|
Post by racket on May 3, 2024 20:44:55 GMT -5
Yep , its the recirculation thats important
|
|
|
Post by racket on May 3, 2024 16:32:17 GMT -5
Hi Soorkie
It might be beneficial for you to build a turbocharger based engine first to gain experience before attempting the much more complex task of building an axial engine , the turbocharge has containment built in , so much safer
Cheers John
|
|
|
Post by racket on May 3, 2024 16:28:49 GMT -5
I don't think the "vacuum" at the core will make much difference to the flow of air through the flametube wall holes , you're also feeding in a large volume of gaseous fuel , a 1,000 times more volume than liquid fuel .
If you can produce a nice spread gaseous fuel across the flametube , it'll work just fine :-)
|
|
|
Post by racket on May 2, 2024 16:53:39 GMT -5
What you're proposing is a hollow cone spray nozzle normally used in gas turbines when spraying liquid fuel . Yes it creates recirculation into the "hollow" center of the spray pattern for good flame stability. I guess it'd be a case of getting a large enough flow capacity for gasious injection rather than liquid , but can't see why it wouldn't work :-) I once tried something similar to inject water into the comp scroll of my TV84 engine imgbb.com/hBTkxRL , I made up a swirl chamber that was screwed to the side of the scroll near , the brass plug blocking off the supply hole can be seen in the pic.
|
|
|
Post by racket on May 2, 2024 16:34:19 GMT -5
Hi Soorkie
To produce a 4:1 pressure ratio you'll be needing to spin the comp to >120,000 rpm , 50,000 rpm will be an idling speed
Cheers John
|
|
|
Post by racket on Apr 29, 2024 17:05:24 GMT -5
1 lpm is a pretty small amount for a turbo of your size :-(
|
|
|
Post by racket on Apr 29, 2024 17:01:58 GMT -5
Hi Anders
Now thats one very nice mill :-)
Lotsa handles and knobs, a versatile machine , heh heh , nothing will be beyond you now .
15mm plate , you'll be able to bash things on that without worrying about denting it or bouncing around , I like your vice mounting on the corner , lots more clearance for those awkward jobs .
LOL...you might need a bit more bracing on the new test stand once the beast is at full power ;-)
Cheers John
|
|
|
Post by racket on Apr 29, 2024 16:49:17 GMT -5
Hi Richard
I did a long time ago and found there was very little from a static rotor when cold even with the 100psi pressure I was feeding the TV84 turbo , but hard to measure with hot oil out of a running engine ;-)
As long as theres design pressure going in , I guess the amount coming out of the turbo is irrelevant, but with all the entrapped air its volume is greatly enhanced.
Cheers John
|
|
|
Post by racket on Apr 28, 2024 17:24:02 GMT -5
RC Don did some beautiful builds , but ran his engines at modest temps and pressures , hence the modest outcomes
|
|
|
Post by racket on Apr 27, 2024 17:25:20 GMT -5
Hi Richard
They make some nice stuff :-)
But we really don't need that level of flow control unless we also have variable geometry on the turbine wheel as well to be able to "match" the power requirements of the comp with any degree of efficiency .
Generally, if a turbo has NGVs in the turb scroll , they can be fixed in position once the sweet spot has been determined .
Nice big comp wheel though , had a look at some of their other videos :-)
Cheers John
|
|
|
Post by racket on Apr 26, 2024 18:55:25 GMT -5
Hi Richard
Nice reading :-)
Thanks for the Link .
I'm still waiting for my battery to arrive , hopefully next week , I'm ready to go testing .
Cheers John
|
|
|
Post by racket on Apr 26, 2024 17:34:50 GMT -5
Hi Chuks
LOL.............4.7 :1 will be more than enough :-)
Excellent news about the Parts
Cheers John
|
|
|
Post by racket on Apr 25, 2024 0:19:48 GMT -5
|
|
|
Post by racket on Apr 20, 2024 18:54:28 GMT -5
Some interesting numbers .............that kit is for www.speedmaster79.com/P-2-Centrifugal-Supercharger-Without-Gearbox1150 CFM = 88 lbs/min =1.46 lbs/sec 22psi max boost = 2.5PR at 78% effic = 110 C deg rise 110 C = 67.5 HP/lb 67.5 X 1.46 lbs/sec = 98 HP Using a skinny belt at 52,000 rpm ............. I need to find out who makes such fabulous transmission products . 98 HP at 52,000 rpm = a tad under 10 ft/lbs of torque , but a freepower can produce twice its max rpm torque at stall , so ~5 ft/lbs max for the freepower , so say 50 HP for a freepower ..........with good heat protection for the belt , no heat soakback from the redhot turbine wheel , which could also make bearing cooling an issue as well . BUT , toothed belts are good , I used one back in the 1970's to run the supercharger on my bike , but it kept on breaking :-( Cheers John
|
|
|
Post by racket on Apr 19, 2024 15:59:30 GMT -5
Hi Richard
Yep , always charge up after a test run .
I have an old 12V deep cycle battery from a golf cart that only died in the last year , it was originally purchased in 1996 , a good quality German made one
Look after them and they last :-)
Cheers John
|
|