a definition, pitot tube pitot tube, also known as pitot tube, wind pipe, pitot tube measurement of total pressure and static pressure airflow to determine air velocity of pipe shaped device, by the French H. Pitot invented the name. Strictly speaking, pitot tube flow are measured total pressure, also known as total pressure tube; Measure the total pressure, static pressure at the same time just say wind pipe, but traditionally called wind tube pitot tube.

2, pitot main use in scientific research, production, teaching, environmental protection, and tunnel, mine ventilation, energy management, commonly used pitot tube measurement of ventilation pipes, industrial piping, furnaces flue gas velocity, after conversion to determine the flow rate, measurement of flow velocity in the pipe. With pitot speed and determine traffic, according to have reliable theory, easy to use, accurate, is a classic wide measuring method. The structure of the pitot tube as shown in figure, the head of hemispherical, after a double casing. Speed measuring head alignment to flow, when the head center holes ( Total pressure hole) Feelings to flow, total pressure p0, the inner tube sent to pressure gauge. Head after about 3 ~ 8 d coat evenly open a hole on the wall, Static pressure hole) , feeling coming flow static pressure p, the casing is also to pressure gauge. For incompressible flow, according to the Bernoulli equation and energy equation can be calculated Mach number, and then seek speed. But in supersonic flow, the pitot head appeared in vitro shock, total pressure hole feelings is a wave after total pressure, static pressure to flow is also difficult to measure, thus pitot no longer apply. Total pressure hole has a certain area, it is all the feelings of the stationary point near the average pressure, slightly below the total pressure, static pressure hole feelings also have certain error of static pressure, and other such as manufacturing, installation, also can have error, so to measure the velocity should be added when a correction coefficient. Value is in commonly 0. 98-1. 05 range, in the air of known speed correction or correction of standard pitot tube and determined. Pitot tube structure is simple, easy to use and quite useful. As the plane or the wing leading edge often furnish pitot head, measure the relative speed of air, also called pitot tube.

other USES for three, pitot tube pitot tube in addition to used to measure speed, but also has other functions. In scientific research, production, teaching, environmental protection, and tunnel, mine ventilation, energy management, commonly used pitot tube measurement of ventilation pipes, industrial piping, furnaces flue gas velocity, after conversion to determine the flow rate, measurement of flow velocity in the pipe. With pitot speed and determine traffic, according to have reliable theory, easy to use, accurate, is a classic wide measuring method. In addition, it also can be used to measure the pressure of the fluid.

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