A summary is provided for the Second AIAA Sonic Boom Workshop held 8-9 January 2017 in conjunction with AIAA SciTech 2017. The workshop used three required models of increasing complexity: an axisymmetric body, a wing body, and a complete configuration with flow-through nacelle. An optional complete configuration with propulsion boundary conditions is also provided. These models are designed with similar nearfield signatures to isolate geometry and shock/expansion interaction effects. Eleven international participant groups submitted nearfield signatures with forces, pitching moment, and iterative convergence norms. Statistics and grid convergence of these nearfield signatures are presented. These submissions are propagated to the ground, and noise levels are computed. This allows the grid convergence and the statistical distribution of a noise level to be computed. While progress is documented since the first workshop, improvement to the analysis methods for a possible subsequent workshop are provided. The complete configuration with flow-through nacelle showed the most dramatic improvement between the two workshops. The current workshop cases are more relevant to vehicles with lower loudness and have the potential for lower annoyance than the first workshop cases. The models for this workshop with quieter ground noise levels than the first workshop exposed weaknesses in analysis, particularly in convective discretization.
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机译:2017年1月8日至9日举行的第二次AIAA Sonic Boom研讨会提供了一份摘要。研讨会使用了三种所需的模型增加了复杂性:轴对称体,机翼体和具有流通的完整配置机舱。还提供了具有推进边界条件的可选的完整配置。这些型号的设计具有类似的近场签名,以隔离几何和冲击/扩展交互效果。 11个国际参与者团体提交了近场签名,带有力量,投球时刻和迭代融合规范。介绍了这些近场签名的统计和电网融合。这些提交将传播到地面,并且计算噪声水平。这允许计算噪声水平的电网收敛和统计分布。虽然自第一个研讨会以来,虽然在第一讲习班以来进行了进度,但提供了对可能的后续研讨会的分析方法的改进。通过流通机舱的完整配置显示了两个研讨会之间最戏剧性的改进。目前的研讨会案件与响度较低的车辆更相关,并且具有比第一个研讨会案件更低的烦恼的潜力。该研讨会的型号,具有比第一研讨会更安静的地面噪声水平暴露在分析中的弱点,特别是在对流离散化方面。
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