Vortex flowmeter working principle analysis and selection guide
2024-07-16
Analysis of working principle of vortex flowmeter
Vortex flow meter is a kind of flow measuring instrument based on vortex effect principle, which is widely used in the industrial field of liquid, gas and steam flow measurement. Its working principle can be analyzed in detail as follows:
The generation of vortex effect
Vortex generator: The core component of a vortex flowmeter is a vortex generator, which is usually a sensor with a fixed shape and a pair of symmetrical spiral blades (or vortex generators) on the sensor.
Vortex shedding: When the flow time of the fluid through the vortex street, the kinetic energy of the fluid makes the blade produce periodic vortex shedding. These vortices form two rows of asymmetrical vortices downstream of the blade, known as Karman vortex streets. These vortices rotate in opposite directions and under certain conditions (e.g., h/L=0.281) form a stable array of vortices.
Measurement and conversion of vortex frequency
Piezoelectric sensors: Vortex flowmeters are equipped with piezoelectric sensors to measure the frequency of vortex shedding. When the vortex falls off, the piezoelectric sensor is affected by the vortex and produces a tiny vibration, which is converted into an electrical signal.
Signal processing: The electrical signal is further processed by the signal processor to convert the frequency signal into a standard flow signal. The processing process includes amplification, filtering and other operations to ensure the accuracy and stability of the signal.
Traffic display and recording
Display: The processed traffic signal is displayed on the display, and the user can visually see the current traffic value.
Recording and transmission: Traffic signals can also be recorded and transmitted through other devices to meet the requirements of different application scenarios.
The advantages of vortex flowmeter are its high measurement accuracy (up to 0.5%~1%), fast response speed, simple structure and easy maintenance. In addition, it can be combined with other sensors to measure the density and temperature of the fluid, as well as the valve and regulation functions of the fluid.
Vortex flowmeter selection guide
When selecting a vortex flow meter, a number of factors need to be considered to ensure that the appropriate measuring instrument is selected. Here are some key selection guidelines:
1. Working conditions
Medium type: Vortex flowmeter is suitable for gas, liquid and steam and other media. However, it should be noted that for media with excessive kinematic viscosity such as high-viscosity oils, vortex flowmeters may not be suitable.
Temperature and pressure: Select the right vortex flowmeter according to the temperature and pressure range of the medium. Under high temperature and high pressure conditions, it is necessary to choose a vortex flowmeter that is resistant to high temperature and high pressure.
2. Fluid properties
Density and viscosity: The density and viscosity of different media have different effects on the measurement characteristics of vortex flowmeters. Therefore, the actual physical properties of the medium need to be considered when selecting the vortex flow timing.
Compressibility: For gaseous media, its compressibility also has a certain impact on the measurement results of vortex flowmeters.
3. Precision requirements
Select the appropriate vortex flowmeter according to the accuracy requirements of the application scenario. High-precision vortex flowmeters are more expensive, but can provide more accurate measurement results.
4. Installation method and site environment
Installation method: Vortex flowmeter has a variety of installation methods (such as vertical installation, horizontal installation, etc.), you need to choose the appropriate installation method according to the field conditions.
Field environment: Consider the impact of vibration, temperature change, pipe diameter and length on the measuring accuracy and stability of vortex flowmeter.
5. Maintenance and after-sales service
Maintenance requirements: Vortex flowmeters need to be regularly maintained and calibrated during use to ensure their measurement performance and long-term stability. Therefore, when choosing a vortex flow meter, it is necessary to consider its maintenance requirements and after-sales service support.
Technical support: Choose the products of regular manufacturers, and fully communicate and exchange with manufacturers or suppliers to understand their product performance, technical support and after-sales service.
To sum up, by considering the working conditions, fluid properties, accuracy requirements, installation methods and site environment, as well as maintenance and after-sales service and other factors, you can choose a vortex flowmeter suitable for your working conditions.
If you want to know more about the flow meter or flow meter selection, please consult the Aister flow meter manufacturer email: sales@aistermeter.com for help.
Vortex flow meter is a kind of flow measuring instrument based on vortex effect principle, which is widely used in the industrial field of liquid, gas and steam flow measurement. Its working principle can be analyzed in detail as follows:
The generation of vortex effect
Vortex generator: The core component of a vortex flowmeter is a vortex generator, which is usually a sensor with a fixed shape and a pair of symmetrical spiral blades (or vortex generators) on the sensor.
Vortex shedding: When the flow time of the fluid through the vortex street, the kinetic energy of the fluid makes the blade produce periodic vortex shedding. These vortices form two rows of asymmetrical vortices downstream of the blade, known as Karman vortex streets. These vortices rotate in opposite directions and under certain conditions (e.g., h/L=0.281) form a stable array of vortices.
Measurement and conversion of vortex frequency
Piezoelectric sensors: Vortex flowmeters are equipped with piezoelectric sensors to measure the frequency of vortex shedding. When the vortex falls off, the piezoelectric sensor is affected by the vortex and produces a tiny vibration, which is converted into an electrical signal.
Signal processing: The electrical signal is further processed by the signal processor to convert the frequency signal into a standard flow signal. The processing process includes amplification, filtering and other operations to ensure the accuracy and stability of the signal.
Traffic display and recording
Display: The processed traffic signal is displayed on the display, and the user can visually see the current traffic value.
Recording and transmission: Traffic signals can also be recorded and transmitted through other devices to meet the requirements of different application scenarios.
The advantages of vortex flowmeter are its high measurement accuracy (up to 0.5%~1%), fast response speed, simple structure and easy maintenance. In addition, it can be combined with other sensors to measure the density and temperature of the fluid, as well as the valve and regulation functions of the fluid.
Vortex flowmeter selection guide
When selecting a vortex flow meter, a number of factors need to be considered to ensure that the appropriate measuring instrument is selected. Here are some key selection guidelines:
1. Working conditions
Medium type: Vortex flowmeter is suitable for gas, liquid and steam and other media. However, it should be noted that for media with excessive kinematic viscosity such as high-viscosity oils, vortex flowmeters may not be suitable.
Temperature and pressure: Select the right vortex flowmeter according to the temperature and pressure range of the medium. Under high temperature and high pressure conditions, it is necessary to choose a vortex flowmeter that is resistant to high temperature and high pressure.
2. Fluid properties
Density and viscosity: The density and viscosity of different media have different effects on the measurement characteristics of vortex flowmeters. Therefore, the actual physical properties of the medium need to be considered when selecting the vortex flow timing.
Compressibility: For gaseous media, its compressibility also has a certain impact on the measurement results of vortex flowmeters.
3. Precision requirements
Select the appropriate vortex flowmeter according to the accuracy requirements of the application scenario. High-precision vortex flowmeters are more expensive, but can provide more accurate measurement results.
4. Installation method and site environment
Installation method: Vortex flowmeter has a variety of installation methods (such as vertical installation, horizontal installation, etc.), you need to choose the appropriate installation method according to the field conditions.
Field environment: Consider the impact of vibration, temperature change, pipe diameter and length on the measuring accuracy and stability of vortex flowmeter.
5. Maintenance and after-sales service
Maintenance requirements: Vortex flowmeters need to be regularly maintained and calibrated during use to ensure their measurement performance and long-term stability. Therefore, when choosing a vortex flow meter, it is necessary to consider its maintenance requirements and after-sales service support.
Technical support: Choose the products of regular manufacturers, and fully communicate and exchange with manufacturers or suppliers to understand their product performance, technical support and after-sales service.
To sum up, by considering the working conditions, fluid properties, accuracy requirements, installation methods and site environment, as well as maintenance and after-sales service and other factors, you can choose a vortex flowmeter suitable for your working conditions.
If you want to know more about the flow meter or flow meter selection, please consult the Aister flow meter manufacturer email: sales@aistermeter.com for help.
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