Steam Vortex Flow Meter | Relevant Parameters of Steam Vortex Flow Meter

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1. Working principle of vortex type steam flowmeter

The vortex type steam flowmeter measures the volumetric flow rate by detecting the regular vortex frequency generated when the fluid flows through a blunt body, combined with the linear relationship between Strouhal number and fluid velocity. The specific working principle is as follows: a blunt body induces vortex generation vortex flowmeter by placing a nonlinear blunt body (such as a triangular column or cylinder) inside the pipeline. When steam and other fluids flow through a blunt body, they are affected by surface friction and changes in pipe cross-sectional area, causing the fluid to form periodic shedding vortices at the tail of the blunt body. Uneven distribution of flow velocity and pressure on both sides of a blunt body: the side with higher flow velocity has lower pressure, while the side with lower flow velocity has higher pressure. The fluid in the high-pressure zone moves towards the low-pressure zone, resulting in the alternating generation of vortices. Figure: Linear relationship between vortex shedding frequency and flow velocity driven by pressure difference on both sides of a blunt body. Under stable operating conditions, the vortex shedding frequency (f) and the average fluid flow velocity (u), blunt body diameter (d), and Strouhal number (Sr) satisfy the formula: f=(Sr × u)/d. Among them, the Strouhal number (Sr) is a dimensionless constant determined experimentally and remains stable within a specific Reynolds number range. Since Sr is not affected by fluid density, the vortex frequency is only proportional to the flow velocity, so the flow velocity can be calculated by detecting the frequency. By combining the calculation of volumetric

flow rate with the cross-sectional area of the pipeline (A), the volumetric flow rate (Q) can be expressed as: Q=A × u=(A × d × f)/Sr. Since A, d, and Sr are all constant values, the volumetric flow rate is proportional to the vortex frequency. By counting the number of vortex shedding times per unit time, the flow rate value can be directly obtained. Key features and limitations advantages: Large range ratio, suitable for high flow rate scenarios in steam systems; No moving parts, long lifespan and low flow resistance; The structure is simple and the forest cover has low maintenance costs. Disadvantages: At low flow rates (usually below 5 m/s), vortices cannot be stably generated, resulting in low or zero readings; High flow rates (such as 80-100 m/s) may cause measurement errors due to steam humidity or impurities; The installation requirements are strict, avoiding interference from gaskets, welding slag, etc., and requiring a long straight pipe section (usually 15-20 times the diameter of the pipe) upstream to eliminate flow disturbances; Vibration environment may cause frequency detection errors. Application scenarios: Vortex type steam flow meters are widely used in industrial steam metering, thermal pipelines, and energy management systems, especially suitable for steam transportation scenarios that are sensitive to flow resistance and have high flow rates.

2. Relevant parameters of steam vortex flowmeter

◆ Measurement medium: gas, liquid, steam ◆ Diameter specification: flange card type caliber selection: 25, 32, 50, 80, 100 ◆ Flange connection caliber selection: 100, 150, 200 ◆ Flow measurement range: normal measurement flow rate range: Reynolds number 1.5 × 104~4 × 106; Gas velocity of 5-50m/s; T

Steam Vortex Flow Meter | Relevant Parameters of Steam Vortex Flow Meter

1. Working principle of vortex type steam flowmeter

2. Relevant parameters of steam vortex flowmeter

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