| The objective of this thesis is to develop an analytical 1-D linear turbulence model to analyze acoustic wave propagation in the fluid-filled pipes. This work, which comprises an analytical study only, is built upon the concept of turbulence boundary layer behaviour under the imposed frequency disturbances. A two-region linear time-invariant turbulence eddy viscosity model for rough-walled pipe is employed. A transfer function is then obtained for the high mean Reynolds number turbulent flows. In addition, a formula to calculate the volumetric drag coefficient of the turbulent pipe flow has also been developed.; The experiments of the outlet feeder of the STERN Loop at a temperature of 60.6 degrees are applied to verify the proposed model with other five models. The simulation results show that the resonant amplitude predictions using the current two-region linear turbulence model agree well with the experimental data. Accordingly, the present turbulence model provides a methodology for the computation of the turbulence volumetric drag used in the ABAQUS acoustic analysis. The development of the formula eliminates the uncertainty in choosing the values of the volumetric drag used in the ABAQUS, or the transfer matrix method for analyzing the nuclear reactor acoustics. |
