Spiral vortex gas flowmeter| ultrasonic meter for gas

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1. What is the difference between a turbine and a vortex gas flowmeter?

The difference between vortex flowmeter and vortex flowmeter. Vortex flowmeter is a device that sets a stagnation piece in the flowmeter pipeline. When the fluid flows through the stagnation piece, two asymmetric vortices will be generated downstream due to the stagnation effect on the surface of the stagnation piece. These vortices will separate on the side and rear of the stagnation piece, forming a so-called Karman vortex column. The rotation direction of the two vortices is opposite. Karman theoretically proved that when h/l=0.281 (h is the width between two vortex columns, and l is the distance between two adjacent vortices), the vortex column is stable. In this case, the frequency of vortex generation The relationship between f and the fluid velocity υ in the flowmeter pipeline is: f=sv/dv=df/s, where d represents the diameter of the cylindrical stagnation component; S - dimensionless constant, called Strouhal number, related to the Reynolds number re of the fluid flow state. The Reynolds number re of a circular cross-section pipeline with a flow meter is: where υ - the flow velocity of the fluid, m/s； ρ - density of fluid, kg/m3； μ - dynamic viscosity of fluid, (kg?m-1)/s。 And the flow rate of the fluid: q=a * v can be seen from the above equation. After the selection and design of the vortex flowmeter, the flow rate q is not only related to f, but also to the Reynolds number re. The Reynolds number re is a dimensionless number that characterizes the flow characteristics of viscous fluids, and its physical meaning is the ratio of the inertial force to the viscous force of fluid flow. Therefore, the flow state of the fluid also has

a certain impact on the use of vortex flowmeters. If environmental parameters have an impact on the fluid flow state, it will also affect the performance of the vortex flowmeter. When the fluid flow sensor of the vortex flowmeter is fed along the axial direction, it is forced to rotate around the centerline under the action of the vortex generator, generating a vortex flow. The vortex flow rotates in the Venturi tube and reaches the contraction section where it suddenly throttles, accelerating the vortex flow. When passing through the diffusion section, the center of the vortex precesses along a conical spiral line. At this point, the precession frequency of the vortex center through the detection point is proportional to the flow velocity of the fluid. The precession frequency signal of the vortex flow detected by the piezoelectric sensor is amplified, filtered, and shaped before being converted into a flow value for on-site display or signal selection.

2. Tianxin TDS-200B Intelligent Spiral Flow Meter User Manual: [2]

The core content of the Tianxin TDS-200B Intelligent Spiral Flow Meter User Manual is as follows:

1. Product Overview Tianxin TDS-200B Intelligent Spiral Flow Meter is a flow measurement instrument designed based on the principle of spiral vortex, suitable for flow measurement of gases or liquids.

. Its core components include the precession generator, sensors, and intelligent processing unit, which achieve high-precision measurement by detecting the vortex frequency generated by the fluid.

2. Instructions for use: The flowmeter should be installed horizontally in the pipeline to avoid measurement errors caused by tilting or vertical installation.

. The installation locat

Spiral vortex gas flowmeter

1. What is the difference between a turbine and a vortex gas flowmeter?

2. Tianxin TDS-200B Intelligent Spiral Flow Meter User Manual: [2]

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