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1. What is the principle of pitot tube (working principle of pitot tube flowmeter)
A pitot tube flowmeter is a double layered hollow frustum bent at a right angle, with multiple pressure tapping holes, which can simultaneously measure the total pressure and static pressure of the fluid. Used in conjunction with differential pressure transmitters and flow display devices. The L-shaped pitot tube is made up of two different straight stainless steel tubes that are concentric with each other. The inner tube has a straight end tail joint that is a full pressure tube, and the outer tube has a side joint that is a static pressure tube. The direction of the pointing rod is consistent with the head of the measuring rod, and the direction can be determined during use to align the measuring head with the direction of the incoming flow. The S-shaped pitot tube is made of two tubes facing away from each other, with the windward side being the full pressure end and the leeward side being the static pressure end.
1. Working principle of pitot tube flowmeter: There is a small hole called the total pressure hole opened in the upstream direction of the pitot tube head, which forms a "stagnation point". Several static pressure holes perpendicular to the fluid flow direction are opened at a certain distance from the head. The static pressure measured by each static pressure hole is output after being evenly distributed in the pressure equalization chamber. Since the difference between the total pressure and static pressure of the fluid has a certain numerical relationship with the flow velocity of the measured fluid, the flow velocity of the fluid can be measured using the pitot tube to calculate the size of the measured f
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2. Technical parameters of pitot tube: L-type pitot tube coefficient: between 0.99 and 1.01, S-type pitot tube coefficient: between 0.81 and 0.86. 1. Gas velocity measurement range: 2-70 meters/second. 2 Handle length: 0.1-3 meters 3. Fluid flow velocity range: 0.2-5 meters/second 4 Induction head diameter: 4mm-12mm
III. Purpose of pitot tube? In scientific research, production, teaching, environmental protection, purification rooms, mine ventilation, and energy management departments, pitot tubes are commonly used to measure pipeline wind speed and airflow velocity in furnace flues. After conversion, the flow rate is determined, and the water flow velocity in pipelines can also be measured. The use of pitot tubes for speed measurement and flow determination has a reliable theoretical basis, is convenient and accurate, and is a classic and widely used measurement method. In addition, it can also be used to measure the pressure of fluids.
4. Usage of Pitot Tube
1. It is necessary to correctly select the measurement point section and ensure that the measurement point is in a straight pipe section with smooth airflow.
. For this purpose, local components such as elbows and variable diameter pipes that measure the distance between the cross-section and the incoming flow direction should be greater than 4 times the diameter of the pipeline. Local bends and variable diameter structures in the downstream direction should be greater than twice the diameter of the pipeline. When measuring, the full pressure hole should be aligned with the direction of the airflow to indicate the direction of the rod. The insertion hole of the measuring point should avoid air leakage, which can prevent a
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