Abstract: This chapter discusses the theory of the vane anemometer and its usage. To apply the results of the theoretical analysis that follows to predict the behavior of the vane anemometer in various working conditions, some knowledge is required of the aerodynamic forces acting on small flat plates. An anemometer is generally used to measure air speeds appreciably higher than the lowest speed that will just set the vanes in rotation. In these circumstances, the readings of a well-made anemometer, in which the frictional resistance is very small, do not usually require correction for changes in air density corresponding to normal changes in atmospheric pressure and temperature. However, the vane anemometer measures a local velocity which, subject to the limitations, may be taken as the velocity of the filament of air passing through the center of the vane wheel. Therefore, to determine the quantity of air flowing along a pipe by the use of this instrument, readings must be taken with the axis of the vane wheel at the points at which the velocity head would be observed if a pitot-static tube were being employed for the purpose.
Publication Year: 1977
Publication Date: 1977-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
Access and Citation
Cited By Count: 6
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