VORTEX MEASUREMENT METHOD OF FLOWING SUBSTANCE VOLUME Russian patent published in 2013 - IPC G01F1/32 

FIELD: measurement equipment.

SUBSTANCE: in the measuring channel of the substance amount counter, a regular sequence of vortexes is created, each vortex is recorded in the form of an electric pulse, current frequency values of pulse sequence f, as well as medium temperature and pressure are measured. Current value of kinematic substance viscosity v is calculated by an indirect method: for liquid - as per temperature, for gas or steam - as per temperature and pressure. Roshko number is calculated as per the formula: Ro=h²·f/v, where h - width of bluff body. Substance volume ΔW per pulse is calculated for each pulse separately using the current value of Strouhal number Sh as per the formula: ΔW=K_G/Sh, where K_G- geometrical factor determined for example as a product of width of bluff body h and cross sectional area of the measuring channel in its narrowest section (πd⁴/4-hd). Current value Sh is calculated by adding the current value of Reynolds number Re to the relationship Sh(Re) obtained at calibration of the counter in the operating range of values Re. Current value Re is calculated as per formula: Re=-b+Ro/a, where a and b - coefficients of approximating dependence Sh=a·(1+b/Re). Flowing substance volume W is determined by the following formula: where N - total number of pulses recorded during the measurement.

EFFECT: improving measurement accuracy in the whole range of operating values of Reynolds number.

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