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Author Topic: Turbine blade tips.  (Read 1852 times)

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cr8zy1van

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Turbine blade tips.
« on: July 27, 2005, 05:48:54 PM »
When I was younger my granddad owned a Cessna, and I remember them taking it to a
shop at great expense to have a kit installed on the wings that would allow for
shorter take off/landings. I remember that the tips were curved slightly
downwards, and they explained to me at the time that it helps keep more air under the wing to cause more lift.



Every turbine blade tutorial/picture/post/website shows pretty basic tips on ends.
Would something like a lip cause more lift/efficiency? I could not find the
exact kit they had but did find this interesting picture...



Has anyone spent any time looking into this or something similar?
« Last Edit: July 27, 2005, 05:48:54 PM by (unknown) »
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wdyasq

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Vortex killers
« Reply #1 on: July 27, 2005, 12:21:50 PM »
« Last Edit: July 27, 2005, 12:21:50 PM by wdyasq »
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niffa

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Re: Vortex killers
« Reply #2 on: July 27, 2005, 01:41:03 PM »
Excellent link thanks

You seem to be the site oracle, has the idea of using a ducted fan arrangement to enable higher tip speeds with less noise and vortex losses been discussed. I got no hits from a site search.
« Last Edit: July 27, 2005, 01:41:03 PM by niffa »
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cr8zy1van

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Re: Vortex killers
« Reply #3 on: July 27, 2005, 02:32:03 PM »
Thank you for the link, it helped a lot. It would appear that the right tip can significantly increase performance. Now I just have to figgure out what im going to make it out of, and how to duplicate.
« Last Edit: July 27, 2005, 02:32:03 PM by cr8zy1van »
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rotornuts

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induced drag
« Reply #4 on: July 27, 2005, 11:35:51 PM »
Here's a photo I've always liked that illustrates the tip vortex.





The size of the vortex is exagerated because the plane is flying at a very low altitude, well within "ground effect".


Also see the link below for more good info


http://142.26.194.131/aerodynamics1/drag/Page6.html


Mike.

« Last Edit: July 27, 2005, 11:35:51 PM by rotornuts »
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ghurd

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Re: induced drag
« Reply #5 on: July 28, 2005, 12:50:18 AM »
It is just crazy you would even have a photo like that,

let alone always liked it!  :)

G-
« Last Edit: July 28, 2005, 12:50:18 AM by ghurd »
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Warrior

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Re: induced drag
« Reply #6 on: July 28, 2005, 05:31:22 AM »
That picture is from Popular Science magazine!!! I have the issue and they were analyzing the posibility of wing tip turbines able to use the energy these vortex create. The turbines were either going to drive hydraulic pumps or electric gennys :)


Warrior

« Last Edit: July 28, 2005, 05:31:22 AM by Warrior »
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Why can't Murphy's Law be used to my advantage?

finnsawyer

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Re: induced drag
« Reply #7 on: July 29, 2005, 09:53:32 AM »
O.K. So where's the similar picture showing the effect of adding winglets.  Why do they always do half the job?
« Last Edit: July 29, 2005, 09:53:32 AM by finnsawyer »
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