EXPERIMENTAL STUDY OF THE IMPACT OF THE TEMPERATURE FIELD INHOMOGENEITY ON METROLOGICAL PERFORMANCES OF THE ULTRASONIC FLOWMETER
The influence of non-isothermal flow of water on the metrological characteristics of the ultrasonic flowmeter was studied. Nonisothermic flow created by injecting a small amount of heated water in the vicinity of the test flowmeter. Experiments have shown that the presence of the temperature field inhomogeneity leads to an additional uncertainty volume flow rate, which depends on the temperature difference and the ratio of injected preheated flow to main stream. Injecting preheated stream leads to low-frequency fluctuations in the readings of the ultrasonic flowmeter, which are caused by fluctuations of the temperature profile.