H2020 ENODISE: DLR Analytical Aeroacoustic Database BLI Configuration A1 and A2

This database contains the acoustic prediction results of DLR for a single operating point of the A1 and A2 configurations investigated in the framework of the European project ENODISE. In these configurations, a single two-bladed propeller is immersed in a boundary layer. The present results can be compared to the measurements carried out by the University of Bristol and the University of Twente for different boundary layer characteristics. The experimental results are saved elsewhere on the ZENODO repository. The investigated operating point as calculated in the prediction is: Uinf = 33 m/s, 6500 rpm, advance ratio J=1. The experimental measurements were conducted at a slightly lower freestream velocity. The DLR prediction results were obtained using the analytical approach implemented in the DLR in-house program PropNoise coupled to the blade element momentum theory. The calculations were informed by the hot-wire measurements carried out in the boundary-layer as the propeller was removed. Refer to the two references cited below to obtain more information about the theory that was applied to obtain the results: S. Guérin, T. Lade, L. Castelucci, I. Zaman, Tonal noise emission by a low-Mach low-Reynolds number propeller ingesting a boundary layer, 29th International Congress on Sound and Vibration, 10-13 July 2023, Prague (CZ). S. Guérin, T. Lade, L. Castelucci, I. Zaman, Broadban noise emission by a low-Mach low-Reynolds number propeller ingesting a boundary layer, Inter-Noise 2023, 20-23 August 2023, Chiba (Great Tokyo), Japan. The results for tonal and broadband noise are saved separately. The DLR results are saved into an h5 file, which can be read with e.g. python. Further details can be found in the file <em>DLR_documentation_A1_A2.pptx</em>本数据库包含德国航空航天中心（DLR）针对欧洲项目ENODISE框架下研究的A1、A2两种构型的单个工况所开展的声学预测结果。上述两种构型均采用单组双叶螺旋桨，使其浸没于边界层流场中。本数据集所得结果可与布里斯托大学（University of Bristol）以及特文特大学（University of Twente）针对不同边界层特性开展的实验测量结果进行比对。相关实验结果已上传至ZENODO知识库的其他存储路径。本次预测所采用的研究工况参数如下：来流速度Uinf=33 m/s，转速6500转每分钟，进距比J=1。对应实验测量的来流速度略低于该值。DLR的声学预测结果通过其自研程序PropNoise中集成的分析方法结合叶素动量理论（blade element momentum theory）计算得到。该计算基于移除螺旋桨后在边界层内开展的热线测量数据进行校准。如需了解本次研究所用理论的更多细节，请参阅如下两篇参考文献：S. Guérin、T. Lade、L. Castelucci、I. Zaman：《吸入边界层的低马赫数低雷诺数螺旋桨纯音噪声辐射》，第29届国际声学与振动大会，2023年7月10日-13日，布拉格（捷克共和国）；S. Guérin、T. Lade、L. Castelucci、I. Zaman：《吸入边界层的低马赫数低雷诺数螺旋桨宽频噪声辐射》，2023年国际噪声控制工程大会（Inter-Noise 2023），2023年8月20日-23日，千叶（大东京地区），日本。纯音噪声与宽频噪声的计算结果分别存储。DLR的预测结果存储于h5（HDF5）格式文件中，可通过Python等工具读取。更多细节可参阅文件<em>DLR_documentation_A1_A2.pptx</em>。