METHOD OF MEASURING SPEED OF FLUID IN STATIONARY AND TRANSIENT MODES Russian patent published in 2007 - IPC G01P5/12 G01F1/68 

FIELD: measuring technique.

SUBSTANCE: method can be used for measuring speed of single-phase flow of fluid in stationary and transient modes. Method is based upon measurement of temperature of fluid by means of thermocouple speed meter. Sensitive element of thermocouple speed meter is heated by ac source and temperature of warmed-up sensitive element is measured; difference between temperatures is measured afterwards. Speed of fluid is measured on the base of preliminary achieved dependence ΔT_se=T_w-T_f=f(W), where T_w is temperature of sensitive element measured at turned-on ac source, T_f is temperature of fluid measured by means of thermocouple speed meter when ac source is turned off, W is speed of fluid. Sensitive element of thermocouple speed meter is subject to heating periodically. Temperature of warmed sensitive element of thermocouple speed meter is measured within time intervals, which correspond to turned-on ac source; temperature of fluid is measured by means of thermocouple speed meter within time intervals corresponding to turned-off ac source. Turning-on of source of heating of ac source is performed at the moment when voltage of ac source is minimal. Time interval of heating of thermocouple meter is chosen from condition of t_r<Δt_w<t_pr, where Δt_w is time interval corresponding to warming of thermocouple speed meter, t_pr is specific time of tested process during which process the speed of fluid is determined, and t_r is time of taking of readings of thermocouple speed meter.

EFFECT: improved precision of measurement of fluid flow's speed.

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