Zhengzhou Vortex Flow Meter | Working Principle of Vortex Steam Flow Meter

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1. Specifications and models of flow meters

Common specifications and models of different types of flow meters are summarized as follows

1. Vortex flow meter models cover different media and flow scenarios, including FS series for industrial gas measurement and micro vortex flow meters for small flow detection

1 mm to several meter caliber

4. Mass flow meters, taking the HH series as an example, are divided according to the nominal diameter of the pipeline.

6、DN

10、DN1

5、DN2

5、DN40、DN50、DN80、DN100（ Unit: mm) There are a total of 8 specifications for physical flow meters. Taking EXAIRs 9090 model as an example, it is compatible with 1/2 "to 8" Schedule 40 iron pipes and 25mm to 101mm aluminum pipes, and can support up to 4 "copper pipe air flow measurement. • Vortex/Swirl Vortex Flowmeters: including the conventional DN20-DN200 Swirl Vortex Flowmeters from Astra Instruments and the LUGB series from Chongqing Chuanyi. Ultrasonic flow meters: such as Emerson FLUXUS G721 CA clamp type, Astra ATLS clamp type, and other models.

2. Actual flow rate of vortex flowmeter

The flow formula measured by vortex flowmeter is qv=π D2U/4=π D2mdf/4Sr K=f/qv=[π D2md/4Sr] -1. Under specific flow conditions, a part of the fluid kinetic energy is converted into fluid vibration, and the vibration frequency of the vortex flowmeter is proportional to the flow rate (flow rate). A flowmeter that works based on this principle is called a fluid vibration flowmeter.

. At present, there are three types of fluid vibration flow meters: vortex street flow meters, vortex precession flow meters, and jet flow meters. Fluid vibration flowmeter has the following characteristics: 1) T Zhengzhou Vortex Flow Meter

he output is a pulse frequency, which is proportional to the actual volumetric flow rate of the measured fluid and is not affected by fluid composition, density, pressure, or temperature; 2) The measurement range is wide, and the general range can reach 10:1 or more; 3) The accuracy is above average level; 4) No movable parts, high reliability; 5) The structure is simple and sturdy, easy to install, and has low maintenance costs; 6) Widely applicable, suitable for liquids, gases, and vapors. The working principle is to set up a vortex generator (blocking fluid) in the fluid, and generate regular vortices alternately from both sides of the vortex generator. This type of vortex is called a Karman vortex street, as shown in Figure 1. The vortices are arranged asymmetrically downstream of the vortex generator. Assuming the frequency of vortex occurrence is f, the average velocity of the measured medium flow is U, the width of the vortex generator face is d, and the diameter of the body is D. According to the principle of Karman vortex street, there is a relationship f=SrU1/d=SrU/md. The vortex generator is the main component of the detector, which is closely related to the flow characteristics (instrument coefficient, linearity, range, etc.) and resistance characteristics (pressure loss) of the instrument. It is required that: 1) the vortex can be controlled to separate synchronously in the axial direction of the vortex generator; 2) Within a wide range of Reynolds numbers, there are stable vortex separation points, and maintaining a constant branch state results in the Strouhal number; 3) Can generate strong vortex streets, with a high signal-to-noise ratio of the signal; 4) The shape and structure are simple, easy to proce

Zhengzhou Vortex Flow Meter | Working Principle of Vortex Steam Flow Meter

1. Specifications and models of flow meters

2. Actual flow rate of vortex flowmeter

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