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高速钝锥对不同类型来流扰动的三维感受性研究

万兵兵 胡伟波 李晓虎 黄文锋 陈坚强 涂国华

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高速钝锥对不同类型来流扰动的三维感受性研究

万兵兵, 胡伟波, 李晓虎, 黄文锋, 陈坚强, 涂国华

Three-dimensional receptivity of a high-speed blunt cone to different types of freestream disturbances

Wan Bing-Bing, Hu Wei-Bo, Li Xiao-Hu, Huang Wen-Feng, Chen Jian-Qiang, Tu Guo-Hua
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  • 来流扰动感受性是边界层转捩的起始阶段,能够决定边界层扰动以何种路径触发转捩。目前二维感受性研究较为充分,但现实来流扰动往往以非零角入射,导致空间扰动在圆锥周向上存在分量,造成感受性呈现三维特征,该问题研究偏少。前期仅研究了低频慢声波入射的三维感受性,对于不同类型扰动的三维感受性问题还未作系统性研究。本文采用高精度三维数值模拟技术和线性稳定性理论,开展有入射角的不同频率快/慢声波、熵波和涡波的钝锥三维感受性研究。结果发现,入射慢声波能够激发边界层第一和第二模态;快声波很难激发不稳定模态;熵波和涡波在低频条件下难以激发第一模态,但在高频下可激发第二模态。扰动入射角可造成感受性因周向位置而异,体现在:一主导扰动形式的差异;二边界层扰动幅值的差异。不同扰动类型、频率下这种差异表现出不一样的规律,入射正面、背面和侧面都有可能是最强感受性。导致这些现象可能是上游头部和入射正面扰动的共同作用结果。
    Receptivity to freestream disturbances is the initial stage of the boundary-layer transition process, which can determine the final path of boundary-layer disturbance triggering transition. At present, researches on the receptivity of two-dimensional boundary layer to disturbances with zero incident angles, are relatively sufficient. In fact, the freestream disturbances often propagate into the boundary layer in the form of non-zero incident angles, resulting in a component of spatial disturbances in the circumferential direction of rotating bodies (such as a cone). It is a receptivity problem with a distinct three-dimensional feature. However, research on this three-dimensional receptivity problem is relatively scarce. The preliminary work only studied the three-dimensional receptivity to low-frequency incident slow acoustic waves. There has not been a systematic study on the three-dimensional receptivity to different types of freestream disturbances. The paper conducts a study on the three-dimensional receptivity of a blunt cone to different freestream disturbances. Firstly, a high-resolution numerical simulation method is used to compute the three-dimensional receptivity process by introduce freestream disturbances with 15 degree incident angles. The freestream disturbances include fast acoustic wave, slow acoustic wave, entropy wave, and vortex wave. Their frequencies are selected as dimensionless 1.1 and 5, corresponding to the frequencies of the first mode and second mode, respectively. Then, the phase velocity and shape function of the boundary-layer disturbances at each circumferential position for the numerical results are obtained by Fourier transform. To interpret the receptivity mechanisms, the corresponding results by linear stability analysis are obtained for comparisons. It is found that, the first and second modes of the boundary layer can be effectively excited by the incident slow acoustic waves; It is difficult for the incident fast acoustic waves to excite unstable modes in the boundary layer; The incident entropy wave and vortex wave are difficult to excite the first mode at low frequency, but can excite the second mode at high frequency. Furthermore, the incident angle of the freestream disturbances can cause the differences in the receptivity at different circumferential positions of the cone, which can be reflected in two ways. One is the difference in the dominant disturbance form at different circumferential positions; The second is the difference in the amplitude of boundary-layer disturbances. Under different disturbance types and frequencies, these differences between different circumferential positions exhibit different results. The strongest receptivity may occur on the incident front, the incident back, and the incident side. These phenomena may be the result of the combined action of the upstream head disturbances and the disturbances on the incident front.
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