great job, now, the only thing that bothers me is the lack of information about the thrust ratings and stuff.... without it... its like watching videos of a vacuum cleaner ...lol... :P I hope u take no offence :D Best of luck.. and pray for me
@mikeatyouttube ah From 0:58 to 1:26 it looks like that pipe on the end is rotating. The black mark on the reducer goes from the top of the pipe to the side. Perhaps I am wrong though. Not bashing or anything just an observation. Nice though!
@amsterdam84 Now that I watch it again...holy ****! I think you're right... amazing that I never noticed before. Well spotted! It does indeed seem to be rotating by about 70 degrees or so.
I think its much better lighting it up with externally. Most people just ad a sparkplug and have it spark constantly. (Totally redundant in my opinion) Great Job Mike!
You will need to make a large burn can to put all the heating elements in ! If you want to get really crazy, you could also use a 30 foot by 30 foot solar concentrator mirror as a heat source.
We did do an experiment with an augmenter set up consisting of a 12 inch diameter, 4 foot long pipe and a large cooling fan to generate electricity from the jet. The power from the jet was sufficient to blow the heavy fan clean over. We even have that on video I think. Quite funny.
Nice Job! It has a nice profile to it as of all the other home built jets Ive seen. Is your next step to make it lighter? It runs on propane right? There is an easy conversion to run it on Jet A/Kerosene.
Yup, one of the objectives was to at least make the thing look like a jet engine (sort of).
The fuel is propane, because that is the most convenient. Feeding it with liquid fuels simply requires another electrical pump, that's all. (Propane being under pressure doesn't require one). Most liquid fuel mini-jets require propane to start up from cold anyway, then they slowly switch to liquid fuel after ignition.
Other designs for other uses in the pipe line. This one still runs well but retired now
This comment has received too many negative votesshow
its useless turbojet engines are not meant to mount on a table and producing sound,i dont get that what it is doing.Gas turbines is for rugged and robust uses
Basically a burn can design is a compromise between achieving the lowest possible pressure drop across the burn can coupled with the highest flame stability.
A high pressure drop will give a stable flame but wastes power and efficiency from the wasted pressure drop.
My design is basically a "reverse flow" can, similar in concept to the original W.W.II. centrifugal compressor G.E. design which I suspect is a close copy of Frank Whittle's original engine.
This continues the comment above. YouTube wont let me reply twice(?)
I achieve a low pressure drop by by-passing some cold air from the compressor directly into the high volume "square mixer box" where it is mixed with hot air coming from the stainless steel round burn can.
The proportion of by-passed air decreases as power is increased.
Differences in expansion between both ends are taken account of by a "sliding tube" arrangement inside the burn can at the propane inlet end.
hi mike, does the inlet to the can require a valve of some description? or none at all? and do you know if all fuel is burned in the can? does some combust as its going out? and what is your conclusion regarding mismatched sizes of the turbines, to achieve any sort of benefits? cheers
No valve in the inlet is required for turbine based jets. The highest pressure point is at the compressor outlet. All fuel is completely burnt in the can. Remember, the turbine must power the compressor, so it is a good idea to make the turbine just a little larger in diameter. Choose an efficient operating point on your compressor map, then choose a turbine which is efficient at the same point.
The temperature in the burn can must be sufficient to overcome the inefficiency of the compressor multiplied by the inefficiency of the turbine at your chosen operating point. Additional temperature is then required to create a pressure in the jet pipe (at the turbine outlet) which is required to get any thrust.
Yes, you can divert some of the combustion gases from the burn-can (or even the compressed air directly from the compressor) to the jet pipe or to the nozzle, but you will not get as much thrust as you get from operating it in the standard mode with a suitably sized nozzle. (By standard mode, I mean 100% of the combustion gases going into the turbine).
The jet will run much hotter doing this gas diversion, since you are diverting power away from the turbine which needs this power to spin the compressor. The turbine makes up for this lost power by running hotter.
I have computer simulated (I write my own) and actually experimented with such things. The only time you get a net benefit (more thrust) from any air bypass scheme (hot, cold or a mixture of both) is if you achieve a choked flow condition in the nozzle (approximately 10 to 12 psi in the jet pipe AFTER the turbine), and if you still have excess pressure left over to power other things such as a large fan as they do in sub-sonic passenger jet engines.
This choked flow condition cannot be achieved normally with a single stage turbo-charger based jet: the efficiencies and pressures ratios of the single stage compressor and turbine are simply too low to reach this condition without melting the turbine.
The unique jet engines on the blackbird (SR71) for example, do appear to use un-burnt bypass compressor air forced directly into the after-burner jet pipe.
Max combustion chamber pressure I take it to is 25 psi but in this video the engine is just idling. The gas pressure in the combustion chamber at idle is low (not reliably readable on the gauge). It will run at very low gas pressure if the lubricating oil is hot.
I have no direct measurement of rpm.
It is calculated from Garrett pressure map. At 25psi combustion chamber pressure it's 140000rpm.
At 25psi combustion chamber pressure it runs at approximately 715 degrees centigrade (that's the gas temperature at the input to the turbine). This temperature is dependent on the ambient air temperature and the size of the nozzle (cross sectional area) at the exit of the turbine.
how hot does that thing run? like ridiculously hot at 1000 some degrees, or relatively cool at 200 some. I've lately been interested in applications of small to micro jet engines.
The spark plug (on the burn-can) does work to ignite the propane however it's so easy to light with a simple flame at the nozzle. See at time 0.11. After lighting, the flame rapidly retreats to the burn-can.
respect
michalil97 3 months ago
One question, what we gonna use it for?
DarrenDiAntonio 3 months ago
LOVE IT........ Keep up the good work!!!!
sctybdy 11 months ago
great job, now, the only thing that bothers me is the lack of information about the thrust ratings and stuff.... without it... its like watching videos of a vacuum cleaner ...lol... :P I hope u take no offence :D Best of luck.. and pray for me
dhakagod 1 year ago
@mikeatyouttube ah From 0:58 to 1:26 it looks like that pipe on the end is rotating. The black mark on the reducer goes from the top of the pipe to the side. Perhaps I am wrong though. Not bashing or anything just an observation. Nice though!
amsterdam84 1 year ago
@amsterdam84 Now that I watch it again...holy ****! I think you're right... amazing that I never noticed before. Well spotted! It does indeed seem to be rotating by about 70 degrees or so.
mikeatyouttube 1 year ago
@mikeatyouttube Ok at least I know I havent gone crazy.
amsterdam84 1 year ago
Is it just me or is that pipe on the end slowly turning out? Like it is untightening.
amsterdam84 1 year ago
Bad design!
speedy02 1 year ago
@speedy02 Runs does it not!
Helicopterpilot16 11 months ago
you should tell us how did you build it
W7887 1 year ago
your nabourhs must hate you!!! great work whats the thrust behind that?
artickid12 1 year ago
excellent work
mitsos306 1 year ago
u shuld put it o a gokart
666TECHNO666 1 year ago
Love that shiny nacelle
XJetPilot72 1 year ago
I think its much better lighting it up with externally. Most people just ad a sparkplug and have it spark constantly. (Totally redundant in my opinion) Great Job Mike!
DanielAlanJones 1 year ago
why did you install a rheostat on the electric blower?
DanielAlanJones 1 year ago
Replies are on the website - see above in the profile.
mikeatyouttube 1 year ago
@mikeatyouttube - Thanks Mike, I knew there had to be an explanation...
DanielAlanJones 1 year ago
Gas turbines are fun! :-)
Boosteroid 1 year ago
So I was watching these videos one night, and saw that you got the same turbo I got! Best thing that ever happened to a mid-80's chrysler!
Anywho, I was wondering about a couple things:
What size fuel orifice did you use? I'm going to try a 1/16" size. Is that too big? Small?
Did you regulate your fuel flow with a BBQ regulator? I did, and think it's not going to give enough.
Ging to start it for the first time tomorrow, if it will run.
Thanks, and have fun with it!
hawkeyeriggs5000 2 years ago
I put a reply to your questions on my website - see the link in the 'profile' section top right. Then scroll to the bottom of the web site page.
mikeatyouttube 2 years ago
13thbiosphere has asked...
"
can you please run a turbine on hydrogen or oxygen perhaps you could get a hydrogen generator and test the concept
I guess NASA have done this before
But I would like to see a micro setup
Could you put a wind turbine behind it and see is you can generate some electric energy
It would be fun to see electric energy breaking water then a wind turbine also splitting water
Perhaps 50% of the fuel could come from the wind turbine
who built you(r) turbine?
"
mikeatyouttube 2 years ago
Reply a):
You can run a Jet on anything that generates enough heat, So yes you could use electricity to generate hydrogen and use that as fuel.
You will need about 100,000 watts of power even for this little jet.
It would be more efficient to use the electricity to generate the heat inside the burn can directly from high power heating elements.
About one hundred, 1 kilo Watt heater elements connected together should do it.
Now you realize just how much power is stored in fossil fuels !
mikeatyouttube 2 years ago
You will need to make a large burn can to put all the heating elements in ! If you want to get really crazy, you could also use a 30 foot by 30 foot solar concentrator mirror as a heat source.
We did do an experiment with an augmenter set up consisting of a 12 inch diameter, 4 foot long pipe and a large cooling fan to generate electricity from the jet. The power from the jet was sufficient to blow the heavy fan clean over. We even have that on video I think. Quite funny.
Its a Garrett turbo
mikeatyouttube 2 years ago
Nice Job! It has a nice profile to it as of all the other home built jets Ive seen. Is your next step to make it lighter? It runs on propane right? There is an easy conversion to run it on Jet A/Kerosene.
kdvlder 2 years ago
Yup, one of the objectives was to at least make the thing look like a jet engine (sort of).
The fuel is propane, because that is the most convenient. Feeding it with liquid fuels simply requires another electrical pump, that's all. (Propane being under pressure doesn't require one). Most liquid fuel mini-jets require propane to start up from cold anyway, then they slowly switch to liquid fuel after ignition.
Other designs for other uses in the pipe line. This one still runs well but retired now
mikeatyouttube 2 years ago
you should protect the sucking system....
mine has suck a BIC lighter from the table and thrash the compressor blades, not my best day...
metalero19882 2 years ago
small ????
flouserve 2 years ago
It`s just the lubricating oil.
robinhooodvsyou 2 years ago
lol a trumpet horn
GeeksRus95 2 years ago
aye man mount that on something and fly it.
shorinjiryuu 2 years ago
This comment has received too many negative votes show
its useless turbojet engines are not meant to mount on a table and producing sound,i dont get that what it is doing.Gas turbines is for rugged and robust uses
COD5252 2 years ago
would you please share the details of your combustion chamber and burner can ? How you made it? Great job! Very artistic!
mocharythm 2 years ago
Basically a burn can design is a compromise between achieving the lowest possible pressure drop across the burn can coupled with the highest flame stability.
A high pressure drop will give a stable flame but wastes power and efficiency from the wasted pressure drop.
My design is basically a "reverse flow" can, similar in concept to the original W.W.II. centrifugal compressor G.E. design which I suspect is a close copy of Frank Whittle's original engine.
mikeatyouttube 2 years ago
You can see a picture of a cut-away example of a similar design taken at a museum. Click on my web page link above-right.
mikeatyouttube 2 years ago
@mikeatyouttube yeah thats what i was gonna say
freesafe7 2 years ago
You've gotta love that sound.
xXDarkMidnightSunXx 2 years ago 5
This continues the comment above. YouTube wont let me reply twice(?)
I achieve a low pressure drop by by-passing some cold air from the compressor directly into the high volume "square mixer box" where it is mixed with hot air coming from the stainless steel round burn can.
The proportion of by-passed air decreases as power is increased.
Differences in expansion between both ends are taken account of by a "sliding tube" arrangement inside the burn can at the propane inlet end.
mikeatyouttube 2 years ago
Hahaha! Funny!
Timberghost2000 2 years ago
ever tried strapping it on anything? :D
jbiggs12 2 years ago
very well constructed!! impressive!
holmesteadready 2 years ago
Like to see an ITT gauge. Best running turbocharger jet I've seen.
pirosteve 2 years ago
Thanks for the compliment!
Here's a reply to your comment (in two parts):
An ITT would be a nice addition but
the inter turbine temperature gauge
is not quite as useful as a turbine exit temperature gauge
because most of the pressure drop across the turbine
(and therefore most of the temperature drop)
occurs during the gas acceleration
on the way in to the turbine blades.
mikeatyouttube 2 years ago
The temperature of the turbine blades
is therefore much closer to the exit temperature
than the inlet temperature.
I agree that it would of course be nice to have both,
since it is easier to work out
the fraction of air burnt from the ITT
rather than back calculating it as I do.
mikeatyouttube 2 years ago
now THAT...sounds like an engine!
orlando2089 2 years ago
Thats one good use for a turbo charger lol
philipmtall 3 years ago
Haha i have the same furnace in my kitchen , it's very impressive turbine but it's run on natural gas or kerosene ?
yaaahhtcha 3 years ago
airvolume that goes through the device per minute?
muebermuth 3 years ago
Some answers for you :
The pressure at the entrance to the exhaust jet pipe was usually 5 or 6 psi
I think I remember getting 7 psi once time for a short burst.
The max temperature I ran it at was 850 centigrade in the jet pipe.
Any higher temperatures than that, the steel mixer box started to bulge !
The minimum self sustaining temperature was 460 centigrade.
The flow rate was approximately 20 lbs / minute of air
mikeatyouttube 3 years ago
Up to which height of pressure in the exhaust will this device work?
Burn tmerperatures?
Cheers
Martin
muebermuth 3 years ago
thats a big ass blow torch
vetteburna 3 years ago
Nice job Mike.
LarryCanFly 3 years ago
hi mike, does the inlet to the can require a valve of some description? or none at all? and do you know if all fuel is burned in the can? does some combust as its going out? and what is your conclusion regarding mismatched sizes of the turbines, to achieve any sort of benefits? cheers
snottspott 3 years ago
No valve in the inlet is required for turbine based jets. The highest pressure point is at the compressor outlet. All fuel is completely burnt in the can. Remember, the turbine must power the compressor, so it is a good idea to make the turbine just a little larger in diameter. Choose an efficient operating point on your compressor map, then choose a turbine which is efficient at the same point.
mikeatyouttube 3 years ago
The temperature in the burn can must be sufficient to overcome the inefficiency of the compressor multiplied by the inefficiency of the turbine at your chosen operating point. Additional temperature is then required to create a pressure in the jet pipe (at the turbine outlet) which is required to get any thrust.
mikeatyouttube 3 years ago
awsome machine dude..could a turbo jet operate if you directed only some thrust to the combustion turbine and the rest to the tail pipe?
snottspott 3 years ago
Yes, you can divert some of the combustion gases from the burn-can (or even the compressed air directly from the compressor) to the jet pipe or to the nozzle, but you will not get as much thrust as you get from operating it in the standard mode with a suitably sized nozzle. (By standard mode, I mean 100% of the combustion gases going into the turbine).
mikeatyouttube 3 years ago
The jet will run much hotter doing this gas diversion, since you are diverting power away from the turbine which needs this power to spin the compressor. The turbine makes up for this lost power by running hotter.
mikeatyouttube 3 years ago
I have computer simulated (I write my own) and actually experimented with such things. The only time you get a net benefit (more thrust) from any air bypass scheme (hot, cold or a mixture of both) is if you achieve a choked flow condition in the nozzle (approximately 10 to 12 psi in the jet pipe AFTER the turbine), and if you still have excess pressure left over to power other things such as a large fan as they do in sub-sonic passenger jet engines.
mikeatyouttube 3 years ago
This choked flow condition cannot be achieved normally with a single stage turbo-charger based jet: the efficiencies and pressures ratios of the single stage compressor and turbine are simply too low to reach this condition without melting the turbine.
The unique jet engines on the blackbird (SR71) for example, do appear to use un-burnt bypass compressor air forced directly into the after-burner jet pipe.
mikeatyouttube 3 years ago
Cool turbine ! Very neat burner too ! Check out my vids, I made one with a T3 sized turbo too.
jacebigelow 3 years ago
in the beginning it sounds like a pulsejet
vinny4punt0 3 years ago
Nicely done project. Very solid. Would be great to take to a local fair. Much better than those old tractors and water pump engines!
Partok81 3 years ago
mike @ u tube dk2
hot, sound is sweet
25psi/140000rpm !
keep it up
c.
unturbo 3 years ago
Job well done
Can you please show combustion chamber pressure and EGT.
Also impeller chamber pressure and idle RPM
Thank you
G.B.
gilbertborno 3 years ago
Max combustion chamber pressure I take it to is 25 psi but in this video the engine is just idling. The gas pressure in the combustion chamber at idle is low (not reliably readable on the gauge). It will run at very low gas pressure if the lubricating oil is hot.
I have no direct measurement of rpm.
It is calculated from Garrett pressure map. At 25psi combustion chamber pressure it's 140000rpm.
A high power run will be added soon.
See next comment.
mikeatyouttube 3 years ago
At 25psi combustion chamber pressure it runs at approximately 715 degrees centigrade (that's the gas temperature at the input to the turbine). This temperature is dependent on the ambient air temperature and the size of the nozzle (cross sectional area) at the exit of the turbine.
mikeatyouttube 3 years ago
Really nice sound and construction! Thanks for the video.
ELHV 3 years ago
how hot does that thing run? like ridiculously hot at 1000 some degrees, or relatively cool at 200 some. I've lately been interested in applications of small to micro jet engines.
snkatk 3 years ago
this rules. Can't wait to see the dual turbo version!
phugedaboudet 4 years ago
Did the spark plug ever work to ignite and start burning?
kletskov 4 years ago
The spark plug (on the burn-can) does work to ignite the propane however it's so easy to light with a simple flame at the nozzle. See at time 0.11. After lighting, the flame rapidly retreats to the burn-can.
mikeatyouttube 4 years ago
Nice!
jommy99 4 years ago