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Post by azwood on Apr 28, 2018 2:05:48 GMT -5
LOL...............its ~15:1 in the Primary Zone , but possibly a tad hot for your instrument ;-) Now I get why you use a pyro
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Post by racket on Apr 28, 2018 4:49:40 GMT -5
Yep , the turbine outlet temperature ( TOT) is the safest place to measure a temp................temperatures are up towards 2,000 C in the Primary Zones 30% of air , the Secondary Zones 20% of air starts to cool things down a bit whilst still burning off any residual fuel , then the Tertiary Zone with its 50% of air flow cools the gases down to a temp the turb wheel can survive in, with another 100+ deg C drop thru the turb stage the TOTs can be easily handled by a K type thermocouple .
Cheers John
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Post by azwood on Apr 28, 2018 4:55:18 GMT -5
Yep , the turbine outlet temperature ( TOT) is the safest place to measure a temp................temperatures are up towards 2,000 C in the Primary Zones 30% of air , the Secondary Zones 20% of air starts to cool things down a bit whilst still burning off any residual fuel , then the Tertiary Zone with its 50% of air flow cools the gases down to a temp the turb wheel can survive in, with another 100+ deg C drop thru the turb stage the TOTs can be easily handled by a K type thermocouple . Cheers John The hole sizes are marking so much more sence now as I cum to understand everything it's clear to see why the defuzer is at the bottom it's a afr and zone cooling thing really enjoying learning all this.thanks guys
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Post by azwood on Apr 28, 2018 4:59:06 GMT -5
Just orded a k type 200/1200degree
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Post by racket on Apr 28, 2018 17:23:53 GMT -5
You need the sheathed type of thermocouple , the unsheathed ones are OK for T2 but not TOT
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Post by azwood on Apr 28, 2018 17:32:19 GMT -5
You need the sheathed type of thermocouple , the unsheathed ones are OK for T2 but not TOT What do you mean by sheathed ?
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Post by azwood on Apr 28, 2018 17:41:04 GMT -5
That's what I got
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Post by racket on Apr 28, 2018 17:59:28 GMT -5
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Post by azwood on Apr 28, 2018 18:01:49 GMT -5
Yep got ya it was only 23 bucks well see how long it lives
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Post by azwood on Apr 28, 2018 18:25:05 GMT -5
One more question for testing trust what sort of outlet cone do I need size and length wize
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Post by racket on Apr 28, 2018 19:44:49 GMT -5
You'll be needing a jet nozzle of ~70-72 mm dia ( ID) , ideally the ID of the jetpipe should be the same diameter as the shroud on the exducer , you have an 88 mm exducer on your wheel so the shroud would be ~89 mm, but you'll probably need to use 4 inch exhaust tubing with an ~98 mm ID , the jetpipe length of the 4"dia section need only be 150 - 200 mm , just sufficient length to allow the gases to even out a bit before entering the jet nozzle, and somewhere to fit your thermocouple, and a pitot tube for measuring the total pressure in the jetpipe ( P4t) , a very useful "number" when designing the freepower stage as the TOT and P4t indicate the energy level available , when taken in conjunction with mass flow , the flow areas of the freepower can be calculated.
If once you run the engine up to full power and your TOTs are still a bit low ( <650 C ) , then the jet nozzle diameter can be reduced a millimetre or so to increase temps
Cheers John
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Post by azwood on Apr 28, 2018 19:52:02 GMT -5
You'll be needing a jet nozzle of ~70-72 mm dia ( ID) , ideally the ID of the jetpipe should be the same diameter as the shroud on the exducer , you have an 88 mm exducer on your wheel so the shroud would be ~89 mm, but you'll probably need to use 4 inch exhaust tubing with an ~98 mm ID , the jetpipe length of the 4"dia section need only be 150 - 200 mm , just sufficient length to allow the gases to even out a bit before entering the jet nozzle, and somewhere to fit your thermocouple, and a pitot tube for measuring the total pressure in the jetpipe ( P4t) , a very useful "number" when designing the freepower stage as the TOT and P4t indicate the energy level available , when taken in conjunction with mass flow , the flow areas of the freepower can be calculated. If once you run the engine up to full power and your TOTs are still a bit low ( <650 C ) , then the jet nozzle diameter can be reduced a millimetre or so to increase temps Cheers John Thanks I use a pilot when I do blow threw turbo carbs on bikes.ill get the flange made so I can do the exducer tube I have a few things in the mail still but I'd say I will be testing in a few weeks
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Post by racket on Apr 28, 2018 20:00:01 GMT -5
Yep , ......Its getting close :-)
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Post by azwood on Apr 28, 2018 20:36:34 GMT -5
Just as a bit of a test I cut the end of an injector and tiged a small tube on it to see if it still atomized fuel surprisingly it works without the inner parts this might make a good primery jet
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Post by azwood on Apr 28, 2018 20:37:42 GMT -5
A little hard to see but I works
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