htevo80
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Joined: November 2018
Posts: 36
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Post by htevo80 on Feb 8, 2019 23:37:14 GMT -5
After 2 years I'm at the point of starting my engine. I was curious on everyone's thoughts on my combuster design and whether it will function properly really don't want to burn up a new old ht80 Fuel system- hydraulic gear pump mated to DC motor capable of 1000psi+(tested). Nozzle- atomization nozzle .72 lpm at 10bar I'm hoping to not need a secondary fuel nozzle for starting but don't know if the rc edf will provide sufficient flow for starting Turbo-88mm compressor inducer
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Post by racket on Feb 9, 2019 0:37:34 GMT -5
Hi
Could you please supply a bit more info on the fuel nozzle positioning and its spray angle , generally its a good idea to have the Primary holes at the theoretical impact point of the spray cone on the side wall.
I'd prefer to see fewer, but larger diameter, Primary Holes , maybe 8 or 10 bigger holes to get air penetration deeper into the flametube to promote recirculative airflows to improve combustion of the fuel , multiple small wall holes are "OK" for radial propane injection , but not the best for liquid fuel .
Cheers John
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htevo80
Member
Joined: November 2018
Posts: 36
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Post by htevo80 on Feb 9, 2019 0:55:58 GMT -5
Hi Could you please supply a bit more info on the fuel nozzle positioning and its spray angle , generally its a good idea to have the Primary holes at the theoretical impact point of the spray cone on the side wall. I'd prefer to see fewer, but larger diameter, Primary Holes , maybe 8 or 10 bigger holes to get air penetration deeper into the flametube to promote recirculative airflows to improve combustion of the fuel , multiple small wall holes are "OK" for radial propane injection , but not the best for liquid fuel . Cheers John The fuel nozzle is 80 degree axial flow hollow cone atomization nozzle it's positioned just protruding from the inside the flame tube through the swirler vanes(hole in the middle of vanes). The primary holes are at what I believe to be where the cone contacts the wall. The holes are also slightly counter sunk to improve flow through them
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Post by racket on Feb 9, 2019 1:59:04 GMT -5
OK , then she should be able to fire up , all the best :-)
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htevo80
Member
Joined: November 2018
Posts: 36
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Post by htevo80 on Feb 9, 2019 2:59:19 GMT -5
OK , then she should be able to fire up , all the best :-) Any thoughts on the design/efficiency? I wanted an axial flow combuster but am now having second thoughts about 2 180° bends. Thank you for the help
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Post by turboron on Feb 9, 2019 7:54:05 GMT -5
htevo80, you may need an inlet side "cheese cutter"(a plate with drilled holes) to straighten the flow before it enters the combustor to get the best performance. Any length of straight pipe before the "cheese cutter" will help. A straight section of 6 pipe diameters is the best compromise. The outlet side should be okay.
Thanks, Ron
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CH3NO2
Senior Member
Joined: March 2017
Posts: 455
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Post by CH3NO2 on Feb 9, 2019 8:31:44 GMT -5
If everything is all set to go, Fire it up! 180' bends are generally not good for efficiency but there are plenty of good working examples all over youtube. You can always shut it down if you notice anything is over heating. Weather it starts or not you can take notes and learn something from it. Maybe it works just fine?
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htevo80
Member
Joined: November 2018
Posts: 36
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Post by htevo80 on Feb 9, 2019 20:01:59 GMT -5
Thank you for all the information guys I'll let you know how it goes.
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monty
Senior Member
Currently being spanked by mother nature.......
Joined: September 2018
Posts: 400
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Post by monty on Feb 13, 2019 21:38:19 GMT -5
light her up!!
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htevo80
Member
Joined: November 2018
Posts: 36
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Post by htevo80 on Feb 14, 2019 19:21:58 GMT -5
First start went very well here's the video youtu.be/sesR8EZjp04Egt probe wasn't in the right place because it only read 400°f I only went to 400 psi of fuel pressure for this first test until I get the egt repositioned
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Post by racket on Feb 14, 2019 20:18:51 GMT -5
Congratulations :-)
She's running cool , no "colour" from the turb wheel , a good first spoolup.
Cheers John
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htevo80
Member
Joined: November 2018
Posts: 36
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Post by htevo80 on Feb 15, 2019 0:53:37 GMT -5
Congratulations :-) She's running cool , no "colour" from the turb wheel , a good first spoolup. Cheers John Thank you John She seemed to be running nice I'm excited to get a full power run in just going slow. Anyone know what kind of p2 pressure I should expect at full power?
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Post by racket on Feb 15, 2019 1:37:55 GMT -5
Hi
I think a max P2 of 30 psi is reasonable considering the turbos unknown heritage or condition.
Cheers John
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htevo80
Member
Joined: November 2018
Posts: 36
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Post by htevo80 on Feb 15, 2019 9:47:01 GMT -5
Hi I think a max P2 of 30 psi is reasonable considering the turbos unknown heritage or condition. Cheers John Hi The turbos new old stock I got it from government liquidation. I'm hoping to get the tach installed soon so I can really know what's going on. More testing to come. I'm sure I'll be back with more questions -Gavin
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htevo80
Member
Joined: November 2018
Posts: 36
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Post by htevo80 on Feb 15, 2019 12:32:16 GMT -5
Hi After more testing I reached a p2 of about 35 psi but my egt only reached 900f should I push it further what would be my limiting factor -Gavin
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