Summary

Description

An innovative research program is proposed that numerically and physically models the response of resonator liners to intense sound and high speed grazing flow. The research program is divided into two parts. Part 1 addresses the feasibility of performing direct numerical simulation (DNS) of the sound and flow fields of the following: (i) one-slit and two-slit resonators in a normal incidence impedance tube, (ii) adjust and modify the computational algorithm and mesh design to allow the code to perform high temperature simulations, and (iii) use the simulation codes to initiate a study of the performance of high temperature liners. Part 2 develops the following: (iv) a grazing flow multi-slit orifice resonator impedance model, (v) a grazing flow 1-dof multi-circular orifice resonator impedance model and (vi) a 2-dof non-grazing flow multi-circular orifice resonator impedance model. The research program was motivated, in part, by high oil prices that place ever greater demands upon the near-term need to provide aircraft engine acoustic engineers with reasonably accurate tools to design optimized liners and the long-term need to develop sophisticated computational codes to provide physical understanding of the interaction between incident intense sound and grazing flow on resonator liners