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1. Working principle of vortex flowmeter | Manufacturer interpretation
Vortex flowmeter is a flow measurement instrument designed based on the Karman vortex principle, mainly used for flow detection of gases, liquids, and steam in industrial pipelines. The core principle and working process are as follows:
1. Core principle: Karman vortex street effect. When the fluid flows through a non streamlined vortex generator (such as a triangular column), two regular vortices will alternately separate on both sides of the generator, forming Karman vortex streets. The release frequency (f) of the vortex is related to the fluid flow velocity (v) and the characteristic width of the generating body (d) as follows: f=Sr × (v/d), where Sr (Strouhal number) is a dimensionless constant that remains stable within a specific Reynolds number range (usually 2 × 10 ^ -7 × 10 ^ -2), ensuring a linear relationship between frequency and flow velocity. Figure 1: Schematic diagram of alternating vortices generated by fluid around a triangular column
Analysis of working process: When the fluid flows through the triangular column, vortices are alternately formed on both sides of the generating body due to pressure difference, and the strength of the vortices is proportional to the flow velocity.
. Frequency detection uses piezoelectric sensors, thermal sensors, or ultrasonic sensors to detect pressure fluctuations or flow rate changes caused by vortex shedding, and converts them into electrical signals. The frequency (f) of the pulse signal output by the signal processing sensor is directly related to the flow rate (v), and the flow rate is calculated by the following steps: Flow rate calculation: Obtain the average flow ra
III. Key technical features Wide measurement range: Reynolds number has a wide range of applications and can cover low flow velocity (0.3m/s) to high flow velocity (40m/s) scenarios. Stable accuracy: The Strouhal number (Sr) remains constant within a specific range, ensuring long-term measurement repeatability error of ≤± 0.5%. Strong anti-interference ability: The vortex frequency is only related to the flow velocity and is not affected by parameters such as temperature, pressure, and density (additional configuration is required when temperature and pressure compensation is needed). Simple structure: no mechanical moving parts, low maintenance cost, and a lifespan of over 10 years.
IV. Application Scenarios and Limitations Typical applications: Industrial pipelines: steam metering, compressed air monitoring, natural gas trade settlement.
. Environmental protection field: smoke emission monitoring, sewage treatment flow control. Energy industry: boiler feedwater flow measurement, cooling water circulation monitoring. Usage restrictions: Avoid containing large amounts of impurities or viscous substances in the fluid to prevent clogging of vortex generators. Sensitive to pipeline vibration, it is necessary to install shock absorbers or select anti vibration instruments. When the flow rate of the low signal stove is low (Reynolds number<2 × 10?), the vortex generation is u