METHOD TO MEASURE SPEED OF DIRECTED FLOW OF LIQUID OR GAS Russian patent published in 2015 - IPC G01P5/10 

FIELD: measurement equipment.

SUBSTANCE: to measure speed of a directed flow they use a primary measuring converter of marks in a flow with an evenly distributed measuring base of available length L, the measuring base is installed in a flow at the available sharp angle α to the flow direction, the output signal R(t) of the primary measuring converter is supplied via the secondary measuring converter to a spectrum analyser, using the available method, they calculate the current function of the spectral density of signal S_R(f) for the time T. Since the distributed primary measuring converter performs sliding averaging on the base L and in the time interval $$$ of the signal of marks in the flow, the function S_R(f) will have minima (zeroes) at discrete frequencies f_i in the ascending order $$$ , besides (ƒ₁-ƒ_i-1)L=V_α. Frequencies f_i are determined according to the function S_R(f), the average speed of the flow $$$ for the time T is calculated according to the formula $$$ . When marks in the flow are irregularities of temperature, coefficient of heat exchange (depending on pulsations of speed, density, heat capacity, heat conductivity, kinematic viscosity of the flow), pulsations of hydrostatic pressure, irregularity of specific electric conductivity, coefficients of attenuation of light and sound - they use appropriate distributed primary measuring converters of marks into an electric signal.

EFFECT: increased accuracy, simplified technical realisation of the method to measure speed of a flow and expansion of application areas.

1 cl, 17 dwg