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The use of pitot anemometer

by:HoldPeak     2020-06-09
Pitot anemometer: the use of the pitot tube wind speed meter is mainly with the wind tunnel laboratory experiments. Under the guidance of the teacher, the students understand the principle, instrument performance and operation method, the wind tunnel experiment period of actual measurement; The test for the part of the research projects. Pitot anemometer velocity signal into electrical signal a speed measuring instrument, also can measure fluid temperature or density. Its principle is that the thin wire of a electric heat ( Said) Put in air, heat dissipating capacity is related to flow velocity in the air, and temperature change caused by the resistance resulting from heat dissipating capacity of the velocity signal is transformed into electrical signals. There are two work modes: (1) the constant flow. Through current remain unchanged, the temperature changes, the resistance to change, and both ends of the voltage changes, the measured velocity; (2) the thermostat. Temperature remains the same, such as 150 ℃, applying current can be measured according to the required flow rate. Electronic balance constant temperature type than constant flow application more widely. Length is in commonly 0. 5 ~ 2 mm range, range from 1 to 10 microns in diameter, material for platinum, tungsten and platinum rhodium. If a piece of very thin ( The thickness is less than 0. 1 micron) Metal film instead of metal wire, is the hot film anemometer, function and hot wire are similar, but more for measuring the liquid flow rate. In addition to the ordinary single type, also can be a combination of double wire or 3 line, used to measure velocity component in all directions. From the output of the electrical signal, after amplification, compensation, and digital input computer, can improve the accuracy of measurement, automatic data processing process, expanding speed function, such as the completion of instantaneous value and at the same time average, speed and velocity, turbulence and other turbulence parameters measurement. Pitot anemometer, compared with pitot probe is small in size, little interference flow field; Fast response, to measure the unsteady flow speed; To measure very low speed ( Such as low as zero. 3 m/s) Wait for an advantage.
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