Abstract
A commercial anemometer was modified by replacing the four cups with four identical two-dimensional blades, each with a circular arc side and a flat side. The flat sides are fixed to four arms radiating from a pivot so that they are parallel to the wind direction. The rounded sides all point in the same direction around a circle. When the wind blows, there is a lift force on the rounded side of each blade and they unite in causing rotation about the pivot with the curved sides leading. The more blades the faster the rotation is a prediction.
Highlights
Earlier a commercial anemometer was obtained and modified by replacing the cups with solid cones [1]
Four hemi-spherical cups were replaced by two double cones
Each double cone consisted of two cones of equal bases, joined base to base, but their altitudes were significantly different
Summary
Earlier a commercial anemometer was obtained and modified by replacing the cups with solid cones [1]. Each double cone consisted of two cones of equal bases, joined base to base, but their altitudes were significantly different They were identical but faced in opposite directions when attached to a frame which was placed horizontally on the vertical pivot. What drove the rotation in this case was a net reaction force on each double cone caused by the air accelerating and decelerating along the solid surfaces, in accordance with Newton’s third law [2]. This modification of the anemometer was designed in part to illustrate the driving force, which is not well-known and not obvious a priori. Each stick has a flat side and a rounded one and it is oriented on an arm of the frame such that the lift force felt on the rounded side by air passing by is coordinated adding impetus to the rotation
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
