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What is a pitot?

Date: 2021-12-24 00:58
Views: 16
Abstract: pitot tube, also known as pitot tube and total static pressure tube, is a device to measure the total pressure and static pressure of air flow around the aircraft during flight, and transmit the measured atmospheric pressure data such as static pressure and total pressure to the atmospheric data computer and flight instruments in the cockpit. We can see that there is a small hole at the front end of the pitot. In fact, it is composed of two concentric tubes. The inner tube is the total pressure tube and the outer tube is the static pressure tube. When the aircraft flies forward, the air flows into the small hole in the front of the pitot tube, and the sensor installed at the end of the tube can feel the force of the airflow impact - this is actually a pressure sensor, and the pressure felt is called dynamic pressure. The faster the aircraft flies, the greater the impact of air flow, the greater the dynamic pressure. At this time, the static pressure of the air at rest is compared with the dynamic pressure, and the pressure difference can be obtained.

What is? Pitot ?- Working principle of pitot


Download technical data of heated pitot, L-type pitot, straight handle pitot, standard pitot and front strut pitot

 

Pss-8 pitot with straight handle               Ftb-1 angle of attack sensor sideslip angle sensor pitot system

            

Adp-55 five hole pitot | angle of attack sensor | sideslip angle sensor system            Hps-1 heated pitot

What is a pitot? What is the working principle of pitot? How does the pitot measure altitude and airspeed? Pitot It is also called pitot tube, total static pressure tube, etc. it is a device to measure the total pressure and static pressure of air flow around the aircraft during flight, and transmit the measured atmospheric pressure data such as static pressure and total pressure to the atmospheric data computer and flight instruments in the cockpit. We can see that there is a small hole at the front end of the pitot. In fact, it is composed of two concentric tubes. The inner tube is the total pressure tube and the outer tube is the static pressure tube. When the aircraft flies forward, the air flows into the small hole in the front of the pitot tube, and the sensor installed at the end of the tube can feel the force of the airflow impact - this is actually a pressure sensor, and the pressure felt is called dynamic pressure. The faster the aircraft flies, the greater the impact of air flow, the greater the dynamic pressure. At this time, the static pressure of the air at rest is compared with the dynamic pressure, and the pressure difference can be obtained.

Pitot The measured speed is not the real speed of the aircraft relative to the ground, but only the speed relative to the surrounding atmosphere, so it is called airspeed. If there is wind, the speed of the aircraft relative to the ground (called ground speed) should be added with the wind speed (flying along the wind) or minus the wind speed (flying against the wind). It is also a pitot in front of the nose radome, but it shortens the length of the pitot by taking advantage of the installation position. Although the pitot technology is a mature and widely used atmospheric data measurement technology, Pitot Until now, it is still an important means of measuring aircraft airspeed.

In the early days, the pitot was gun type, which was set in front of the nose fairing, so it was also called "wind vane"; Later Pitot It is generally set at the side of the nose behind the fairing of the fighter. There are also vertical tails or wings. The reason why the pitot is set in these positions is that in order to ensure the accuracy of the measured airflow data and the small disturbance, the installation position must be in the area outside the aircraft where the airflow is less affected by the aircraft. In order to ensure the accuracy of static and dynamic pressure data, at least two sets of pitot should be prepared. But it must be pointed out that the speed measured by the pitot tube and displayed by the airspeed meter, It is not the speed of the aircraft relative to the ground (i.e., the so-called ground speed), but the speed of the aircraft relative to the atmosphere (i.e., the so-called airspeed). The ground speed and airspeed are the velocity of the air through the addition and subtraction of the atmosphere Even at the same airspeed, due to the different atmospheric density, the dynamic pressure measured by the pitot tube at the same flight speed is not the same at low altitude and high altitude. For the same airspeed, the airflow is thinner in the high altitude, and the dynamic pressure measurement value is lower, so the value displayed by the airspeed meter is lower; in the low altitude air density is high, the dynamic pressure measurement value is higher, because This airspeed meter displays a higher value, so the airspeed value read on the airspeed meter is also called "gauge speed".







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