| 横向扰动对超声速混合层被动标量混合影响分析 |
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| 引用本文： | 冯军红,沈赤兵.横向扰动对超声速混合层被动标量混合影响分析[J].国防科技大学学报,2016,38(2):48-55. |
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| 作者姓名： | 冯军红 沈赤兵 |
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| 作者单位： | 国防科技大学 高超声速冲压发动机技术重点实验室,国防科技大学 高超声速冲压发动机技术重点实验室 |
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| 基金项目： | 国家自然科学基金资助(11272351,11572346) |
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| 摘 要： | 采用大涡模拟数值计算二维空间发展的超声速混合层,重点分析横向扰动对混合层的标量结构、标量厚度以及标量体积卷吸率的影响。采用理论模型验证了数值方法在计算标量混合特性方面的准确性。结果表明,横向扰动频率和振幅明显影响着混合层的标量增长率和卷吸率。高频扰动增大了混合层近场标量增长率和卷吸率,但是低频扰动改善了混合层远场标量增长率。大尺度涡卷吸过程对混合层标量卷吸率起决定作用。多频扰动有效地增强了超声速混合层的标量混合。
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| 关 键 词： | 横向扰动 超声速混合层 被动标量 动量比 卷吸率 |
| 收稿时间： | 2015/9/24 0:00:00 |
Effect of transverse forcing on passive scalar mixing in supersonic mixing layer |
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| FENG Junhong and SHEN Chibing.Effect of transverse forcing on passive scalar mixing in supersonic mixing layer[J].Journal of National University of Defense Technology,2016,38(2):48-55. |
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| Authors: | FENG Junhong and SHEN Chibing |
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| Abstract: | Numerical studies on a spatially developing supersonic mixing layer are performed by means of large-eddy simulation, focusing on the effect of transverse forcing on the passive scalar mixing characteristic of mixing layer. The results for the baseline case without external forcing are in agreement with the analytical evidence. Afterwards, the effect of forcing frequency and amplitude on the scalar structure, scalar thickness and volumetric entrainment ratio of mixing layer are analyzed. Results indicate that transverse forcing alters the passive scalar mixing characteristics significantly. High-frequency forcing magnifies the scalar thickness and volumetric entrainment ratio in the near field of mixing layer. However, in the far field the growth rate is increased by the low-frequency forcing. The entrainment ratio is, to large extent, dominated by the large-scale eddy entrainment process. The multiple-frequency forcing seems to a valid method to enhance scalar mixing in supersonic mixing layer. |
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| Keywords: | transverse forcing supersonic mixing layer passive scalar momentum ratio entrainment ratio |
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