日本航空宇宙学会論文集
Online ISSN : 2432-3691
Print ISSN : 1344-6460
ISSN-L : 1344-6460
論文
平板に衝突する音速噴流の振動機構に関する数値解析
沖中 亮太松尾 亜紀子
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ジャーナル フリー

2001 年 49 巻 572 号 p. 316-321

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抄録

The unsteady flowfields of the sonic jet impinging on a flat plate are numerically investigated using the two-dimensional axisymmetric Euler equations. The characteristics of the jet oscillations qualitatively agree with the experimental results, and the mechanism of jet oscillation and the physical model of sound wave generation are discussed. The jet oscillations have the same period as the sound waves, because passing of sound waves around the nozzle exit causes oscillations of the jet itself. The mechanism of jet oscillations consists of sound waves passing and the vortex convection. In the mechanism, the time delay between the sound wave passing and the vortex occurrence at the nozzle lip is newly pointed out and corresponds to half wave length of the sound wave. A physical model including the time delay is newly suggested and well agrees with both computational and experimental results.

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© 2001 The Japan Society for Aeronautical and Space Sciences
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