Do you know the application of Karman vortex flowmeter in lead-bismuth alloy

After having a thorough understanding of the working principle of the vortex flowmeter is the Karman principle, in this article, the editor will talk to you in detail about the specific application of the Karman vortex flowmeter in lead-bismuth alloys. The vortex flowmeter uses the Karman vortex principle. A vortex generator is set in the pipeline. The fluid flows in a directional flow in the pipeline. The fluid flow is hindered by the vortex generator, and the layers on both sides rotate in opposite directions and are regularly arranged. the double row vortex (Figure 2). The flow velocity v of the fluid is proportional to the frequency f generated by the vortex, and the relationship between the two is as formula (2): vu003dSt/fd(2). In the formula: v is the fluid velocity; f is the vortex frequency; d is the characteristic width of the vortex generator; St is the Strouhal constant. The premise of using the Karman vortex street to measure the flow velocity is that two stable vortex trains need to be staggered on both sides of the generating body, and the formation of stable vortex trains is related to the flow velocity and Reynolds number of the fluid. When the fluid Reynolds number is in the range of 60≤Re≤5×103, Strouhal is a fixed constant included in the calculation, and the vortex formation is stable. When the flow velocity is higher than a certain value or lower than a certain value, so that the Reynolds number is not within the above range, and the Strouhal constant is constant, a stable vortex cannot be formed, the Reynolds number is not proportional to the average flow velocity, and formula (2) does not hold. , cannot be measured by this method. Due to the specific physical and chemical properties of lead-bismuth alloy, the kinematic viscosity of lead-bismuth alloy is very small, and at lower flow rates, therefore, the flowmeter using the Karman vortex principle can only be tested for flow rates with lower flow rates. When using this method for testing, it is also necessary to consider the influence of the shape of the vortex generator on the formation of the vortex row. At present, there are many types of generators such as cylindrical, square, triangular column, etc., which are selected according to the stability of the vortex row and the characteristics of the fluid. I hope I can help you in the above content, and if you want to know more about flowmeters, please log in to the official website of Kaidi Instruments at any time for inquiries.

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