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I was recently reading about the Magnus Effect, and how it can be used to make efficient air turbines for power generation, and for a (boat) propellor.
If it can be used for a propellor, why not as a gas compressor?
[link]
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it doesn't look like a good design for producing a high differential of pressure such as you would have between the inlet and outlet of an air compressor. sorry. |
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to function efficiently at an increasing differential of pressure a compressor needs to be increasingly positive (resistant to back flow). A fan may be good at harnessing or producing a differential of a few psi from one side to the other but it cannot efficiently "pump" air beyond that point, the tendency of the air to simply leak back being greater than the blades can overcome. |
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Almost by definition an effective wind turbine is not going
to
be a good compressor. It's inherent in a turbine design
that
it is attempting to extract as much work as possible at the
lowest pressure differential. A 12 MPH wind, which is
about
where most turbines kick below 30 MPH, or .01 PSI.The
fastest propellor aircraft on record managed a forward
speed of 541 mph, a wind pressure of about 5 PSI.
Efficient energy extraction is not the reverse of efficient
compression. |
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I think this is a fantastic idea. Since the idea of Magus 'blades' is to emulate an aerofoil there should be no reason this can't work as an axial compressor. I should point out that a fan/propellor is a single stage compressor. Your pressure differential is always limited over one stage (particularly in aerodynamic compressors) |
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even if we eliminate the other complexities I still don't think that a bunch of these in series is going to be a superior compressor design. |
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