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
///
/// land-speed@autox.team.net mailing list
///
|