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How to use an anemometer to measure wind speed?

How to use an anemometer to measure wind speed?

2021-04-09


An anemometer is an instrument for measuring the velocity of air. There are many kinds of anemometer. The commonly used one in meteorological stations is the wind cup anemometer, which consists of three empty parabolic cone cups fixed on the bracket at 120° each other to form the induction part, and the concave surface of the empty cups is in the same direction. The whole induction part is installed on a vertical axis of rotation. Under the action of wind force, the wind cup rotates around the axis with a speed proportional to the wind speed. Then, how to use an anemometer to measure the wind volume and wind speed? Please see the below instruction for reference.


Anemometer use:

1. Check whether the fan is in normal operation before testing, and must measure the size of the tuyere and air duct to be measured on the spot.

 

2. For unidirectional flow (laminar flow) clean room, the air volume is determined by the product of the average wind speed of the room section and the clean product.

 

(Take the section of the filter 0.3m perpendicular to the airflow as the sampling section, set no less than 5 test points on the section according to the distance between test points should not be greater than 0.6m, and take the arithmetic mean of all readings as the average wind speed.)The vertical unidirectional flow (laminar flow) clean room is determined by the horizontal section of 0.8m ~ 1m on the ground. The horizontal unidirectional flow (laminar flow) clean room is determined by the vertical cross section of the air supply surface of 0.5m ~ 1m; The number of test points on the section should not be less than 10, the spacing should not be greater than 2m, evenly arranged;

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3. For the tuyere with filters, the air volume is determined by the product of the average wind speed of the tuyere section and the net cross-sectional area of the tuyere. (The average wind speed is obtained by not less than 6 evenly arranged test points on the tuyere section or the section referring to the auxiliary air duct.)

 

4. When there is a long branch section on the upwind side of the tuyere and holes have been or can be punched, the air duct method can be used to determine the air volume. (Before the outlet, punch holes not less than 3 times the pipe diameter or 3 times the edge length;)

 

5. For rectangular air ducts, the measured section is divided into several equal small sections, each small section is as close to a square as possible, the length of the side is not greater than 200mm, the test point is located in the center of the small section, but the whole section should not be less than 3 test points; For the circular duct, the measuring section and the number of test points should be divided according to the equal-area ring method. Cut a hole in the outer wall of the air duct and insert a thermal anemometer probe or a pitot tube. (By measuring the dynamic pressure, converted to air volume.)

 


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