论文标题
高超音速前沿扫荡的接受性和稳定性在钝体周围流动
Receptivity and stability of hypersonic leading-edge sweep flows around a blunt body
论文作者
论文摘要
这项研究对超声波扫描的全球稳定性/接受度分析在无限范围内的钝体周围流动。我们首次获得了领先的附件模式的特征，以从20度到70度的扫角变化。全球本征函数表现出领先边缘的依恋线不稳定性的特征。同时，跨流（在小扫角）或第二个Mack模式（在较大的扫描角度上）以进一步的下游主导。我们建立了一个基于伴随的双组征本函数系统，以解决此类流向任何外部力和边界扰动的接受性问题。接受性分析表明，无论扫描角度如何，全局模式对在附件附近的外部力和表面扰动最有响应。还可以证明，可以成功地应用于复杂的流动，目前双组本本函数系统的全球扩展。
This study performs global stability/receptivity analyses of hypersonic sweep flows around a blunt body with an infinite span. For the first time, we obtain the characteristics of the leading attachment-line mode to the variation of sweep angles from 20 to 70 degrees. The global eigenfunctions exhibit the characteristics of the attachment-line instability at the leading edge. At the same time, cross-flow (at small sweep angles) or second Mack mode (at larger sweep angles) dominates further downstream. We establish an adjoint-based bi-orthogonal eigenfunction system to address the receptivity problem of such flows to any external forces and boundary perturbations. The receptivity analyses indicate that the global modes are the most responsive to external forces and surface perturbations applied in the vicinity of the attachment line, regardless of the sweep angles. It is also proved that the present global extension of the bi-orthogonal eigenfunction system can be successfully applied to complex flows.
