HY30W Vector Nozzle First Build

[nicenozzle]

So after a couple years or so on and off planning (Just how my brain works) I've finished my designs for my first build. I think I may have gotten a perfect turbo, being the Holset HY30W, aside from it being a little small, around a .4-.5 AR, 70% larger Exducer exit than intake tubing (Too big a % ?) Just an Ebay find, though I've read since that they're hard to come by, so replacement may be an issue.

Aside from just building a turbojet, I'd like to use the build to test out a vector nozzle design, shaping and sizing of nozzle bits is all figured out, works something along the lines of a nozzle split into many overlapping fins, each hanging loosely to something like a V-Band, but supported and mounted to a floating ring, which in turn is moved by small linear solenoids, changing the position of the nozzles "flaps" depending on the floating rings respective position. Look i'll just build it, I'm sure that was confusing, Also will post models down below.

Used Jetspecs for the combustion chamber design, when actually built, will adjust slightly to my own math since jetspecs is rather generalist.

Fuel blend is my own I tested based on burn time, verrrry rough octane measurements, residue amount, and black smoke emitted

Combustion Chamber: 80% Kerosene, 10% Ethanol, 10% Methanol
Afterburner: 70% Kerosene, 20% Diesel, 5% Ethanol, 5% Methanol

Fuel Nozzle will at least in the beginning be the simple metal tube in a ring with jets stickin out of it, but I'd like to make that a bit more interesting/efficient, Thinking about a preignition chamber, with maybe a fuel with a lot more kick in that, similar to how the SR-71 was ignited. Preignition in cars was proven very well for burn times and complete combustion, so I cant see why not the little extra work would be worth it, with the added benefit of not constantly melting spark plugs.

Could go on another 10 paragraphs about the SHPD oiling, automatic shutoffs, fire suppression, materials, and actual specifications, so lmk about questions, tips, things I'm blaringly doing wrong since this is a first build (Talking to you racket ) I'm open to it all. 






Full System Design




Afterburner with Vector Nozzle






Most likely Flame tube design

EDIT- Forgot my Jetspecs

[racket]

Build it :-)

Then we can fix it ;-)

[nicenozzle]

oh I hate you for that

[racket]

LOL.........sorry , I was feeling cheeky :-)

Why do you want to waste good ethanol by burning it in a GT , mix it with some orange juice and drink it whilst building the engine .

Alcohol fuels are useless in a turbine , their BTUs/lb is too low , straight kero is the way to go , nothing better for a turbo based engine

[nicenozzle]

I've read a few things on here about that, the only benefit to the denatured alcohol that I was thinking was the cooling effect, same idea as methanol in cars or nitrous, the longer I can keep the temps down, the longer I can run it without damage. Yes, not as energy dense, and 20% of a fuel mix isn't anything to shrug off, but if I can use a simple fuel blend to extend each run or the life of the machine altogether, I think that's a win.

[racket]

Forget automotive thinking , you're playing with gas turbines now , there are some common bits but best to not be distracted .

Why would you want a cooling effect , we're trying to heat up the air , its the turbine inlet temperature that powers the turbine that drives the compressor , we need a certain temperature to do that , if you want to extend run times , fit a larger fuel tank or use a fuel with a greater heat density like diesel , you'll use twice as much methanol as diesel to do the same job .

Your actual running temperatures would be the same if running 100% methanol or 100% diesel , running temps are dependant on component efficiencies and "backpressure" on the engine .

[nicenozzle]

Heat = compression so yes I may be connecting automotive background too much here, reliability is what it is and heat is the goal in the end

I am adding diesel to the afterburner fuel mix, but with the combustion chamber, sticking to kerosene only will be the at least initial idea here.

Have you seen any precombustion chambers? Due to the need for a very quick burn maybe the ethanol would have a good use there, or even propane, I think it could benefit complete combustion and leave the ignition out of a very hot environment, but I haven’t seen it used I’m sure there’s a reason as to why not

[racket]

The RR C 30 combustor has a form of precombustion , but more to do with pollution than power , quick burn needs turbulence and more interaction between fuel and air , more sophistication/complication, alcohol won't do anything but empty your wallet faster :-( .

Remember our engines have maximum total pressure at the compressor wheel exducer , from then on it falls throughout the rest of the engine irrespective of fueling , we can't force air/gases through anywhere , it has to flow voluntarily often converting some of the total pressure to more or less static or dynamic components .

Gas turbines are "designed" to run at the maximum safe temperature and tip speeds , lower either of these and the power drops away

[nicenozzle]

So more so naturally heat managed, got it

I’ll look into the engine and see if there’s any useful idea there, will just put more focus into making a better nozzle/injector, I’ll update the thread as the build goes on, need to get my hands on some stainless that isn’t from a metal shop at gold weight price lol