Turbo sizing problem....
02-20-2006, 08:29 PM
#1
0.5 BAR
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Join Date: Apr 2005
Posts: 179
Turbo sizing problem....
I sent this to Projekteg but I got no response, I also don't have the message in my outbox so I don't know if it sent, I cc'd it to myself though just incase this happened.
Anyone noticed this before? Am I just retarded and messed something up, or is there a legit problem here. If so, anyone care to clarify the problem in the formula 
The link you got the information from is down (in the selecting turbo sizet thread), so i could not consult them for answers.
The forumla you quoted mentions that Temp rise can be found by the equation "T2 = T1 (P2 ÷ P1)0.283 ", and you go on to show that with parameters of T1 = 75*F, P1 = 14.7psi and P2 = 24.7psi, that:
"T2 = 535 (24.7 ÷ 14.7)0.283 = 620 °R".
There is only one problem, if you actually work this out to get the solution for T2, it comes out to be 254.4, which clearly is not 620*R. I noticed the problem when I first got a negative Outlet Temperature, and then when that figure began to reach severe negatives when finding AE.
A new link, or clarification would be much appreciated.
Thanks,
Randy
The forumla you quoted mentions that Temp rise can be found by the equation "T2 = T1 (P2 ÷ P1)0.283 ", and you go on to show that with parameters of T1 = 75*F, P1 = 14.7psi and P2 = 24.7psi, that:
"T2 = 535 (24.7 ÷ 14.7)0.283 = 620 °R".
There is only one problem, if you actually work this out to get the solution for T2, it comes out to be 254.4, which clearly is not 620*R. I noticed the problem when I first got a negative Outlet Temperature, and then when that figure began to reach severe negatives when finding AE.
A new link, or clarification would be much appreciated.
Thanks,
Randy
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