NASA have got a Beginner's Guide to Aeronautics<http://www.grc.nasa.gov/WWW/K-12/airplane/index.html>that's worth looking at. It's includes a section on compressible aerodynamics <http://www.grc.nasa.gov/WWW/K-12/airplane/bgc.html>, which - as Peter points out - is not the regime that these turbines are operating in (as object speeds are much lower than speed of sound).
-- R P.S. Nick - meteorologists are saying just what you think they are: a cubic meter of air down here has a higher mass than a cubic meter of air up there. That NASA site has an interactive demo called Gaslab (at bottom here<http://www.grc.nasa.gov/WWW/K-12/InteractProgs/index.htm>) that enables you to explore the ideal gas law. On Fri, Nov 27, 2009 at 11:30 PM, Nicholas Thompson < [email protected]> wrote: > Yes. And while we are at it, what does it mean when meteorologists say > that air is more dense near the surface than higher up, or that cold air is > denser than warm? > > N > > Nicholas S. Thompson > Emeritus Professor of Psychology and Ethology, > Clark University ([email protected]) > http://home.earthlink.net/~nickthompson/naturaldesigns/<http://home.earthlink.net/%7Enickthompson/naturaldesigns/> > http://www.cusf.org [City University of Santa Fe] > > > > > > [Original Message] > > From: Marcus G. Daniels <[email protected]> > > To: The Friday Morning Applied Complexity Coffee Group < > [email protected]> > > Date: 11/27/2009 11:21:15 PM > > Subject: Re: [FRIAM] Hot Air, and Compressibilty > > > > [email protected] wrote: > > > > > > You have to sweep your hand at a speed comparable to that of sound > > > (about 330 m/s here on earth) in order stop the air from getting away > > > and to achieve any compression. > > > > > Ok, so in one of the articles mentioned, > > > > http://physicsworld.com/cws/article/news/40993 > > > > ..it said.. > > > > "What they found was that a staggered column of alternately clockwise- > > and anticlockwise-rotating turbines significantly enhances the speed of > > turbine rotation. The reason, they say, is that the presence of > > neighbouring turbines concentrates and accelerates the wind." > > > > The term `concentrate', to me, sounds like a synonym of `compress' but > > in any case `accelerate' could be true in any case. > > > > The authors of the work are Caltech aerodynamics guys, so if all you'll > > give us is, "Shut up and trust the experts", well... > > > > Is their claim impossible? > > > > Marcus > > > > > > > > > > > > > > > > > > > > ============================================================ > > FRIAM Applied Complexity Group listserv > > Meets Fridays 9a-11:30 at cafe at St. John's College > > lectures, archives, unsubscribe, maps at http://www.friam.org > > > > ============================================================ > FRIAM Applied Complexity Group listserv > Meets Fridays 9a-11:30 at cafe at St. John's College > lectures, archives, unsubscribe, maps at http://www.friam.org >
============================================================ FRIAM Applied Complexity Group listserv Meets Fridays 9a-11:30 at cafe at St. John's College lectures, archives, unsubscribe, maps at http://www.friam.org
