Some Aspects of Interpreting Two-Phase Flow Measurements in Instrumented Piping Spool Pieces,

摘要

A discussion is presented of factors affecting the determination of two-phase mass flow rate and quality,using data from instrumented piping spool pieces such as those of the ORNL Thermal Hydraulics Test Facility. Steady-state air-water data were correlated with separated flow models which included three different turbine models. Results showed little difference in the quality up to 30%; a model which weighted phase velocities according to void fraction was not representative of the data. A model is presented for the dynamics of a turbine rotor in transient two-phase flow. The analysis showed that mechanical inertia of the rotor was less than the angular velocity. An analysis is presented of effects of axial separation of instruments on the determination of mass flow.