henrik
New Member
Joined: January 2014
Posts: 3 
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Post by henrik on Jan 6, 2014 11:01:45 GMT -5
hello im about to start my first turbojet build and i have som questions.
i have found a cheap hx 82 with divided entry . and a much more expensive hx 82 with single entry
i have read somewhere that divided entry on the turbo is bad is it so bad that it is impossible
or is it possible to gring down the wall in the entry ?
do you have any suggestions on a 12v oilpump?
how thick does the material need to be in the comustion chamber ?
does it need to be some special stainless quality or can i use just some from the stainless scrap bin
// henrik lagesson sweden
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Post by stoffe64 on Jan 6, 2014 12:04:28 GMT -5
hello Henrik!
i will start to give you some answers, single entry scrolls IS much better than divided, if possible go for that one, 12 volt oil pump from MARCO such as Anders is using on his turbine bike OR the piusi viscomat which i build with!
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Post by stoffe64 on Jan 6, 2014 12:49:31 GMT -5
myself look for 316 stuff, acidproof Stainless, a bit hard to work with but good enough for most diy builds!
cheers/stephan
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Post by racket on Jan 6, 2014 16:41:08 GMT -5
Hi Henrik The divided housing is up to 10% less efficient due to the extra friction from the centre wall which increases the losses, but its still possible to use a divided housing , just make sure you smooth out the edge of the wall so that the gases have a more aerodynamic entry into the scroll , a more rounded edge rather than a sharp edge that can overheat and "burn" if the temperatures are high . Combustor outer wall can be in mild steel , though stainless looks a bit nicer , as long as its thick enough to hold the pressure , .................flametube needs to be in sheet stainless of 1mm thickness or greater , though some guys have used thick mild steel tubing (>3mm) for flametubes . Checkout the various build threads for ideas and specifications ...................also have a look on the Yahoo DIY Turbines Site groups.yahoo.com/neo/groups/DIYGasTurbines/infoCheers John |
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spartablades
Member
hi i m new here ..i m start to build that project ..a have a turbo with intake inducer diameter 7,4
Joined: February 2020
Posts: 33
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Post by spartablades on Apr 10, 2020 17:37:24 GMT -5
Hi Henrik The divided housing is up to 10% less efficient due to the extra friction from the centre wall which increases the losses, but its still possible to use a divided housing , just make sure you smooth out the edge of the wall so that the gases have a more aerodynamic entry into the scroll , a more rounded edge rather than a sharp edge that can overheat and "burn" if the temperatures are high . Combustor outer wall can be in mild steel , though stainless looks a bit nicer , as long as its thick enough to hold the pressure , .................flametube needs to be in sheet stainless of 1mm thickness or greater , though some guys have used thick mild steel tubing (>3mm) for flametubes . Checkout the various build threads for ideas and specifications ...................also have a look on the Yahoo DIY Turbines Site groups.yahoo.com/neo/groups/DIYGasTurbines/infoCheers John so the outer tube: stainless steel with a thickness of 2mm and inner (flame tube) 1.5 mm stainless steel tube now for how many injectors I will need to install I do not know..because in my mind I am planning to put 1 or 2 injector injectors from a car how thickness you think ?   |
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