Quote:
Originally Posted by Logic
The "tip off"?
Where?
As far as I could see they did an OK job of their experiment..?
Then the 2nd link really got my attention as the electron flow is in one direction vs AC DBDs.
DBD Plasma Actuation on the Blades of Axial-Flow Turbomachinery
Abstract
Flow separation, or stall, in axial flow turbomachinery results in a loss of pressure or compression in the case of fans and compressors, or the loss of power or thrust generation in the case of turbines. Wave-power-based Wells turbines, in particular, suffer so acutely from blade stall during normal operation, that it compromises their viability as a major renewable energy resource. In this research, pulsed dielectric barrier discharge (DBD) plasma actuators were implemented on the blades of a mono-plane Wells turbine impeller and its full-bandwidth performance was evaluated. An initial parametric study indicated that blade-tip reduced frequencies ≥2.5 produced the greatest impeller acceleration from rest. The corresponding physical pulsation frequency was then used as a basis for conducting nominally steady-state experiments as well as experiments involving acceleration and deceleration of the impeller. Data so acquired, corresponding to a reduced frequency range of 0.9 to 2.5, was compiled to construct an impeller performance map. Plasma pulsations dramatically increased the effective impeller bandwidth by producing useful net power well beyond flow ratios where mono-plane impellers spin down to a standstill. In fact, the shaft power at a 17° blade-tip angle of attack exceeded the plasma input power by a factor of 33. These findings are potentially game-changing for wave energy generation and axial flow turbomachinery in general.
https://link.springer.com/chapter/10...030-90727-3_16
A factor of 33 at an angle of attack of 17 degrees..!
How does this stuff not get your interest?
17 degrees with no stall/turbulence means a way shorter tail for a vehicle.
One might also encourage a air direction change on the high pressure area of a vehicle's nose. |
1) Aerodynamic drag is closely associated with 'Boundary-Layer-Theory.'
2) The very fact that the investigators reported the Reynolds number that they did belies the fact that they haven't a clue about aerodynamics or fluid mechanics.
3) Their findings are 'trash'.
4) It won't prevent them from achieving a Ph.D. though, as people who are completely 'wrong' about physics can get Ph.D.s any day of the week!