Orientation of temperature and pressure measurement of vortex flowmeter

The vortex flowmeter measures the temperature and pressure of the port position. The vortex flowmeter uses the stable vortex generated when the fluid flows through the vortex generator. By measuring the frequency of the vortex generation, the volume flow rate is obtained. Experiments have pointed out that no matter the fluid flowing through the vortex generating body is liquid, gas or vapor, only the Reynolds number is 2×104〜Within the range of 7^106, a stable flow coefficient can be obtained. The test also pointed out that the frequency of vortex occurrence reflects the uniform flow velocity of the fluid at the vortex occurrence body, and the product of this flow velocity and the flow cross-sectional area is the volume flow rate. To convert this volume flow of steam into mass flow, it is essential to measure the hydrostatic pressure at the vortex generator. The static pressure here is lower than the fluid pressure in the upstream pipeline of the vortex flowmeter due to the high fluid flow rate. It is difficult to accurately measure the static pressure here due to various reasons, but on the pipeline downstream of the flowmeter for a certain distance, the static pressure measured at the same or close to the static pressure at the sensor behind the generator is A possible solution. According to Yokogawa's requirements, this suitable interval is 3.5〜7.5 times the inner diameter of the pipe. According to the needs of 2+8 companies, the appropriate interval is 3-5 times the inner diameter of the pipe from the downstream flange of the flow sensor.

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