Talking about the wind speed and direction sensor of the method of measuring wind speed and wind direction
Wind speed refers to the distance the wind flows in a unit time; wind refers to the strength of the wind when it blows on an object. Wind speed has no grade, only wind has a grade, and wind speed is the basis for the division of wind grades. Generally speaking, the higher the wind speed and the higher the wind level, the greater the destructive power of the wind. 1. Why should we emphasize wind speed and wind measurement? Wind force and wind speed are important indexes for meteorological research, and they are also key elements that people pay attention to. It not only has a great impact on people's daily activities, but also has more important significance for meteorological research, navigation and other work. Therefore, measuring the wind speed and direction in advance is conducive to the smooth development of various activities. Two. What methods are there to measure wind speed and direction? According to the measurement principle, I will introduce the following methods: traditional measurement, mechanical, ultrasonic, and calorimetric, etc. Traditional measurement method1. Wind direction measurement: Use the wind vane to indicate which direction the wind direction arrow of the pair of wind vanes points to, which indicates the direction of the wind at that time. When there is a certain angle between the wind vane and the airflow direction, the airflow generates a pressure on the wind vane tail. Its size is proportional to the projection of the geometric shape of the weathercock on the vertical plane of the airflow direction. The head of the weathercock has a small windward area and the tail wing has a large windward area. This pressure difference generates wind pressure to make the weathercock rotate around the vertical axis until the weathercock and the airflow Parallel. The wind direction can be easily observed from the relative position between the weather vane and the fixed main azimuth indicator. 2. Wind speed measurement: use an anemometer There is a rectangular wind pressure plate on the wind pressure plate, and an arc-shaped frame is installed next to the wind pressure plate with long and short teeth on the frame. The number of long and short teeth that the wind pressure plate raises indicates the magnitude of the wind. The greater the wind, the higher the wind speed level. Mechanical wind measurementMechanical wind measurement is like a wind meter to measure wind. It looks like a mechanical watch and is generally used to measure the wind in a well. You need to estimate the wind speed first, and then use the wind indicator and stopwatch to reset the wind meter pointer and the stopwatch to zero, and then make the wind meter face the wind flow and perpendicular to the wind flow direction. After the wind meter idling for 30 seconds, turn on the wind meter and stopwatch switches at the same time to start the measurement. . It should be noted that the wind measurement on the same section is not less than 3 times, and the wind measurement process should run smoothly. For example, the wind speed and direction sensor adopts a typical mechanical wind measurement method, which makes better use of wind energy and supports the development of new energy wind power technology. Ultrasonic speed measurement method The working principle of ultrasonic wind measurement is to use the ultrasonic time difference method to measure wind speed and direction. Due to the propagation speed of sound in the air, it will be superimposed with the airflow speed in the wind direction. If the propagation direction of the ultrasonic wave is the same as the wind direction, then its speed will increase; conversely, if the propagation direction of the ultrasonic wave is opposite to the wind direction, then its speed will slow down. Therefore, under fixed detection conditions, the speed of ultrasonic propagation in the air can correspond to the wind speed function. The wind speed and direction can be obtained by calculation. Calorimetric principle measurement method A typical example of measuring wind speed using calorimetric principle is an anemometer. The basic principle is to put a thin metal wire in a fluid and apply current to heat the metal wire. Make the temperature higher than the temperature of the fluid, so the wire anemometer is called the 'hot wire'. When the fluid flows through the metal wire in the vertical direction, it will take away a part of the heat of the metal wire, and the temperature of the metal wire will drop. According to the theory of forced convection heat exchange, it can be derived that there is a relationship between the heat Q lost by the heating wire and the velocity v of the fluid. An anemometer is an instrument that can measure low wind speeds. It consists of two parts: a hot ball probe and a measuring instrument. The probe has a glass ball with a nickel-chromium wire loop and two thermocouples around the ball. The cold end of the thermocouple is connected to the phosphor bronze pillar and is directly exposed to the airflow. When a certain amount of electric current passes through the heating ring, the temperature of the glass ball rises. The degree of increase is related to the wind speed. When the wind speed is small, the degree of increase is large; on the contrary, the degree of increase is small. The magnitude of the increase is indicated on the electric meter through a thermocouple. According to the reading of the electric meter, check the calibration curve to find out the current wind speed.
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