METHOD FOR DETERMINING THE FLOW RATE OF A MEDIUM IN ROUND PIPES AT BALANCED FLOW Russian patent published in 2016 - IPC G01F1/00 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measurement equipment and is intended for determining the flow rate of a medium in round pipes at balanced flow. Method for determining the flow rate in pipelines involves measurement of the flow rate at two characteristic points along the section area of the pipe and determination of the flow rate on the basis of these measurement results. Distinctive feature of the method is that the medium flow rate at any point of the flow along the section area of the pipe is measured; using the integrated universal logarithmic profile U=A_kln(x)+B_k the values of A_k and B_k coefficients are determined for each pair of known values of coordinates (distances from the pipe wall) of the points of rate measurement and the measured rate values at these points (, ) and (, ), relative differences between the values of coefficients of A_k and B_k are determined and (upper indices mean the values of A_k and B_k coefficients, calculated for various pairs of coordinate-rate values), provided that the values and for each pair of values of A_k and B_k do not exceed the preset value ε, heat carrier flow rate is determined using the formula:

,

where r=r₀-x - distance from the centre of the pipe; r₀ is the radius of the pipe; x is the distance from the pipe wall; is the average value of A_k coefficients; is an average of B_k coefficients ; n=3; κ is the karman constant; ν - kinematic viscosity of the medium; δ_in -thick sublayer thickness.

EFFECT: technical result is increase of accuracy.

1 cl, 1 dwg, 1 tbl