsemergey]

I am simply shocked by this annular combustor. At last the real modern thing in the shop! All that cans from the older engines look sort of toyish :)

[bernardvg]

This is so much better than reading my textbooks.

[crazyrum]

Thanks! Great video!

[egn83b]

so does this mean turbine engines operate sort of like a sterling engine with a heated air expansion chamber?

[AgentJayZ]

@egn83b I don't know what makes a sterling engine work, but I think it works on the Sterling cycle... ?

A piston engine works on the Otto cycle, and a gas turbine works on the Brayton cycle.

These things, descriptions of, of me, ask you not... of you , in advance, thank, do I.

[mobius1aic]

FUCK YES ANOTHER AGENTJAYZ VIDEO! IT'S MY LUCKY DAY!!!!!

[TheMan1510]

What type of metal are these liners made of? They seem fairly fragile.

[AgentJayZ]

@TheMan1510 A cmbination of stainless steel for toughness and resistance to cracking, and refractory alloys like Inconel or Hastelloy for maintaining strength at very high temperatures.

They live in an environment of 1000mph wind at a temp of roughly 1000F, so they are built to be as far from fragile as possible.

[matube73]

Another great vid Jay. Excellent close ups. Question please:- What feeds all of them mixing holes to cool the burnt gases in the combusters? Is it from airflow around then engine?  How does this work in a fighter jet set up? Cheers.

[Reisi81]

@matube73 It's all the same airflow coming from compressor. As you can see in video, only small part of it "is burned", larger part is squeesed through combuster liners later, which cools the exhaust gases, but all air comes from compressor. If I'm wrong, blame JayZ :D

[matube73]

@Reisi81 Got it. Cheers.

[AgentJayZ]

@Reisi81 I endorse this answer :)

[kurtnelle]

Man, you're getting better at these videos. I learn more in each subsequent video that I learned in the video before it. Keep this up and my head will explode.

[117nathanmyers]

there is no need for a dislike button. Great video

[mytmousemalibu]

That was neat jay! Question, do the full annular designs still have a turbine inlet guide vane yes?

[AgentJayZ]

@mytmousemalibu Yes, the turbine inlet nozzles direct hot combustion gases at the turbine. Whatever it is that makes those gases it not something the nozzles worry about.

[blobusus]

I assume that last one was an LM2500?

[AgentJayZ]

@blobusus Yes. I responded to this comment earlier via mobile, but it apparently was sent to another dimension !

[MrWarwick15]

Thanks for that Jay!

Rich.

[motormouser]

Very informative...keep up the great work,i look forward to your videos very much.Thanks very much

Merry Christmas...Bob

[SmokedTails]

Woah, that CF-6 combustor is pretty sweet. The J-75 can-annular one is also quite interesting. Thanks for the videos!

[JayJr2007]

Great video.

[peternut1]

I'm really enjoying your videos. Wow.... 1/2 Million for that thing. Keep up the super videos!

[andysim232]

i learned more in 10 mins than 2 days of class hehe.

[RobsterJay]

Thanks for the vids, very informative.. fascinating stuff! :)

[HIGGI6]

Great overlook of the different designs. The inner combustor liner of JFS-100 looks preatty simmilar to the ones we use in our small gas turbines (ring of fire :-)). I`d love to have one of those old J-79 combustor liners - they look so cool.

Really interseting video - thx for showing.

[465maltbie]

Any Idea how those are welded together? I tried to modify one several years ago and it cracked at every weld.  I was welding with inconel wire using argon shielding gas. This was for a test project at one of our universities so I dont know which model it was.

Charles

[AgentJayZ]

@465maltbie Inconel and other refractory alloys like hast-X... are extremely difficult to weld.

[WolfenGeist]

This was a GREAT lessons,thank you very much Jay!

[Blackmoonempire]

Very important, that every combustor liner is "Shop Kitty- Approved" :)