Toppless Mud Wrestling

INCONSISTENCIES

Correct existing classical concepts in traditional literature supported by misconceptions that have existed for decades is not easy unless the foundations used to be absolutely objective, undeniable and so obvious as to deny the proposed rectification constitutes an unpardonable folly. This is the case of the theoretical optimization of the parameters force, torque and power of the propeller turbines, first and most important phase of the wind machine design.

In fact, classical literature, globally accepted and used as the basis for interpretation of aerodynamic phenomena, it incorporates the ratio v / u, ie the ratio between the tangential velocity profile and wind speed with the intention of simplifying the analysis called l _x (lambda).

The determination of the torque and power, as we saw in the preceding paragraphs, until this happened adhere strictly to the physics and classical mathematics. However the next step is to seek the maximum power it is suggested, with the help of differential calculus to derive the function representative and equal to zero. But upon arriving at this stage as constant coefficients of lift C L , push C D and L / C whose values \u200b\u200bcorrespond precisely to the variable that is to be used as the basis of derivation. The classical differential calculus does not consider these coefficients as constants and therefore the operation is inaccurate as it is intended. It is easy to prove, thirty years ago, no Excel, Quatro etc. and without the current PC with gigabytes of memory, the process was so laborious that better not think of embarking on this.

Today, ten minutes are enough for combining the adequate data, the accuracy and speed of the calculations give the ground with conclusions based on shallow foundations.

Get the maximum torque of the formula,

simplified to give:

, admitted that:

because the error is not significant given that V / u only takes significant values, means recognizing that the maximum torque is achieved when

Normal

and that the pair is:

Just calculate the number of values \u200b\u200bfrom to = 30 to to = -8 (available for any NACA), and draw the curves, strictly accurate, to verify that neither is true otherwise. Moving from the function when the power function means talking in those terms, why we leave the reader that step, if we have given are based on categorical enough.

However, as we said at the beginning, from more than 30 years the classical literature using this misconception, without verifying the results, involving not only practical physical construction elements, using the wind tunnel, and the distraction of many hours of testing, but no theoretical verification of the results for the simple representation graph of the functions in a Cartesian diagram, which we mentioned test exempt.

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Mr. Enrique O. Nielsen

www.windywest.com.ar

windywest@ssdnet.com.ar