Working in the gas turbine industry. You may want to put a small shield around the rotating hardware. Because, I really want to see more of these and that would be hard without the guys that did it. Awesome video guys.
I was thinking to myself I don't know how they didn't do the iconic "have I been shot" torso pat down. Because that was a lot of kinetic energy those pieces of metal flying apart had.
Im not even going to lie, I thought this was going to be the worlds hottest BBQ lol. I love the high vis jackets though, so the chunks of super sonic turbine blades can see you in the dark.
Thank you , to my untrained eye, that thing becomes a jet engine, you just have the limited amount of fuel in the burn chamber. Absolutely amazing build, I loved seeing it! Did you say bigger and twin turbos to come?
Yes that is correct! We are actually doing another test run with a single large turbo today to make sure our door can handle it, then we move into twin turbo buil
the complete lack of fuel and boost control means that these things will just continue to spool as long as they have fuel. meaning i cant see them not exploding. if you had a way to shut off air remotely you would be able to throttle it to a sustainable level. otherwise the turbo is just going to keep spooling up until you exceed the tourque limits of the shaft. which is what it looks like happened here. the power being transmitted from the exhaust wheel to the compressor wheel snapped the shaft. if it has some kind of boost controler, you could have yourself a wood fired gas turbine.
turbos do not produce a lot of torque. that turbo makes at Max 50 to 100lb-ft of torque. no where near enough to break the shaft. they blew this turbo because they are hilljack morons who over speed it till it exploded the turbine wheel. they likely over temped it too.
@@cbrunnem6102 may be true in this case, but not always true. i work with turbos that are rated to 2500 shaft hp. admittedly they rocket engine turbo pumps. but thats more or less what this is, a self feeding, zero cut off infinitly cascading turbine. its going to keep building until it fails or runs out of fuel. and they can indeed build up so much boost they break their shaft. compressing air takes a lot of power.
@@jondepinet John would a large external Wastegate plumbed between the combustion chamber and exhaust housing be effective at controlling boost? Or be better off controlling the air feeding out of the compressor and into the combustion chamber? I'm very keen to build one. I'm a pressure welder and car nut and quite keen to build one but dont want to blow it up every time I fire it up.
4:38 Idk why but i love the fact that it changes the high pitched annoying whine for a Deeper, Angrier and Strong whine at full speed. That thing just Screams POWER an i love it.
What a cracking experiment, interesting concept. I would say the turbo failed and not your idea. Need to fit a boost gauge to see what pressure it was building before it let go. Yeah, I will definitely watch more of this. Thanks for some fresh footage.
You need to have two-stage combustion (i.e. gasifier-combustor) to avoid throwing hot char into the turbo that will damage it in minutes. Even if you control the turbine speed by controlling air flow, you will end up with badly corroded turbine wheel in the first run. See my 2008 project (in my RU-vid channel) with downdraft gasifier along with cyclone gas cleaning and cyclone combustor. I used smaller turbo (TD05) and generated 1 kw electricity using second stage (holset) turbo
I feel like the gasifier ruins the simplicity. There has to be a way to filter or inertialy separate the char. Either cyclone separator or a coaxial tube with the compressor outlet outside the turbine return. Then maybe cooling air could be circulated back as well, cause imma guess heat was a problem. I just would try everything I could before trying to do a gasifier.
@@astronichols1900 Adding a series of vertical baffles (first coming from top, second coming from bottom, third from top, etc.) will eliminate large char. Then, can have one bypass tube at the compressor outlet directly connecting the compressor to the turbine (preferably passing through the main shell to heat air) while an air valve can be added to the main air supply at the combustor inlet to control turbine speed and temperature. Closing the valve partially will reduce air to the combustor forcing air through the bypass. Turbine inlet temperature should be always below 900 degree C.
I would use 2 combustion chambers, piped like a modern high-bypass jet engine. Only a small amount of the boost air goes into the fuel chamber to keep the fire hot. The rest of it goes to a second chamber, where the fuel-rich gases are gradually mixed with the remaining air over a baffle so that they are cleanly consumed before being diluted to a lean mixture that will avoid overheating the turbo. This second pipe could quite easily double as a cyclone separator to throw out any large debris back into the 1st chamber. Also, am I seeing this correctly that the oil overflow from the turbo was piped back into the combustion chamber? You've basically guaranteed a fuel-rich runaway doing that. The excess oil should go to a cooler and filter, then get reused.
Reminds me of the Monty Python and the Holy Grail scene, "run away, run away!" "We need a bigger turbo", ahahaha, yeah that's the solution. With no boost control, that's what you call a positive feedback loop, with the sole limitation on infinite power being the fuel supply and rotational speed limits on the turbo. I don't blame them for getting away from it. And that was totally epic! :)
When that bugger became self-sustaining and the revs soared, that's exactly what I was thinking! 😆 "Run away! Run away!" ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-YWTJ8iZr7ro.html&ab_channel=SunBunz
Egt too high but thats alright, it needs a wastegate. Run 40psi, cummins isx usually run around 38 psi so 40 should be fine, 60 would be pushing it and it was probably pushing 200 psi in this video hahah
I wonder what would happen with a water injection system upstream of the exhaust turbine? Spay in enough water too keep the EGT around 500-600C. Not only will that avoid slagging the turbo but it would actually give *more* volume to power things with. The downside is that it would require a long enough manifold to fully vaporize the water or risk eroding things.
@@benjaminshropshire2900 I reckon the water would either shut it down or blow it up immediately depending on if the exhaust is hot enough to vaporise all of it. If it is hot enough it'll be too much steam or not enough cooling. Plus they'd need a high pressure pump and some way to make sure the injection nozzle doesnt get blocked or melt on startup.
@@Patrick-zr8tv I suspect the pressure needed wouldn't be that high: the bucket doesn't look like it would hold more than a few hundred psi anyway. Mostly it will depend on the nozzle choice. Even then a pressure washer would be more than enough. As for how much water to pump in; I was thinking of some kind of closed loop control using a temperature sensor to regulate the EGT. And I don't think too much water shutting down the fire would be a risk as long as the injectors are after the fire box.
@@shaneintegra a wastegate is a pressure release for the hot side on a turbo and the main idea is to release pressure to stop the turbine from spinning faster thus controlling the pressure
Great video! I think you should try a closed loop oiling system next time. Because this system simply has too much back pressure from the burn barrel preventing it from working well.
You do realise that you have a redhot(read: 750 deg C plus) mild steel( read: not reliable above 450deg C) combustion chamber that is sitting at 200 to 300 kPa with flammable gases!...wood gas that effectively consist of carbon monoxide and hydrogen ! Scrapnel from the failing turbo might be the least of of your worries ! ... but still very cool project, but don't injure yourselves or worse maybe consider incorporating some industrial burst panels to direct the "woof" when the dog want's to bark!
@@vlakkieaarde I couldn't of said it better. The way that thing is heating up its about a minute or so from becoming a really bad day for all around it. At the least they need some blast panials and maybe even some stronger steel and some hi heat bolts. That 4mm door is way to thin. The best case sanaro was the turbo blowing. It really needs some kind of pop off for the extreme pressure buildup also. I think your observations were spot on.
Power steering pumps make great oil pumps, that's what I used powered by a furnace fan motor with a tank and T fitting bypass valve to regulate pressure.
I was watching without sound half way through...though this was a very fast and hot BBQ grill and I assumed "the rectangular door" was the flat grill top part...I was definitely wrong....when I replayed the video with sound I understood that it wasn't a grill at all....yet .. Great job everyone. Keep up the recycling of parts. Could you use old crankcase oil as a turbo lube then feed to an injector or atomizer nozzle within the burn chamber.? That way the heat from the bearings will be partially cooled thus thinning the oil with heat . Thin copper tubing could also be traced around the exterior of the bearing housing to collect more heat ...then finely sprayed into the "Super Combuster "
@@rearspeaker6364 I think that's part of the reason it failed. The pressure within the chamber would have been pushing back up the drain. Not allowing it to lube properly.
You can try the top end air inlet to the combustion chamber, this will increase the depth of combustion of the fuel and reduce smoke and temperature at the top plate and at the outlet. Great job, fly safe!
This is the same concept of a diesel engine running out of control. It will continue ramping up until some part or parts crucial to maintaining the pressure fails. Needs a wastegate at the very least to not basically be a bomb.
When the first line is the best bro .. basically it started with " I was drinking one night with the buddies around campfire night. And this was created "
Well.. that was something different! I've usually thought already about random things I see people doing but not this one. So much potential. Personally I'd go with a much thicker pressure vessel and one with a quick-lock door, much like in a submarine. Perhaps such things can be found in the food processing industry? Just nuts though. Keep videos coming!
Looks fun! Just a thought, looks like oil return is connected to the burn chamber.. wouldnt pressure in here on full chat be higher than the oil feed, thus pushing the oil back or restricting flow, starving the turbo?
@@So-Flo indeed, we had a honda cr-v in last week for a turbo replacement, snapped shaft. Turns out the oil hadnt been changed in 80k miles, alas none of the thick black gunge was getting to the turbo bearings!
It absolutely will 100 % I only know this cause an engine with excessive blow by will do the exact same thing or cause a huge pile leak in the turbo housing which also starves the shaft of oil
Needs some kind of pipes internal to the burn chamber with a lot of holes drilled in that connect to the intake and exhaust. One to diffuse the intake air a bit better, and the other to help screen out any possible debris. Turbo might last a little longer with those things added and some kind of rudimentary throttling mechanism. Also try and figure out if it's possible to do something interesting with the bleed air on the compressor side, maybe spin another turbine connected to a small generator or something goofy like that.
What in cousin f'ing tarnation?? 🤣 that was beautiful, well done! Please don't blow yourself up building V2 though... and you may consider some ties going to the center of the flat door.
This is a project I've wanted to embark on for a while actually. Do you have anything covering your combustion chamber design? Controlling gas velocity inside the combustion chamber would go a long way to helping prevent so much particulate matter going through the turbine. Fuel air mixture is probably not ideal either. The next progression, that I really want to try is a twin turbo system that runs off a gasifier. Both turbos fed by the same exhaust, but one compressor is drawing wood gas, the other fresh air and that is combined in the combustion chamber.
That's a pretty good idea actually. You'd almost certainly need the bigger turbo drawing the wood gas (due to the restriction of the gasifier and all the fuel you'd need to draw through), and then a smaller one to drive the combustion chamber.
@@raelik777 I've done a fair amount of the math and by the time you count all the restriction of the gasifier, you can make up for it with filtration/restriction on the clean air side. Woodgas needs to be somewhere around 1:1 afr, so two identically sized turbos should be perfect, then balance the turbo output with throttle plates on the inlet side. I have been eying up the turbos off the nissan twin turbo 300zx. Little tiny things that they are, would be perfect for a test rig. Just can't afford to build a gasifier and turbine setup.
Fantastic build, very well done! Luckily the Turbo failed before the entire device turned into a bomb that even Osama would have been proud of. A daytime run would look amazing with all that smoke, even Greta would come running to see what all the fuss was about!
@@escapetheeveryday do you think you could put a pressure safety valve on there? Don't know where you could get one that could withstand the heat but I think that'd be youre best bet if the boost suddenly spikes before you can react.
@@nickmiroli It'd probably jam with all the debris. Either open or closed. Ideally open. Also you would need a computer of some kind and some kind of pressure feed, both of which would be a bit too complex to justify I think.
@@Patrick-zr8tv you can angle it so it wouldn't catch debris if anything. Also there are lots of wastegates that operate on spring tension and vacuum. No electronics needed.
what happened is a self-sustaining chain reaction. where the turbo will accelerate until it explodes (unless its rotation is controlled by the air intake, as solid fuels have no burning control). that's the problem with rocket engines. once the reaction starts, it will occur at its maximum potency. basically you created a reaction engine, a turbojet, with a brayton cycle.
Fantastic, just needs a waste gate! From the looks of it the waste oil goes in to the burner? Great idea, I wonder if it could be self sustaining just on the oil... I reckon over pressure along with a piece of 'fuel' being ingested is what blew the turbo.
Very self-sustaining. That's the basis of what happens when a diesel engine goes into runaway, an oil seal failure allows the intake spool to atomize the oil and the diesel engine happily consumes it as fast as it can go. A diesel in runaway will continue to accelerate until it blows apart, or all of the fuel is gone. The only way to stop this is to smother it, block the air inlet.
That was very cool ! Appears to have gone into runaway mode on you or it sucked something from burn chamber into it. For sure needs some way to bleed off pressure lol
Well there’s no active control, and it’s a positive feedback loop, so it’s either damped so much that it can’t self sustain (below critical rpm) or it is running away unless som other damping comes into effect to limit rpm increase
Possible modifications for future iterations: Wastegated turbo (ball bearing?) - might act to self-regulate system pressure and therefore shaft speed Dump valve on the compressor pipe - let you use chamber pressure rather than compressed air directly to the compressor to spool up, while free-wheeling the turbo, then once it has some speed, route discharge air into the combustion chamber and shut off starting air. Double-wall and/or stiffening ribs on the access door. Or use a plug-type door of the kind used for service doors on liquid tanks, mounted on the side so it isn't directly exposed to the heat of the fire as when mounted above. Just spitballin...
Here's a fun thought. Let's pretend the only fire buckets I know about are the kind used for putting fires out and not starting them, and then explain what this thing is and why it needs to be turbo charged.
Could you guys give a technical explanation on how that system works? I can’t seem to wrap my head around how the turbo is able to keep spoiling without outside air.
They blow fresh compressed air in,fanning the fuel, until hot exhaust gas pressure is enough to turn turbo, becoming self sustaining. The outside air is coming in where he is blowing the compressed air. (Front of turbo)
I think, the pressure the turbo does is higher compared to the pressure of the exhaust gas from the drum (but not the amount). Thats makes the turbo put air into the chamber while exhaust gas is driving the turbo at the same time. Therefore it seems like a perpetuum mobile but its not, because it consumes fuel.
Holy CRAP! That's the coolest grill I've ever seen. You got 20lbs of chicken, 4 racks of ribs, 30 pork chops and half a cow? Gimme 4 minutes and I hope you like it all well done. You brought the beers, right? 'Cause we're gonna need a keg after we're done picking the shrapnel out of the meat. And ourselves. Bon appetit?
I think the lubricating oil needed a loop with a cooler built in. An interesting way to get rid of garden waste quickly... Next you need to work out how to fuel it while it's running. Bleed off air to run a shredder, maybe?
Methanol injection would keep it cool nitrous will yeet it to the fuckin moon or possibly methamphetamine injection that way it gets amped up runs around and steels people shit I know I would watch
@Bushman......you've heard of a "Runaway Diesel" in trucks or locomotives. This is a "Runaway BBQ Grill"....and everything you cook on it....is well done. :)
@@jlew5545 Well Mr. Lew.... Once again... Unusual. But then again , Rolls Royce fires frozen chooks into the intake manifolds of jet turbines running flat out to see what happens so I suppose your rather detonative practice of disintegrating truck turbo chargers in your rather imaginative manner is not quite as unusual as I first thought. But, if I might add a word or two of advice, it may serve to add a perforated cooling chamber directly attached to the underside of the BBQ plate through which you might pump compressed air into the fire drum in a similar manner to that used in jet engine afterburners. Might stop the BBQ plate from becoming so deformed. And as an additional thought, although I am not a workplace and stupidity nazi (because I firmly believe in the order of natural selection), you might consider constraining the detonative force of your exploding turbo chargers with a reasonably heavy mesh cage to avoid possible damage or destruction to expensive cameras. Best of luck with it.
Great eye protection. After all, what could go wrong? You only have something making boot pressure, and spinning at 100,000 rpm. MYE EYES ARE IMPERVIOUS TO FLYING METAL PIECES! You keep telling yourself that. I’m glad to see you had your safety squints on, and I’m sure your arm was plenty long to get you out of the danger zone. That extra 1/2” of arm stretch at the end really gets u into the safety zone.
