In contemporary windmills having 3 blades, 95% of wind energy goes waste as wind passes between blades. Why?

Question

Three blade windmills revolving around a hirzontal axis waste lot of wind energy as wind passes through hollow portion between blades. Can the machine be made more efficent using maximum possible wind energy?

Answer 1

Modern wind turbines can operate at efficiencies up to about 44% while the theoretical maximum efficiency is about 56%. Tower height is very important and for a three-bladed system, increasing blade diameter increases power exponentially. The wind is free but designs are optimized to increase efficiency to produce maximum energy for the installation cost.

Answer 2

If the wind is offered too much resistance, laminar flow will be interrupted, and wind will be re-directed around the windmill. I suppose the 120°-spacing makes sure that the following blade would not encounter the turbulences by the earlier one.

There's also a problem with offering too much wind resistance at high wind speeds. Contemporary mills still work fine at wind strengths of 11-12 Beaufort, where multi-bladed mills simply are toppled.

Answer 3

to physique your question in a diverse way, why no longer have "infinity" blades on the mill with the intention to get "infinity" situations the flexibility output. of course this would't be the case, otherwise one windmill might ability the earth. So what's the respond to your question? the respond is that there is a compromise to be reached and the main suitable variety of blades lies someplace between a million and infinity. yet between the excuses that the optimum quantity is so low is as a results of the fact at a undeniable factor, too many blades can start to make the wind divert around the mill rather of blowing with the aid of it. If there is too lots floor section interior the circle defined by ability of the blades, wind will re-course around the circle and capability heavily isn't captured. there is likewise the reality that turbulence is a ability-decrease. If there have been too many blades, the small amout of turbulence brought about by ability of a premier blade might shrink the flexibility generated by ability of a following blade. by ability of having solid spacing, the turbulence is blown in the back of right here blade, and would not impact capability capture. There are a number of different motives that would desire to do with: preliminary installation expenditures, upkeep, angular momentum, finished mass of shape, and as you stated windforce on the tower.

Answer 4

Because the blades only take up 5% of the theoretical space.