Use of anemometer

The anemometer's use of an anemometer is an instrument for measuring the air flow rate. The basic principle is to place a thin wire in a fluid and heat the wire to a temperature higher than the temperature of the fluid. The wire is called "". When the fluid flows through the wire in a vertical direction, a portion of the heat of the wire is removed, causing the temperature of the wire to drop. According to the forced convection heat exchange theory, it is possible to derive a relationship between the lost heat Q and the velocity v of the fluid. The standard probe consists of two brackets that tension a short, thin wire. How to use the anemometer 1. Before using, observe whether the pointer of the meter refers to the zero point. If there is any offset, you can gently adjust the mechanical adjustment screw of the meter to return the pointer to zero point; 2. Place the calibration switch in the off position; 3. Insert the measuring rod plug into the socket, the measuring rod is placed vertically upwards, the screw plug is pressed tightly to seal the probe, the “correction switch” is placed at the fullness position, and the “full-scale adjustment” knob is slowly adjusted to make the meter pointer In the full position; 4, put the "correction switch" in the "zero position", slowly adjust the "coarse adjustment", "fine adjustment" two knobs, so that the meter pointer points to the zero position; 5, through the above steps After that, gently pull the screw plug to expose the probe (the length can be selected as needed), and make the red point on the probe face the wind direction. According to the meter reading, check the calibration curve to find the measured wind speed. ; 6, after measuring a few points (about 10min), must repeat the above steps 3, 4 once, so that the current in the meter is standardized; 7, after the test, the "correction switch" should be placed in the broken position. The main purpose of an anemometer is to measure the speed and direction of the average flow. 2. Measure the pulsation velocity of the incoming stream and its spectrum. 3. Measure the Reynolds stress in the turbulent flow and the speed dependence and time dependence of the two points. 4. Measure the wall shear stress (usually by using a hot film probe placed flush with the wall surface, the principle is similar to the speed measurement). 5. Measure the temperature of the fluid (measuring the curve of the probe resistance with the temperature of the fluid in advance, and then determining the temperature based on the measured resistance of the probe. In addition, the use of an anemometer is also developed.

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