Talking about the advantages and limitations of the vortex flowmeter

Abstract: Talking about the advantages and limitations of vortex flowmeters The information is provided to you by excellent flowmeter and flowmeter manufacturers. The working principle of the vortex flowmeter is to set a vortex generator in the fluid, so that regular vortices are alternately generated on both sides of the generator, and the vortex columns are arranged asymmetrically downstream of the vortex generator to generate a certain frequency. St*v/(1-1.27d/D). More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article discussing the advantages and limitations of vortex flowmeters. The working principle of the vortex flowmeter is to set a vortex generator in the fluid, so that regular vortices are alternately generated on both sides of the generator, and the vortex columns are arranged asymmetrically downstream of the vortex generator to generate a certain frequency. St*v/(1-1.27d/D)*d, (St is the Strouhal number, which is a dimensionless number and is related to the vortex generator and Reynolds number; v is the flow velocity; d is the oncoming width of the generator; D is the nominal diameter) to get the flow rate. In general, the output signal (frequency) of the vortex flowmeter is not affected by changes in the physical properties and components of the fluid, which means that the meter coefficient is only related to the shape and size of the vortex generator and the Reynolds number. Its advantages are: simple and firm structure, easy installation and maintenance; suitable for various types of fluids, such as liquid, gas, steam and some mixed phases; high accuracy, generally up to±About 1%R; wide flow range, up to 10:1 or 20:1 or more; small head loss; no zero drift; relatively cheap price; disadvantages are: not suitable for low Reynolds number Re<20000 The use of high viscosity, low flow rate, and small diameter is limited; the requirements for the environment are high, and places with vibration should be avoided as much as possible, and a long straight pipe section is required on the upstream side; the instrument coefficient is low, and the larger the diameter, the lower. The signal resolution is reduced, so the aperture should not be too large, generally used in DN15~DN300mm. 1. Advantages VSF has a simple and firm structure, and is easy to install and maintain (compared with throttling differential pressure flow meters, it does not require pressure guiding pipes and three-valve groups, etc., reducing leakage, blockage and freezing, etc.). Suitable for many types of fluids, such as liquids, gases, vapors and partially miscible fluids. The accuracy is high (compared with differential pressure type and float type flowmeter), generally the measured value (±1%～±2%), the pressure loss is small (about 1/4 to 1/2 of the orifice flowmeter). The output pulse signal proportional to the flow rate is suitable for total metering without zero drift; within a certain range of Reynolds number, the output frequency signal is not affected by the physical properties (density, viscosity) and composition of the fluid, that is, the meter coefficient is only related to the vortex The shape and size of the generator and the pipeline are related, and it only needs to be verified in a typical medium and is suitable for various media. 2. The limited VSF is not suitable for low Reynolds number measurements (ReD≥2×104), so the application is limited in the case of high viscosity, low flow rate and small caliber. The stability of the vortex separation is affected by the flow velocity distribution distortion and the swirling flow. According to the different forms of blocking elements on the upstream side, a long enough straight pipe section or a flow regulator (rectifier) ​​should be installed. Generally, the throttling differential pressure flow can be used for reference. The measured straight pipe length requires installation. Compared with the turbine flowmeter, the instrument coefficient is lower, the resolution is lower, and the larger the diameter, the lower the diameter. Generally, the full-tube flowmeter is used for DN300 or less. The instrument lacks theoretical research and practical experience in pulsating flow and mixed-phase flow. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'A Brief Discussion on the Advantages and Limitations of Vortex Flow Meters'

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