errors in wind run estimates from rotational anemometers

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  • 1 National Center for Atmospheric Research , Boulder, Colo. 80303
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It is common practice to compute wind run and mean wind by counting the total number of anemometer rotations in a measured time. The practice assumes that each turn of the rotor signifies the passage of a fixed run of wind, or that the anemometer's performance is expressed by S = bR, where S is wind speed in meters per second, b is a coefficient with units of meters per revolution, and R is the turning rate in revolutions per second. Tests in NCAR's wind tunnel show that, although true helicoid anemometers obey the equation S = bR, all other types of rotational anemometers obey the equation S = a + bR. The significance of errors due to this oversight is discussed.

1 The National Center for Atmospheric Research is sponsored by the National Science Foundation.

It is common practice to compute wind run and mean wind by counting the total number of anemometer rotations in a measured time. The practice assumes that each turn of the rotor signifies the passage of a fixed run of wind, or that the anemometer's performance is expressed by S = bR, where S is wind speed in meters per second, b is a coefficient with units of meters per revolution, and R is the turning rate in revolutions per second. Tests in NCAR's wind tunnel show that, although true helicoid anemometers obey the equation S = bR, all other types of rotational anemometers obey the equation S = a + bR. The significance of errors due to this oversight is discussed.

1 The National Center for Atmospheric Research is sponsored by the National Science Foundation.

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