P188.8.131.52 Ciśnienie statyczne w zmniejszonym przekroju. Pomiar ciśnienia za pomocą precyzyjnego manometru
P184.108.40.206 Określanie natężenia przepływu za pomocą rurki Venturiego. Pomiar ciśnienia za pomocą precyzyjnego manometru
The study of aerodynamics relies on describing the flow of air through a tube using the continuity equation and the Bernoulli equation. These state that regardless of the cross-section A of the tube, the volume flow and the total pressure remain constant as long as the flow speed remains below the speed of sound.
Note: In the experiments P220.127.116.11 - P18.104.22.168, the precision manometer is used to measure pressures. In addition to a pressure scale, it is provided with a further scale which indicates the flow speed directly when measuring with the pressure head sensor.
In the experiments P22.214.171.124 - P126.96.36.199 the pressure is measured with a pressure sensor and recorded using the universal measuring instrument Mobile-CASSY. In order to verify these two equations, the static pressure in a Venturi tube is measured for different cross-sections in the experiments P188.8.131.52 and P184.108.40.206. The static pressure decreases in the reduced
cross-section, as the flow speed increases here.
The experiments P220.127.116.11 and P18.104.22.168 uses the Venturi tube to measure the volume flow. Using the pressure difference Dp = p2 - p1 between two points with known cross-sections A1 and A2.
The experiments P22.214.171.124 and P126.96.36.199 aims to determine flow speeds. Here, dynamic pressure (also called the “pressure head”) is measured using the pressure head sensor after Prandtl as the difference between the total pressure and the static pressure, and this value is used to calculate the speed at a known density r.
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