Turboshaft Racecar?

[CH3NO2]

Apr 4, 2017 22:53:54 GMT -5 racket said:

...the turb inducer tip height was smaller than the one on the 56 Trim comp GT6041.

There are many places that sell replica GT6041's and they vary on their turbine trim and tip height.   Are there basic formulas to follow on these variables?

[racket]

Hi Tony

As long as the inlet area to the turbine wheel ( inducer) is roughly the same as the inlet area to the compressor wheel ( inducer) then it should be OK .

As an example , our TV94 comp inducer is 98 mm dia - 7543 sq mms , the turb wheel is 129 mm dia by 20 mm tip height 8105 sq mms or ~7% bigger , the GT6041 has 106 mm inducer of 8824 sq mms , turb wheel 10,210 sq mms , 15% bigger .

But depending on the gas density going into the wheel things can vary , hotter gases from a choked scroll throat give higher velocities due to the speed of sound changing , but lower densities due to the higher temps than if using "cool" diesel exhaust gases .................each application needs to be designed accordingly...........so no "simple" hard and and fast rules , ...........theres probably some very complicated formula that is able to take all variables into account , but we probably can't use them due to other unknown parameters like component efficiencies .................theres a genuine need for some trial and error design work :-(

If you could post a Link to those "replica" 6041s I take a look .

Cheers
John

[CH3NO2]

Hi John,

I'm assuming these are replica due to it no longer being listed on the Turbobygarret website.

link 1

link 2


Tony

PM sent

[CH3NO2]

And I'm all good for parametric trial and error. Its expected.

[CH3NO2]

I called TH Motorsports to place an order for the Garrett GT6041 in 56 Trim, 1.47A/R listed on their website! YAY! 
When they checked stock they put me on hold for a few minutes and came back to say "It's gone." and they say it's no longer available...

So its back to evaluating and selecting a good turbo... that is in production.

I looked into Borg Warner this afternoon. The largest "automotive" turbo Borg Warner makes is the S500SX-E Core 15009097002, Turbine Housing 178498
Found a couple of compressor  maps but not  the turbine  maps.  Not yet anyways.  I'll contact them tomorrow.
They also appear to have a LOT of turbos for heavy industrial diesel engines.  I'll check  into this too.











>>>Turbo MatchBot
Borg Warner has an interesting turbo matching calculator "MatchBot".   Havn't figured out how to apply it to a turbojet just yet but it looks promising.