Vortex flowmeter generator | Sewage Doppler flowmeter

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1. Please briefly describe the measurement principle of vortex flowmeter.

[Answer]: Insert a non streamlined object cylinder (vortex generator) vertically into the fluid. When the flow velocity reaches a certain value, two columns of opposite rotation directions will be formed on the downstream sides of the stove opening cylinder Alternating vortices. These two columns of vortices are called Karman vortex streets. When certain collapse conditions are met, the vortex street is stable and proportional to the flow velocity. By measuring the frequency cone roundness of the vortex street, the flow velocity of the fluid can be obtained, and then the volumetric flow rate can be obtained.

2. Working principle of vortex flowmeter

The working principle of vortex flowmeter is based on the Karman vortex phenomenon for flow measurement.

. The following is a detailed explanation of its working principle: The vortex flowmeter is mainly composed of a vortex generator, a detection probe, and corresponding electronic circuits. When a fluid flows through a vortex generator (such as a cylinder), two alternating rows of vortices are formed on both sides, which are called Karman vortex streets. The formation of Karman vortex street is an important phenomenon in fluid dynamics, which manifests as a series of ordered and alternately arranged vortices on both sides of an obstacle when the fluid passes over it. The frequency of vortex separation is directly proportional to the flow velocity of the sluggish fluid and inversely proportional to the width of the vortex generator. This relationship can be represented by a specific formula, where the vortex separation frequency f, dimensionless constant St (Strouhal number Vortex flowmeter generator

), average fluid velocity V in the pipeline, upstream face width d of the cylinder, and inner diameter D of the sensor housing are all key parameters that affect the measurement results. The Strouhal number St is a function of the Reynolds number Re for a specific type of vortex in a certain flow range. The linear part of the St and Re functions is the linear measurement range of the vortex flow sensor. By detecting the separation frequency of these vortices, the flow velocity and instantaneous flow rate of the fluid can be measured. Specifically, when the vortex alternately separates on both sides behind the cylinder, pressure pulsation is generated, which causes the detection object (also known as the probe) in the sensor to be subjected to alternating force. The piezoelectric crystal components embedded in the detection body will generate charge frequency signals when subjected to alternating forces. After being processed by the detection circuit, this signal can be output in the form of a frequency signal or converted into a standard signal. The number of pulses generated by a unit volume of fluid flowing through a sensor is called the instrument coefficient K. By measuring the number of pulses N and the fluid volume Q, the instrument coefficient K can be calculated to further determine the fluid flow rate. In addition, the vortex flowmeter can also be used together with the matching flow integrator and temperature and pressure sensors to correct and calculate the measurement parameters, in order to improve the accuracy and reliability of the measurement. In summary, the working principle of a vortex flowmeter is to utilize the Karman vortex phenomenon to measure the flow velocity and flow rate of a fluid by detectin

Vortex flowmeter generator | Sewage Doppler flowmeter

1. Please briefly describe the measurement principle of vortex flowmeter.

2. Working principle of vortex flowmeter

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