METHOD AND DEVICE FOR DETERMINING INSTANTANEOUS MASS FLOW RATE DURING PULSATED FLOW Russian patent published in 2011 - IPC G01F1/88 G01F1/72 G01F15/06 

FIELD: physics.

SUBSTANCE: differential pressure in a stream is measured using two piezoelectric pressure sensors. Pressure gradient existing in the stream during one period (P) is determined. Harmonic amplitude of the pressure gradient is calculated via a Fourier transform. Frequency f and time t are converted to dimensionless number F, τ, and mass flow rate is determined using conversion tables which define the relationship between the value F and values ψ_n and Δθ_n, which characterise mass flow rate, where ψ_n is the amplitude factor of dimensionless mass flow rate, Δθ_n is the phase difference between fluctuations of the pressure gradient and mass flow rate for the n-th harmonic component of mass flow rate by reading from said table for each number F of frequency f of corresponding values ψ_n, Δθ_n, which describe instantaneous mass flow rate for the obtained pressure gradient.

EFFECT: invention increases accuracy of determining mass flow rate by enabling continuous measurement with time resolution using a reliable and cheap device, having apparatus for determining pressure gradient and a computer.

24 cl, 8 dwg