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#Post#: 5253--------------------------------------------------
Newbie questions....turbine design
By: maximoney1 Date: January 27, 2015, 10:16 am
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@Lynxwind
I'm hesitant to ask for fear of offending you, but i'm trying to
understand your turbine design and the pitfalls one might
encounter if any changes were made. (Please don't think of this
as a derogatory remark, as i think you have a fantastic design,
it is just i believe i need to make some adaptations to match my
particular environment/location circumstances.)
My question is this, your airfoils are attached through the
centred mount with tensioning wires. What would be the
disadvantages of having the airfoils attached at top and bottom
mounts, such that the airflow through the turbine would be
undisrupted by a centre shaft? (I realise the top mount would
need to extend some distance away and be orientated in some
manner as to not disrupt the wind stream before the turbine.)
If i was looking to keep the same diameter(similar TSR), but
treble the length of the airfoils(increased catchment), could
the attachment at both end of the airfoils work, with some sort
of strengthening in the middle of the airfoil length? Are the
airfoils only streamlined sufficiently enough if they have your
designed end pieces, similar to aircraft wings?
Also, at what windspeed does your airfoil self start and is this
dependant on the weight profile, the diameter or combination of
both?
Thanks for any help offered.
#Post#: 5254--------------------------------------------------
Re: Newbie questions....turbine design
By: lynx wind Date: January 27, 2015, 12:58 pm
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Not offended at all. The design isn't perfect because the
compromises are all over the place. A perfect design would be a
balance between every trade off in function, weight, efficiency,
robustness, cost, complexity .....
Keep in mind when you tweak one area, consideration needs to be
given to the whole machine's performance. You can go taller but
the stress on the blades goes up dramatically. You can get rid
of the bracing but need to find another way of strengthening
(SUT is experimenting with top and bottom rings)
I don't do top and bottom mounts because dynamic balancing is a
nightmare (see WindSpire) Carrying the load centrally solves a
lot of problems.
The Blade tips do seem to increase performance by 15%
Most of the turbines I design will self start at 2-5 mph
#Post#: 5256--------------------------------------------------
Re: Newbie questions....turbine design
By: maximoney1 Date: January 27, 2015, 1:22 pm
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Really appreciate the pointers, off now to read up on dynamic
balancing and WindSpire reference. Thanks again.
#Post#: 5259--------------------------------------------------
Re: Newbie questions....turbine design
By: maximoney1 Date: January 27, 2015, 1:47 pm
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@lynx
edited...further reading rendered the orig question pointless.
;)
#Post#: 5267--------------------------------------------------
Re: Newbie questions....turbine design
By: maximoney1 Date: January 27, 2015, 4:09 pm
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@SUT
I would appreciate any developements you might have made with
regards top & bottom rings on the turbine(see lynx previous
post).
cheers
jim
#Post#: 5269--------------------------------------------------
Re: Newbie questions....turbine design
By: maximoney1 Date: January 27, 2015, 5:24 pm
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A big thumbs up to lynx, re the dynamic balancing aspect,
something i hadn't even considered.
#Post#: 5271--------------------------------------------------
Re: Newbie questions....turbine design
By: sut Date: January 27, 2015, 7:05 pm
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Well its still spinning!! but I have not had any high wind to
say its great! Have you seen the video I did on it? ( Re: 175
Watt Seagull DIY Kit
« Reply #363 ) I know its a challenge to make and install on
windmill blades to get everything lined up perfectly! I have it
close . While making the ring I was also trying to make this
windmill light, so there are a lot of changes that took may
attention away from the ring, But I think it will work , time
will tell . I may have to let @LW take it home to test.
#Post#: 5274--------------------------------------------------
Re: Newbie questions....turbine design
By: maximoney1 Date: January 28, 2015, 4:54 am
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thanks SUT, off to see reply 363 ;D
#Post#: 5285--------------------------------------------------
Re: Newbie questions....turbine design
By: maximoney1 Date: January 28, 2015, 6:49 pm
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@lynx
In a previous design you made(not the current airfoil design)
you seemed to have a shroud with fixed vanes all around the
turbine rotor, i'm assuming it is detrimental shrouding the
airfoil design? Am i right to presume it creates too much
turbulent airstream to allow the airfoil blades to work
properly?
Thanks again.
jim.
#Post#: 5286--------------------------------------------------
Re: Newbie questions....turbine design
By: lynx wind Date: January 28, 2015, 7:31 pm
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That was long ago and my first effort at using lift. It was a
dud, but very mesmerizing to watch turn. Max rpm was maybe
60-90
The shrouding actually hurt more than it helped. And way too
many blades. Sometimes things that go around don't make power.
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