LYCOS RETRIEVER 
Turbine
built 649 days ago
Turbine designs will use both these concepts to varying degrees whenever possible. Wind turbines use a foil to generate lift from the moving fluid and impart it to the rotor (this is a form of reaction), they ... gain some energy from the impulse of the wind, by deflecting it at an angle. Crossflow turbines are designed as an impulse machine, with a nozzle, but in low head applications maintain some efficiency through reaction, like a traditional water wheel. Gas turbines with multiple stages have the first stage reacting to impulse of the gas flow (because it is inefficient to increase the velocity when it is almost at the speed of sound) and later stages being designed for reaction in the decreasing velocity flow. Blades in many stages being arranged to be reaction over some parts (of their length) and impulse over the rest.
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Turbine designs will use both these concepts to varying degrees whenever possible. Wind turbines use an airfoil to generate lift from the moving fluid and impart it to the rotor (this is a form of reaction). Wind turbines ... gain some energy from the impulse of the wind, by deflecting it at an angle. Crossflow turbines are designed as an impulse machine, with a nozzle, but in low head applications maintain some efficiency through reaction, like a traditional water wheel. Turbines with multiple stages may utilize either reaction or impulse blading at high pressure. Steam Turbines are usually more impulse while Gas Turbines more reaction type designs.
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License Turbine 1.0 is Copyright © 2003 by Brandon Gillespie. It is currently available for general non-commercial use with the GPL License. Access is on an as-is as-available basis, no support is provided.
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The Turbine is offered as one body style - a four-passenger, 2-door hardtop. The exterior and interior are turbine bronze. Power steering, power brakes, power window lifts, automatic transmission, and all other available equipment are standard.
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Obviously, the wind will stop flowing through such a turbine. The opposite of that is that if you don't capture any energy in the wind, you don't need a turbine. The wind is able to flow around any major obstruction. The Betz limit says that essentially, if you capture 59.6% of the energy in the wind, that is the best compromise between stopping the air and forcing it to go around your machine. You need to maintain the flow of air, that's the compromise any wind machine must make whether it is a horizontal axis (traditional style turbine) or vertical axis turbine, with many blades or few, or any such combination. It's covered by the Betz limit.
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The Turbine program runs under Windows 98/2000/XP or any later compatible version. Once it is installed it requires only 300 kb of disk space. The current version is 2.2 and is dated August 2007.
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