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Tunnel ventilation question
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[quote user="Convicted One"][quote user="selector"] <p>but I would have thought the very trains, themselves, would do a passable job of running cleansing air through the tunnels when the locomotive had passed in the lead. Each car front acts like a mini-impeller blade as it enters the lead portal and encourages a bowshock of air to move ahead of it as it makes its passage along the tube. Or, so it would seem natural to hope. So, why doesn't it?</p><p> </p><p>[/quote]</p><p> </p><p>"piston effect" is what they call it, and you are absolutely correct.</p><p>They also had tricks such as making one portal of the tunnel higher than the other, to make the entire structure 'breath" like a giant chimney.</p><p>[/quote]</p><p>Here is a little pistion effect being demonstrated by a coal train coming out of Mullan Tunnel as beaulieu mentioned. I posted this once before in another thread on smoke, but it fits here and is fun to watch (unless you are Al Gore).</p><p><a href="http://www.youtube.com/watch?v=H-ztLI8op04&mode=related&search">http://www.youtube.com/watch?v=H-ztLI8op04&mode=related&search</a>=</p><p>Turn up the sound.</p>
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