自由扰动入射角对高超声速钝锥三维感受性的影响研究

边界层转捩问题是飞行器设计需要考虑的一个重要因素，感受性作为转捩过程的第一个阶段，决定着边界层不稳定波的初始幅值等关键信息。目前对这个问题的研究仍不够充分，其中对自由环境扰动的三维感受性更是缺乏足够的认识，使得无法准确获得边界层的转捩信息。风洞中的自由环境扰动一般具有入射角，试验研究实际存在三维感受性问题。本项目将采用三维DNS、扰动与激波作用的理论分析、LST和PSE等方法，细致开展自由扰动波如声波、熵波和涡波的入射角对高超声速钝锥边界层三维感受性的影响研究，揭示自由扰动激发边界层不稳定波的整个感受性过程的机理、规律和特征，包括自由扰动与激波的作用机理、钝锥各子午面边界层的三维感受性机理和特征、多种入射扰动共同作用的感受性机制、以及入射角的影响规律，解决模型三维空间的初始信息问题，从而为优化转捩预测方法提供合理的指导。

Boundary-layer transition is an important factor to be considered in aircraft design. Receptivity, as the first stage of transition process, which determines the initial amplitude and other key information of boundary-layer unstable waves, is still insufficiently studied. Especially, the three-dimensional receptivity to freestream environmental disturbances is lack of enough understanding, which makes it difficult to accurately obtain the boundary-layer transition information. The freestream environmental disturbances in wind tunnel generally have an incident angle, which results in a three-dimensional problem in receptivity experiment. This project will adopt some methods including three dimensional DNS, the interaction theory of disturbances and shock, LST and PSE to study the effect of the incident angles of freestream disturbances such as acoustic wave, entropy wave and vorticity wave on three-dimensional receptivity of blunt cone boundary layer. The effort is made to reveal the mechanism, regularity and characteristics including the interaction mechanism of freestream disturbances and shock, the three-dimensional receptivity mechanism and characteristics of different blunt cone meridional profiles, the receptivity mechanism of multiple incident disturbances and the influence regularity of incident angle, and solve the initial information of the three-dimensional model space, so as to provide reasonable guidance for optimizing the transition prediction methods.