Spatial dependence of turbine meter response in two-phase flow, MPE-547

This report deals with the extension of the momentum exchange turbine model to consider explicitly the spatial distributions of phase velocities and void fraction. It provides quantitative estimates of the uncertainties introduced by such spatial distributions for both axisymmetric and asymmetric profiles. More specifically, the report includes an assessment of the uncertainties introduced in the turbine response in single-phase flow by changes in the velocity distribution from that in which the turbine was calibrated. It also examines turbine performance in annular and dispersed two-phase flow regimes. Interpretations of the turbine response with two-phase flows are given both in terms of the mass weighted fluid velocity mentioned above, as well as the volume weighted (mean) fluid velocity. The major parameters which set local fluid conditions in the annular and dispersed regimes - void fraction and velocity profiles, as well as vapor phase drift flux - are exercised to assess the resulting uncertainty in interpreting turbine meter response. The reduction in calibration factor uncertainty brought about by certain turbine design features - blade twist and increased hub diameter - are also quantified. By a somewhat more simplified analysis, the turbine meter response in stratified flow is assessed