What are the requirements of the turbine flowmeter for the measured medium? Posted by : admin / Posted on : Feb 22， 2022

Turbine flowmeter is a kind of speedometer, which has the characteristics of high precision, good repeatability, simple structure, high pressure resistance, wide measurement range, small volume, light weight, small pressure loss, long service life, simple operation and convenient maintenance. , can be widely used in petroleum, chemical, metallurgy, organic liquid, inorganic liquid, liquid gas, city gas pipeline, medicine, food, paper and other industries. Therefore, what are the requirements of the liquid turbine flowmeter for the measured medium?

Rotary flowmeters are generally only suitable for low-viscosity single-phase fluids.
In practical applications, by testing the turbine flowmeter, it is found that the instrument coefficient hardly changes with the flow rate when the turbine flowmeter measures low-viscosity medium. When the viscosity of the measured medium increases, the instrument coefficient is very linear. In addition, the instrument coefficient varies greatly with the flow rate, so it is difficult to achieve the specified measurement accuracy. When the test medium is a gas-liquid two-phase flow, the flow velocity of the medium is extremely unstable, resulting in a large measurement error.

The medium fluid measured by the liquid turbine flowmeter should be in a turbulent state.
By analyzing the flow characteristics of the turbine flowmeter, it is found that when the medium is in laminar flow state, the instrument coefficient changes greatly with the flow rate, but when the medium is in turbulent flow state, the instrument coefficient hardly changes with the flow rate. In order to ensure the measurement accuracy of the liquid turbine flowmeter, the flow of the measured medium should be in a turbulent state.

Liquid turbine flowmeters are generally only used to measure media with high cleanliness.
Most of the current liquid turbine flowmeters use spherical bearings, which have high requirements for the cleanliness of the measured medium. If there are impurity particles in the medium, the bearing will wear quickly, and if there are fiber impurities, it will be wrapped around the turbine blades, affecting the normal operation of the turbine. In practice, an effective screen should be installed upstream of the turbine flowmeter.

Most of the current liquid turbine flowmeters use spherical bearings, which have high requirements for the cleanliness of the measured medium. If there are impurity particles in the medium, the bearing will wear quickly, and if there are fiber impurities, it will be wrapped around the turbine blades, affecting the normal operation of the turbine. In practice, an effective screen should be installed upstream of the turbine flowmeter.