抄録
To obtain the specific values of uncertainty of flowrate measurement using the ultrasonic Doppler velocity profile (UVP) method under disturbed flow conditions, experimental measurements are carried out. To generate the disturbed flow, obstacle plates are installed upstream of the test section. In order to estimate which experimental parameter is a dominant factor of the uncertainty, the parametric examinations are carried out for the obstacle plate layout, the distance between them and measurement section, the incident angle of the ultrasonic beam, and flowrate. Since several uncertainty factors are cross-correlated each other in this examination, uncertainties of these factors are evaluated independently using an analysis of variance, namely ANOVA. The total uncertainty is 7.98% at 8D, 1.97% at 16D and 1.14% at 25D, respectively.
