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Article #37Re: Substation spacing - 3rd rail
From: tony sayer
Date: Wed, 11 Sep 2002 19:49
Date: Wed, 11 Sep 2002 19:49
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2661 bytes
In article <d3979d5f.0209111108.4634cd7@posting.google.com>, Richard Catlow <RBCatlow@aol.com> writes >Tony Sayer asked >> >> Another very interesting bit of reading. Can you explain why the tunnel >> would be significant please?. Is it to do with wind resistance perhaps. >> >The rolling resistance of a vehicle is governed by a number of factors >called Davies coefficients in the form a+bv+cv^2 > >Where a= static resistance of train to motion i.e. stiction >b= rotary intertia >c= aerodynamic drag >v= velocity > >Thus a train in a tunnel has a higher c element of the equation as the >turbulent air flow of the train interacts with the tunnel. The actual >drag in a tunnel depends upon bore size, whether there is oncoming >traffic in the same bore, speed, uniformity and smoothness of the >tunnel bore surface, tunnel length, whether there are vents and their >physical location etc. It all makes an interesting computational fluid >dynamics problem, even more so if you have to control smoke flows as >well. I spent a little time working for the CFD guru who looked at >these problems for the Channel Tunnel - very absorbing it was too. > >Richard Catlow Thanks for that!.... -- Tony Sayer
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fb12d,4a0592ad45abdc07 X-Google-Attributes: gidfb12d,public X-Google-Thread: 11469f,4a0592ad45abdc07 X-Google-Attributes: gid11469f,public X-Google-Thread: 10befb,4a0592ad45abdc07 X-Google-Attributes: gid10befb,public X-Google-Thread: f73ba,4a0592ad45abdc07 X-Google-Attributes: gidf73ba,public X-Google-ArrivalTime: 2002-09-11 12:50:00 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!canoe.uoregon.edu!arclight.uoregon.edu!news.uni-stuttgart.de!news.belwue.de!newsfeed01.sul.t-online.de!t-online.de!newspeer1-gui.server.ntli.net!ntli.net!newsfep2-gui.POSTED!53ab2750!not-for-mail Message-ID: <zXCPrXDN55f9EwDt@bancom.co.uk> From: tony sayer <tony@bancom.co.uk> Newsgroups: uk.rec.models.rail,uk.railway,uk.transport.london,aus.rail Subject: Re: Substation spacing - 3rd rail References: <MPbf9.3193$Sr6.110768@ozemail.com.au> <d3979d5f.0209101145.1a1d5a7f@posting.google.com> <r7JJQhAiclf9EwiR@bancom.co.uk> <d3979d5f.0209111108.4634cd7@posting.google.com> Lines: 33 Organization: tony MIME-Version: 1.0 X-Newsreader: Turnpike Integrated Version 5.01 U <ZaNL+lurdRr63ec8tiXlvIfpxH> Date: Wed, 11 Sep 2002 20:49:33 +0100 NNTP-Posting-Host: 80.2.247.149 X-Complaints-To: abuse@ntlworld.com X-Trace: newsfep2-gui 1031773799 80.2.247.149 (Wed, 11 Sep 2002 20:49:59 BST) NNTP-Posting-Date: Wed, 11 Sep 2002 20:49:59 BST