This actually exists https://en.m.wikipedia.org/wiki/Vertical-axis_wind_turbine
this post was submitted on 02 Nov 2023
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Asklemmy
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Here's the specific bit relavent to OP's question:
VAWTs often suffer from dynamic stall of the blades as the angle of attack varies rapidly.
The blades of a VAWT are fatigue-prone due to the wide variation in applied forces during each rotation. The vertically oriented blades can twist and bend during each turn, shortening their usable lifetimes.
Other than the drag-types, VAWTs have proven less reliable than HAWTs,[20] although modern designs have overcome many early issues.
VAWT = vertical axis wind turbine
HAWT = horizontal ...
So HAWT in here!
So take off all your clothes!
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This has drifted so far away from the original question
Horizontal Axis WInd Turbines. So HAWT right now
I don't know why, the big fan is on
So TL;DR it's worth the extra bearing for the added efficiency unidirectional wind flow allows.
Didnβt one fall over a while back in NYC area?
They exist.
I guess it could be that it's easier to build. You have a tower that only gives structural support and you have a gondola that only deals with all the rotation. In general it is difficult to have something that rotates and also carries a large load. And the rotating gondola technology is a solved problem. Plus you have a large rotor area that is always facing the wind instead of half your blade area going opposite to the wind. These are just guesses though.
They aren't as efficient that way. Horizontal axis wind turbines most of the time have their whole "swept area" in unobstructed airflow. For vertical turbines the blades pass into the turbulent air from the other blades and the vertical post.
The swept area of a horizontal turbine is increases more for a given amount of additional blade length than a vertical turbine as well. Extending the radius of a circle creates more swept area than an equivalent increase of length or width of a rectangle.
they work best when the axis is parallel to direction of wind flow
I guess you would have to canalize the wind, cause it would press against the entire wheel. In which direction should it turn when you don't want to construct something more complex to have more pressure on only one side of the wheel.