This paper focuses on the radiation noise of a rod-airfoil configuration based on a high-order cell-centered finite difference method (CCFDM) and Ffowcs Williams-Hawkings (FW-H) acoustic analogy. To reduce numerical dissipation and dispersion, a class of optimized compact schemes is firstly proposed and then validated with benchmark cases from computational aeroacoustic workshops. For turbulence, the delayed detached eddy simulation (DDES) with Spalart-Allmaras model is adopted and is validated through a canonical periodic hill problem. For the far-field radiated acoustics, the FW-H acoustic analogy is utilized with validation of laminar flow past NACA0012. Finally, a rod-airfoil configuration is investigated. The results show reasonable agreement with the experimental data in terms of both near-field aerodynamics and far-field acoustics. The interaction between the upstream turbulence wake from the rod and the downstream airfoil is evidenced to be the dominant contributor to the far-field noise.

本文重点研究基于高阶单元中心有限差分法（CCFDM）和Ffowcs Williams-Hawkings（FW-H）声学模拟的杆翼型构型的辐射噪声。为了减少数值耗散和色散，首先提出了一种优化的紧凑型方案，然后用计算航空声学研讨会的基准案例进行了验证。对于湍流，采用了具有Spalart-Allmaras模型的延迟分离涡模拟（DDES），并通过典型的周期山问题进行了验证。对于远场辐射声学，FW-H声学类比用于验证流经NACA0012的层流。最后，对杆翼型构型进行了研究。结果表明，在近场空气动力学和远场声学方面，实验数据均与实验数据合理吻合。