Nashville, TN Turbine Build

[jamiep]

regarding bypassing some of the gas to the turbine... it seems the smart place for me to do it would be to use the bypass hole that is built into the turbo and put a valve on it (this is at the turbine wheel).

My thoughts are that the compressor would still be able to supply plenty of dillution air to the combustor.

Thoughts on that? Basically, I am trying to trick my turbine section into thinking there is less flow to the wheel, reducing surge.

I still plan to monkey with the flame tube.

Jamie

[racket]

Hi Jamie

You could regulate the inbuilt wastegate , but keep in mind the temps will spike rapidly with any bleeding off of gases , so gently gently with the amount of wastegate movement , you might find that it'll barely need cracking off its seating .

Cheers
John

[wolfdragon]

perhaps the small brass needle valve you can get at lowes or home depot in the plumbing fitting area would be a good place to start?

smaller seating area than a wastegate would be...

I know the ones at lowes are solid brass, so no soft sealing bits to worry about melting:

[racket]

Hi Wolf

I'd have to agree with you that its probably easier and safer to simply bleed off relatively cool P2 air than combustion gases , the "positive" with bleeding combustion gases would be extra thrust if the "more energetic" gases were plumbed into the jetpipe rather than P2 air , but for this early stage of experimentation I'd be going for P2 air simply for safety reasons , it'd also be much easier operating a simple valve fitted to the side wall of the combustor , than the wastegate .

Cheers
John

[jamiep]

Chris - as for afterburners, I am in the process of building mine. I am using 4" stainless that comes to a 2.25 outlet. I saw your plan you posted. I have already cut a flame holder ring out of steel. Do you find the little steel cone a necessity?

Jamie

[jamiep]

I am in search of a cheap 12 volt inline fuel pump... anyone got a source?

jamie

[wolfdragon]

I would start at summitracing jets or speedway, all are hot rod sites, I know summit has their bargain brand which isn't bad, I imagine the other two have something similar.

I personally use summitracing, they have a good filtering system so it's easy to figure out what part you really want

[ernie wrenn]

What pressure and volume?

Ernie

[jamiep]

As for pressure, Chris said he was able to run as low as 10-20psi on the afterburner. As for volume, he mentioned running a .060 - .090 jet aimed at the fan.

I will probably use this setup and if I need more fuel, keep drilling out the jet.

jamie

[jamiep]

The cheapest electric fuel pump I see on summit is like $60

I would love to find something around $20


jamie

[jamiep]

Pipe has spark plug bung that will weld in...

Jamie

Attachments:

[jamiep]

The core of the afterburner. Manifold has a temp probe fitting. Steps up, then has a flame holder circle, then another flame holder at end.

Jamie

[jamiep]

core

Attachments:

[jamiep]

assembly before welding.

Jamie

Attachments:

[ernie wrenn]

I have some pumps we use for the motorcycle kits 10/15 psi no problem.. Your cost is $25 ea + fgt. That is my cost.

Ernie
www.compucarnitrous.com