Question

Precautions for anemometer

Answer 1

Anemometer (anemometer) suggests that it is an instrument for measuring air flow rate. The basic principle is a thin metal wire on the fluid, through the current heating wire, its temperature above the fluid temperature, so the wire as hotline. When the fluid flow along the vertical wire, it will take away part of the heat wire, so that the temperature drop wire. According to theory of forced convection heat exchange, heat loss can be derived Hotline Q and velocity of the fluid relationship between v. The standard hot probe by the two brackets tensioning a short composition of thin metal wire. To use an anemometer, observe the meter pointer before using it means the zero point, if offset, gently adjust the meter's mechanical adjustment screw, so the pointer back to zero; 2, switch off the correct position; 3, the measuring rod plug in the socket, place the measuring rod straight up, plug the probe seal compression, full-scale calibration switch position, and slowly adjust the full scale adjustment knob, so that means a full-scale meter pointer position ; 4, the correction switch to zero, and slowly adjust the coarse and fine tune the two knobs, so that the meter pointer refers to the zero position; 5, the above steps, gently pull the plug, the measuring rod probe exposed (the length can be selected), and to the red dot on the face of the probe against the wind, according to the meter scale reading, check the calibration curve, you can identify the measured wind speed; 6, in the determination of several minutes after (10min or so) , one must repeat the above steps 3,4, so that the current instruments are standardized; 7, test completion, should switch off the correct position. The main purpose of an anemometer to measure the average flow speed and direction. 2, the pulse rate of flow measurements and its spectrum. 3, the measurement of Reynolds stress and turbulence in the two speed-related, time related. 4, measuring wall shear stress (usually flush with the wall using the hot-film probe placed to carry out, the principle of similarity with the hot ***). 5, to measure the fluid temperature (pre-probe resistance measured with the fluid temperature curve, and then measured the temperature sensor resistance can be determined.
    

Answer 2

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