The wind measuring device installed in the anemometer tower includes anemometer, wind speed measuring device, wind vane sensor, wind measuring software, thermometer, barometer and hygrometer, etc.

1. Anemometer

Anemometer is used for measuring wind speed and wind pressure. Wind speed measuring instruments include rotary anemometers, heat-dissipating anemometers, acoustic anemometers, ultrasonic wind speed sensors, etc. The vast majority of wind farms usually use rotary anemometers. Rotary anemometers include wind cup anemometers and propeller anemometers. The wind cup anemometer is composed of 3 or 4 hemispherical or parabolic cone hollow shells. The cup-shaped anemometer is fixed on a three-pronged bracket that forms an angle of 120° or a cross-shaped bracket that forms an angle of 90° with each other, and the concave surfaces of the cups all face one direction. The entire cross arm is fixed on a vertical rotation axis. Under the action of wind, the wind cup rotates around the axis at a speed proportional to the wind speed. Another type of rotary anemometer is the propeller anemometer, which is composed of a three-blade or four-blade propeller, which is installed at the front end of a wind vane so that it can be aligned with the direction of the wind at any time. The blades rotate around a horizontal axis at a speed proportional to the wind speed.

Wind speed instrument is installed at various heights determined by the wind tower. In order to reduce the influence of the "tower shadow effect" of the anemometer tower on the wind speed measurement, the anemometer should be fixed on firm support horizontally extending from the anemometer tower body, and a certain distance should be kept from the tower body: truss structure measuring The wind tower is more than 3 times the plane size of the tower, and the tube-shaped wind tower is more than 6 times the diameter of the tower. The bracket of the fixed anemometer should be horizontally corrected. The angle between the bracket of the anemometer and the main wind direction of the wind measurement area is controlled at 30-90°.

In addition, the radiating anemometer uses the heat dissipation rate of a heated object to be related to the velocity of the surrounding air. This feature can be used to measure wind speed, but it is mainly used to measure small wind speeds. Acoustic anemometers have no rotating parts, have fast response, and can measure wind speed components in any specified direction, but the cost is too high. Rotary anemometers are generally used to measure wind speed.

2. Wind vane sensor

The wind direction sensor is the most common device for measuring wind direction, including single-wing type, double-wing type and streamline type, etc. The wind vane is generally a head and tail asymmetric balance device composed of four parts: tail, pointing rod, counterweight and rotating the main shaft. The centre of gravity is on the axis of the supporting shaft, and the entire wind vane sensor can swing freely around the vertical axis.

The wind vane sensor is installed at the determined height of the anemometer tower. It should be fixed on a solid beam that is more than 3 times the diameter of the truss structure wind tower and 6 times the diameter of the round tube structure wind tower, installed in the main wind direction (the beam is 90° to the main wind direction), and horizontally corrected. In addition, the wind vane should be corrected according to the local magnetic declination and installed in the actual "north" direction.

The wind direction is generally expressed in 16 directions, namely, North-North East (NNE), Northeast (NE), Northeast East (ENE), East (E), Southeast East (ESE), Southeast (SE), South-South East ( SSE), South (S), South South West (SSW), Southwest (SW), Southwest West (WSW), West (W), Northwest West (WNW), Northwest (NW), North North West (NNW), North (N) The wind is (C). The wind direction can also be expressed by an angle, taking true north as the reference and rotating clockwise, the east wind is 90°, the south wind is 180°, the west wind is 270°, and the north wind is 360°.

3. Wind measurement software

The main function of the wind measurement software is to record the wind speed, wind direction, temperature and atmospheric pressure measured by the wind tower in the form of data through sensors so that the wind resource engineer can perform subsequent analysis of the wind resource data.

Rika has professional wind measuring device for sale, such as wind speed sensors, wind direction sensor, etc.

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