Vanke Compressed Air Flow Meter Principle

Abstract: Vanke compressed air flow meter principle information is provided to you by excellent flow meter and flow meter manufacturers. LUGB series intelligent vortex flowmeter is mainly used for flow measurement of industrial pipeline medium fluid, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range, high precision, and is hardly affected by fluid density when measuring volume flow under working conditions. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the principle of Vanke compressed air flowmeter. LUGB series intelligent vortex flowmeter is mainly used for flow measurement of industrial pipeline medium fluid, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range, high precision, and is almost not affected by parameters such as fluid density, pressure, temperature, viscosity, etc. when measuring the volume flow of the working condition. No moving mechanical parts, so high reliability and low maintenance. Instrument parameters can be stable for a long time. This instrument adopts piezoelectric stress sensor, which has high reliability and can work in the working temperature range of -20℃～+250℃. There are analog standard signals and digital pulse signal outputs, which are easy to use with digital systems such as computers. It is a relatively advanced and ideal flow meter. ※Principle If a triangular column vortex generator is set in the fluid, regular vortices will be generated alternately from both sides of the vortex generator. This type of vortex is called Karman vortex. As shown in the figure on the right, the vortex row is asymmetrical downstream of the vortex generator. arranged in place. Suppose the frequency of vortex occurrence is f, the average flow velocity of the measured medium is , the width of the vortex generating body is d, and the diameter of the surface body is D, the following relationship can be obtained: f=SrU1/d=SrU/md (1 ) where U1--the average flow velocity on both sides of the vortex generator, m/s; Sr--Strouhal number; m--the ratio of the arcuate area on both sides of the vortex generator to the cross-sectional area of ​​the pipeline qv for qv=πD2U/4=πD2mdf/4Sr (2) K=f/qv=[πD2md/4Sr]-1 (3) in the formula K--meter coefficient of the flowmeter, the number of pulses/m3 (P/m3). In addition to the geometric dimensions of the vortex generator and the pipe, K is also related to the Strouhal number. The Strouhal number is a dimensionless parameter, which is related to the shape of the vortex generator and the Reynolds number. Figure 2 shows the relationship between the Strouhal number of the cylindrical vortex generator and the Reynolds number of the pipeline. It can be seen from the figure that at ReD=2×104～7×Within the range of 106, Sr can be regarded as a constant, which is the normal working range of the instrument. When measuring the gas flow, the flow calculation formula of VSF is (4) Figure 2. The relationship between the Strouhal number and the Reynolds number. volume flow under the condition, m3/h; Pn, P--respectively the absolute pressure under the standard state and working condition, Pa; Tn, T--respectively the thermodynamic temperature under the standard state and working condition, K; Zn, Z--are the gas compressibility coefficients under standard state and working conditions, respectively. It can be seen from the above formula that the pulse frequency signal output by the VSF is not affected by changes in the physical properties and components of the fluid, that is, the instrument coefficient is only related to the shape and size of the vortex generator and the pipeline within a certain Reynolds number range. However, as a flowmeter, it needs to detect mass flow in material balance and energy measurement. At this time, the output signal of the flowmeter should monitor the volume flow and fluid density at the same time. The physical properties and components of the fluid have a direct impact on the flow measurement. Vortex flowmeter is a new type of flowmeter that measures fluid flow in closed pipelines based on the Karman vortex principle. Because of its good medium adaptability, it can directly measure the volume flow of steam, air, gas, water and liquid under working conditions without temperature and pressure compensation. Equipped with temperature and pressure sensors, it can measure the volume flow and mass flow under standard conditions. An ideal alternative to the type flowmeter. In order to improve the high temperature resistance and anti-vibration performance of the vortex flowmeter, our company has recently developed the HLUG improved vortex flow sensor.≤1g) under severe working conditions. In practical applications, the maximum flow rate is often much lower than the upper limit value of the instrument. With the change of load, the minimum flow rate is often lower than the lower limit value of the instrument. The instrument is not working in its optimal working section. In order to solve this problem One problem is that the diameter of the measuring place is usually reduced to increase the flow rate at the measuring place, and a smaller diameter meter is used to facilitate the measurement of the meter, but this method of reducing diameter must have a length of more than 15D between the reducing tube and the meter. The pipe section is rectified, which makes processing and installation inconvenient. The LGZ variable diameter rectifier developed by our company with a circular arc in the longitudinal section has multiple functions of rectifying, increasing the flow velocity and changing the flow velocity distribution. , not only does not need to add another straight pipe section, but also can reduce the requirements for the straight pipe section of the process pipe, and the installation is very convenient.

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