This idea on the surface, looks like it would work, but having the 'counter pressure cowling' will inhibit flow through the turbine and also cause compression and turbulence within. It will run at tsr less than 1.
Thanks for the reactionYou are right, of course , it will always run slower than TSR 1 (it' a "drag" turbine with "some" lift)But !! a well calculated airgap between the counterpressure shield and the rotor minimises compressions at foils 6,7 & 8There is a very nice low pressure bulb behind the turbine (caused by the shield) that compensates the loss due to compression. (venturi vacuum suction effect)The rest is vortexing at TSR 1.8 inside the rotor and has a "reactor" effect on the inside of the airfoil. (see the CFD video) Once the (adjustable) tail is well regulated, the rotor runs very smootly end shows a TSR of +-1.1 (unloaded) and TSR 0.84 (loaded) and has more power than a Darrieus at TSR 3 (ore more)Also a "coincidental" phenomenon : the Terminator is "selfregulating" !!! ..ha..ha..(the higher the wind, the more the shield shuts down the rotor)That was a very "plezant" and "unexpected" phenomenon (where we had not counted on)The cP shows +- 0.42 at TSR +- 0.8 !!! (what is more than double of a Savonius and much more than the best NACA airfoil in a VAWT)This all taking into consideration.....if we can "trust" the CFD's ...ha..ha..This turbine is also a much safer that a Darrieus (a Darrieus need lots of wind to deliver some power and needs high TSR. It's also very demanding on the mechanics due to hughe centrifugal forces)One more not negligible advantage : In case of upcoming tornado's, you can easily "close" the rotor with the shield.(instead of expensive mechanical safety brakes)
I have no knowledge of building an efficient wind turbine, but I like this concept. Is there a way to calculate the width of the gap between the rotor and the reflecting shield? Thanks!
