Do you understand how an anemometer works?
Do you know what the principle of anemometer is? Maybe many people have seen anemometers in their lives, especially on the roofs of some modern farms, there will be these equipments to test the weather. If you are interested, follow Zhenkunxing to learn more information.
1. Introduction to anemometer
An anemometer, as the name implies, is an instrument for measuring air velocity. There are many kinds of it. The most commonly used one in meteorological stations is the wind cup anemometer. It is mainly composed of three parabolic cone empty cups fixed on the bracket at 120° to each other to form the sensing part. The concave surfaces of the empty cups are all in one direction. The whole induction part is installed on a vertical rotating shaft, and under the action of wind force, the wind cup rotates around the shaft at a speed proportional to the wind speed.
2. The principle of anemometer--advantages
The anemometer has many advantages, the following is a few more important ones compiled by the editor for you, come and browse:
1. Small size, little interference to the flow field;
2. Wide range of application. It can be used not only for gas but also for liquid, and can be used in subsonic, transonic and supersonic flow of gas;
3. High measurement accuracy and good repeatability. The disadvantage of the hot wire anemometer is that the probe interferes with the flow field, and the hot wire is easy to break.
4. In addition to measuring the average speed, it can also measure the pulsation value and turbulence; in addition to measuring the movement in one direction, it can also measure the speed components in multiple directions at the same time.
3. Principle of anemometer
The anemometer mainly uses the calorimetric principle to measure the wind speed. The basic principle is to put a thin metal wire in the fluid, and heat the wire with current to make its temperature higher than the temperature of the fluid. Therefore, the metal The wire anemometer is called a "hot wire". When the fluid flows through the wire in the vertical direction, it will take away part of the heat of the wire and reduce the temperature of the wire. According to the theory of forced convection heat exchange, there is a relationship between the heat Q lost by the hot line and the velocity v of the fluid.
4. Principle of Anemometer--Application
Anemometers are widely used and can be used flexibly in all fields. They are widely used in electric power, steel, petrochemical, energy-saving and other industries. There are other applications in the Olympic Games, sailing competitions, rowing competitions, and field shooting competitions. etc. need to use an anemometer to measure. The current anemometer is relatively advanced, in addition to measuring wind speed, it can also measure wind temperature and air volume.
