Power to space use ratio

[PierreB]

Since the document entitled The Betz limit applied to Airborne Wind Energy was also discussed on the current topic (here Power to space use ratio), I report my comment from the initial topic.

@PierreB

I would like to congratulate the authors (listed below) on their brilliant demonstration, including the 4/27 limit for the reeling (said “lift”) mode, for the document entitled The Betz limit applied to Airborne Wind Energy which is at the heart of the (current) topic on Betz limit and power available in the wind.

Everything I’ve read is logical and flows smoothly, especially from Figure 5 onwards, which describes the characteristics (curves of the thrust _ with a maximal value of 1 and a value of about 0.9 at Betz limit _ and power coefficients) that “are well accepted in academia and industry as an idealization of a turbine’s behavior, i.e. an upper bound for its efficiency.”

The deductions for AWE lift power systems (“ideal airfoils” exerting a pull (thrust) in their crosswind figure-eight trajectories.) are intelligently issued.

Marcelo De Lellis, Romeu Reginatto, Ramiro Saraiva, Alexandre Trofino

I still have much to learn about this wonderful document.

This document could have positive repercussions by facilitating the choice of a generation method in relation to crucial issues (if AWES develop) such as Power to space use ratio among other possible issues.