Evaluation of a time-linearized Navier-Stokes method for booster tone noise analyses

A computational study of booster tone noise was performed using a linearized-unsteady Navier-Stokes solver in a proprietary computational fluid dynamics code. A model-scale fan rig geometry that was studied experimentally was chosen for this investigation to evaluate the ability of the linearized-unsteady methodology to predict booster tone noise. The predicted in-duct sound power levels were compared to sound power levels calculated from sideline traversing microphone data. The comparison indicates that the simulation is able to capture trends in booster tone noise along Approach, Cutback, and Sideline operating points and also the relative significance of the 1 and 2 booster harmonics.