Measurement of mean flow and turbulence structure in an axisymmetric pipe flow with high initial shear

The paper describes an experimental study of the interaction between the time mean and turbulence properties in an axisymmetric pipe flow with particularly severe initial distortion. Every term in the time-meaned continuity equation and the more important turbulence contributions to the axial and radial momentum equations have been determined. The use of pressure probes and hot wire anemometry under these adverse flow conditions has necessitated a careful study of the experimental errors inherent in the measurements. Consideration of the equations of motion enables certain interesting relationships between the mean flow and the turbulence structure to be derived: these expressions are confirmed by the data.