细长杆降低超声速客机气动噪声的数值分析

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。

Numerical analysis of slender-rod-noise-reduction of supersonic passenger aircraft

The installation of an appropriately-shaped slender rod on the nose of supersonic passenger aircraft is able to reduce flight noise level.With the assistance of AUSM+ scheme of quasi-three-dimensional numerical simulation,a series of the 7 groups of 13 slender models are analyzed and compared to find the relations between near-field and far-field gas parameters.Furthermore,based on the theories of aerodynamics and shockwave,this paper explains the solutions of numerical simulation,and thus reveals the relation between the effect of noise-reduced and the shape of the appropriate slender rod;it also forms the empirical formulas between near field and far field gas parameters.Besides,this paper has selected some prior ones to make an analysis of the slender models in three-dimensional flow field,and has validated their structural strength through fluid-solid interaction so as to prove its feasibility.