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在超声速客机机头加装适当的细长杆可以降低飞行噪声。本文借助基于AUSM+格式的准三维数值模拟手段对7组13种细长杆方案做了分析比较,总结出了近场气体参数与远场气体参数之间的关系的规律。文章还从气体动力学理论和激波理论出发,对数值模拟结果作了解释,并揭示了细长杆降噪效果与细长杆外形的内在联系,以及近场、远场两者关系的经验公式。文章从各种方案中选取了降噪效果较好的细长杆方案做三维流场分析,并通过流固耦合计算对其结构强度做了校核,验证了方案的可行性。
The installation of a suitable slender pole at the supersonic passenger aircraft nose can reduce flight noise. In this paper, based on the AUSM + quasi-three-dimensional numerical simulation of the means of 13 sets of slender rod program of 7 groups were analyzed and compared to sum up the near-field gas parameters and the relationship between the parameters of the far-field gas law. Based on the theory of gas dynamics and shock theory, the paper explains the numerical simulation results and reveals the intrinsic relationship between the slender rod’s noise reduction effect and the shape of the slender rod, as well as the experience of the relationship between the near-field and far-field formula. In this paper, we select the slender rod with better noise reduction from various schemes to do three-dimensional flow field analysis, and check the structural strength through the fluid-solid coupling calculation to verify the feasibility of the scheme.