ckliever
Member
Joined: November 2019
Posts: 28
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Post by ckliever on Dec 16, 2019 12:50:14 GMT -5
Hey all,
I’m sure it’s here in the forum somewhere but I’ve been unable to find anything so far - I was hoping to learn a calculation or at least good rule of thumb for figuring the length and exhaust opening for the tailpipe. I’m doing a turbo based engine.
Thanks!
Chris
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Post by racket on Dec 16, 2019 15:43:41 GMT -5
Hi Chris Have you read jetandturbineowners.proboards.com/thread/680/diy-turbines ?? The jetpipe need only be a "turb wheel exducer diameter" long , though a couple of "diameters" will provide length for thermocouples and a P4t pickup and a 10 degree tapered jetnozzle , long pipes only reduce output from extra losses . As for the jet nozzle sizing , theres "variables" , but one that is small enough to produce the desired maximum design temperature within the jetpipe ( TOT) is what you eventually need . A small engine using a turbo with limited max P2 will need a relatively larger jetnozzle than a larger engine with higher jetpipe pressures and higher gas velocities out of the nozzle. If you have comp and turb maps its possible to calculate a theoretical jet nozzle sizing Cheers John |
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ckliever
Member
Joined: November 2019
Posts: 28
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Post by ckliever on Dec 16, 2019 21:53:23 GMT -5
Perfect! Thanks John!
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