Abstract
A new model for Ultrasonic Cross Correlation Flow Meters (USCCFM) has been developed as result of industrial experience at Ontario Power Generation (OPG). Industrial applications of USCCFM have encountered cases where the frozen pattern model failed. The new model is based on the mathematical properties of turbulent velocity fields and correlation functions. It contains a proof that USCCFM measurement in a particular situation is successful, if and only if certain mathematical conditions are satisfied. In this document, the term “successful” means that the USCCFM is able to obtain a consistent cross correlation peak, and a stable time delay from the flow condition; otherwise the measurement is considered unsuccessful. This model applies to all measurement conditions encountered so far.
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