John,
Thanks for the reply. My liner comes together gradually at the rear with a
1" vertical slot which I hope is a low pressure area to promote airflow thru
the car. I don't think I will need them there but was thinking about maybe
just behind the curve of the nose or canopy where the flow may seperate. The
guy I bought them from said they work good in front of NACA ducts and
improve their efficiency when they are not in a high pressure area.
Obviously I have a lot of experimenting to do.
Howard
----- Original Message -----
From: "John Goodman" <ggl205@swbell.net>
To: <land-speed@autox.team.net>
Sent: Saturday, February 24, 2001 3:08 PM
Subject: Vortex generators
> Howard:
>
> As I understand them, vortex generators serve to speed air up on areas of
a surface
> that require it. If they are placed vertically at the extreme end for a
liner, as
> with Jack's car, the attempt is to accelerate air flow leaving the abrupt
tail
> section so that it may smoothly reattach farther back in the air stream
without
> turbulence. If it works, baseline drag is reduced. The only thing I don't
understand
> is why you would need two offset vertical rows of generators? Even a
single row
> should work if placed a small distance from the exiting end of the tail.
>
> John
>
> Date: Fri, 23 Feb 2001 14:31:27 -0700
> From: "Nafzger" <nafzger@vtc.net>
> Subject: Re: boy i got it bad!
>
> Paul,
> Boy do I understand. I wish I knew more about that stuff myself. I also
have
> a stack of books on aerodynamics and fluid dynamics under the night stand
in
> the bedroom. I am a true amateur but always trying to learn more. I have
a
> miniature camera mounted op on top of the vertical fin on my car. It feeds
a
> 12v. VCR in the cockpit. I'm going to use black yarn and maybe some oil on
> the car so I can see what the air is doing at speed I purchased some small
> vortex generators that can be taped or super glued on the car to try and
> address problem areas.
> As I understand it, vortex generators themselves cause drag but they also
> re-attach separated airflow so the total effect could be positive if they
> are only used where needed. Hopefully I can find out where they are needed
> with the camera and some oil trails.
> If I'm all screwed up, speak up guys,
> Howard
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