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How nose bluntness suppresses second-mode growth

机译：鼻子钝化如何抑制二型生长

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A physical mechanism by which nose bluntness suppresses second-mode instability is proposed. Considered are 7 degree half-angle straight cones with nose bluntnesses of 0.006", 0.2", 0.375", 0.5", 1" and 2" at tunnel conditions relevant to the Arnold Engineering Development Complex (AEDC) Hypervelocity Wind Tunnel 9. It is shown that second-mode suppression is achieved via entropy layer modulation of the basic state density gradient. A weakening of the density gradient disrupts the acoustic resonance necessary to sustain second-mode growth. These results are consistent with the thermoacoustic interpretation which posits that second-mode instability can be modeled as thermoacoustic resonance of acoustic energy trapped within an acoustic impedance well. Furthermore, the generalized inflection point criteria of Lees and Lin is applied to develop a criteria for the existence of second-mode instability based on the strength of the basic state density gradient.
机译：提出了一种鼻钝抑制第二种模式不稳定性的物理机制。在与Arnold工程开发综合体（AEDC）超高速风洞9有关的隧道条件下，考虑了鼻子钝度为0.006“，0.2”，0.375“，0.5”，1“和2”的7度半角直锥。图1示出了通过基本状态密度梯度的熵层调制来实现第二模式抑制。密度梯度的减弱会破坏维持第二模态增长所需的声共振。这些结果与热声解释相一致，后者认为，可以将第二模态不稳定性建模为捕获在声阻抗井中的声能的热声共振。此外，基于基本态密度梯度的强度，应用Lees和Lin的广义拐点判据来开发第二模态不稳定性的判据。

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