Pitot tube

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A Pitot tube (also called a pitot probe) is a flow measurement instrument that calculates fluid velocity by measuring pressure differences in a moving fluid. It is most widely known for measuring airspeed on aircraft, but is also used in many industrial, marine and motorsport applications.

Key moments

1732French engineer Henri Pitot invents and describes the original L-shaped prototype to measure water flow velocity in the Seine River.
19th centuryThe design is refined to measure both total stagnation pressure and static pressure, creating the modern pitot-static configuration used today.

Core Working Principle

The Pitot tube is based on Daniel Bernoulli's fluid mechanics principle. Basic versions only measure total (stagnation) pressure through an opening facing directly into the flow, while modern pitot-static tubes add separate perpendicular openings to measure static ambient pressure. The difference between these two values equals dynamic pressure, which is used to solve for fluid flow velocity using Bernoulli's equation.

Aviation Safety Significance

Pitot tubes are a critical safety component for all aircraft, as they provide the airspeed data that pilots depend on for flight control. Blockages caused by ice, insect nests, or debris can lead to incorrect speed readings, which have caused multiple fatal aviation accidents. This risk led to the industry-wide adoption of electrically heated Pitot tubes to prevent ice blockage and redundant multiple sensor systems on modern commercial aircraft.

Cross-Field Applications

Beyond aviation, Pitot tubes are widely used in other areas: they measure water velocity for boats, monitor fluid flow rates in industrial pipes, measure ventilation airflow in mines and tunnels, and are even used in high-performance motorsports like Formula 1 to collect aerodynamic and vehicle speed data. Their simple, reliable design has kept them in common use for nearly 300 years.

A pitot tube (also pitot probe) measures fluid flow velocity. It was invented by French engineer Henri Pitot during his work with aqueducts and published in 1732,[1] and modified to its modern form in 1858 by Henry Darcy.[2] It is widely used to determine the airspeed of aircraft;[3] the water speed of boats; and the flow velocity of liquids, air, and gases in industry.

Theory of operation

The basic pitot tube consists of a tube pointing directly into the oncoming fluid flow. Pressure in the tube can be measured as the moving fluid cannot escape and stagnates. This pressure is the stagnation pressure of the fluid, also known as the total pressure or (particularly in aviation) the pitot pressure.

The measured stagnation pressure cannot just by itself be used to determine the fluid flow velocity (airspeed in aviation) directly. However, with a measured static pressure as well it can be determined by the use of Bernoulli's equation, which states:

Pitot tube

WorldBrand briefing

Core Working Principle

Aviation Safety Significance

Cross-Field Applications

Theory of operation

Aircraft and accidents

Other applications

See also

External links

References