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the effect shaft size has on vorticity

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Old   July 14, 2016, 10:13
Unhappy the effect shaft size has on vorticity
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david glynn
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Hi Folks,

apologise if this is the wrong place to put my question but I would be grateful if some of you could lend me your expertise.

I have currently trying to design a central shaft for a vertical axis tidal turbine, I am happy with the calculations for deflection and stress etc. however what I am not able to evaluate is the effect my chosen shaft diameter will have on the downstream blades via vorticity.

I am aware that the larger my shaft the larger my Reynolds number will be and this has a direct relationship with turbulence, I have also come across that the Strouhal number has a big contribution to play here and the critical St of 0.21

the approach I am considering using is takingthe maximum design RPM of the turbine converting to Hertz and using it as my oscillation frequency in the Strouhal equation and playing around with the d value? or is this ludicrous

if anyone has an experience in this analysis please share.

Thanks in advance,
Dave
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fluids, reynolds number, shaft dynamics, strouhal number, vorticity

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