This paper presents an end-to-end approach for the assessment of pressurized and cryogenic wind tunnel measurements of an EMBRAER scaled full model close to real-world Reynolds numbers. The choice of microphones, measurement parameters, the design of the array, and the selection of flow parameters are discussed. Different wind tunnel conditions are proposed which allow separating the influence of the Reynolds number from the Mach number, as well as the influence of slotted and closed test sections. The paper provides three-dimensional beamforming results with CLEAN-SC deconvolution, the selection of regions of interest, and the corresponding source spectra. The results suggest that slotted test sections have little influence on the beamforming results compared to closed test sections and that the Reynolds number has a profound, non-linear impact on the aeroacoustic emission that lessens with increasing Reynolds number. Further, sources show a non-linear Mach number dependency at constant Reynolds number but are self-similar in the observed Mach number range. The findings suggest that it is possible to study real-world phenomena on small-scale full models at real-world Reynolds numbers, which enable further investigations in the future such as the directivity of sources.

翻译：本文提出一种端到端方法，用于评估EMBRAER缩比全模型在接近真实雷诺数下的增压与低温风洞测量。讨论了麦克风选型、测量参数、阵列设计以及流动参数选择。提出了不同的风洞条件，以分离雷诺数与马赫数的影响，以及开槽与闭口试验段的影响。本文给出了基于CLEAN-SC反卷积的三维波束成形结果、感兴趣区域选取及对应的声源频谱。结果表明，与闭口试验段相比，开槽试验段对波束成形结果影响甚微；而雷诺数对气动声学辐射具有显著的非线性影响，且该影响随雷诺数增大而减弱。此外，在恒定雷诺数下，声源表现出马赫数的非线性依赖性，但在观测马赫数范围内具有自相似性。研究结果表明，在接近真实世界雷诺数条件下，可通过小尺度全模型研究实际现象，这为未来进一步开展声源指向性等研究提供了可能。