| 液滴超声速气动破碎初期界面不稳定性 |
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| 作者姓名： | 胡湘渝 AdamsN.A. 王强 |
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| 作者单位： | 1.慕尼黑工业大学机械工程学院，加兴 85748 |
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| 摘 要： | 针对液滴破碎问题，获得并揭示两相界面演化特征机理.采用数值模拟方法，观察了超声速条件下的液滴气动破碎初期的界面不稳定性.基于数值模拟结果和线性稳定性理论，综合分析表明，Rayleigh-Taylor不稳定性和Kelvin-Helmholtz不稳定性均对源于驻点和外环之间中段附近处的主导扰动产生作用.保持其他流动特性不变，降低K-H不稳定性的影响，对数值模拟进行了专门改进，进一步验证了前述结论.
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| 关 键 词： | 气液界面 不稳定性 WENO格式 破碎 激波 |
| 收稿时间： | 2018-05-17 |
Early-Time Interface Instabilities in Supersonic Aero-Breakup of Liquid Drop |
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| Institution: | 1.Faculty of Mechanical Engineering, Technical University of Munich, Garching 85748, Germany2.China Academy of Aerospace Aerodynamics, Beijing 100074, China |
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| Abstract: | The liquid drop breakup problem was introduced to obtain and reveal the evolving property and mechanism of its two-phase interface. The early-time interface instabilities in supersonic aero-breakup of a liquid drop were investigated by numerical simulations. A combined analysis based on simulation results and linear-instability theory shows that both R-T (Rayleigh-Taylor) and K-H (Kelvin-Helmholtz) instabilities contribute the dominant disturbances originated from about the half way from the stagnation point to the equator. This is verified further with a specially modified simulation, which decreases the effect of K-H instability while keeps other flow properties unchanged. |
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